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Chilean journal of agricultural research

On-line version ISSN 0718-5839

Chilean J. Agric. Res. vol.74 no.1 Chillán Mar. 2014

http://dx.doi.org/10.4067/S0718-58392014000100011 

RESEARCH

Indications that some nutritional elements can improve gladiolus corm and cormel qualities in Mexico

 

Enrique González-Pérez1*, Óscar Javier Ayala-Garay2, and María de Jesús Yánez-Morales2

1Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, Campo Experimental Bajío, km 6,5 Carretera Celaya-San Miguel de Allende, Celaya, Guanajuato. 38110. Guanajuato, México. *Corresponding author (González.enrique@inifap.gob.mx; yanezmj@colpos.mx).
2Colegio de Postgraduados, Campus Montecillo, km 36,5 Carr. México-Texcoco. C.P. 56230 Montecillo, Texcoco, México.


In regions of the State of Puebla (Mexico), gladiolus (Gladiolus grandiflorus Andrews) production has had asexual propagation problems, which have caused losses for producers, who mostly produce their own vegetative seeds. The aim of this study was to evaluate some physical qualities and health characteristics of corms and cormels generated at four fertilization rates (FD, kg ha-1): 65N-14.9P-171K-16.6Mg-31.2Ca-0.0B-0.0S (FD1); 40.5N-24P-171K-23Mg-37.2Ca-0.2B-8.5S (FD2); 81N-24P-171K-23Mg-37.2Ca-0.2B-0.0S (FD3); and 81N-24P-171K-23Mg-37.2Ca-0.0B-0.0S (FDR; traditional regional rate). Two hundred and forty corms, along with their cormels, of two varieties ('Borrega Roja' and 'Espuma') produced at four FDs were harvested. The following physical qualities of corms were assessed; corm fresh weight (CFW), number of cormels generated (NcMC), and total fresh weight (TFW); evaluated physical qualities of cormels were size (mm) and total weight. Cormel health was analyzed in 160 randomly disinfested pieces that were plated in agar medium with or without splitting. The percentage of identified fungus incidence was recorded. Data were analyzed by a non-parametric one-way ANOVA. No significant differences were shown for CFW. The best treatments were mainly FD2 followed by FD1. In relation to FD-R, FD2 in both varieties increased NcMC by 31% to 69%, TFW by 27% to 46%, 6-8 size by 24% to 27%, and the development of Fusarium oxysporum colonies was reduced by 100% in cormel internal tissue.

Key words: Gladiolus grandiflorus, macronutrients, micronutrients, ornamental, vegetative seed.


 

INTRODUCTION

Gladiolus (Gladiolus grandiflorus Andrews) is an appreciated ornamental plant worldwide (Halder et al., 2007), whose corms are used for asexual propagation. A plant is originated from a corm and from the underground stem a new corm is formed, which produces cormels at its base. Both these structures are used as vegetative seeds (Cantor and Tolety, 2011). In Mexico, there are 3600 ha of gladiolus plantations and the State of Puebla is the leading producer with 38% of national production (SIAP, 2012). Some of the main gladiolus varieties grown in the San Martin Texmelucan (SMT) region in the State of Puebla are 'Borrega Blanca', 'Borrega Roja', 'Espuma', and 'Grand Prix'. Most farmers in this area produce their own seeds; therefore, 10% of the total surface is devoted to cormel and corm production. One of the main problems in this region is that farmers use their own vegetative seeds; these are stored under uncontrolled conditions (humidity and temperature) that reduce their quality with consequent health loss during the growth period (Cohat, 1993). During crop development, corms can also get various diseases from soilborne fungi or from the same propagules, which leads to estimated losses of 40% to 70% by plant wilt. Then the same asexual seed contributes to the spread of diseases in the field (González-Pérez et al., 2009).

Several ornamental crops are infected mainly by species of Fusarium and their control depends on managing crop factors such as cultural practices, cultivar resistance, nutrition, and environmental conditions. Efforts to control potential F. oxysporum inoculums are the following: treating bulbs with hot water, either alone or in combination with a fungicide treatment (Gullino et al., 2012); bulb, corm, and seed irradiation with shortwave ultraviolet light at low exposition time is also an alternative to avoid fungicides (Elmer and McGovern, 2004) as well as adjusting soil pH between 6.5-7.0 (Gullino et al., 2012). Moreover, some nutrient elements are recommended to control Fusarium wilt, such as low N rates (Engelhard, 1989); this element in excess promotes the development of Fusarium that affects the physical health and quality of the corms (González-Pérez, 2006). Other nutrients to decrease corm rot are K (Gullino et al., 2012) and S (Chandel and Deepika, 2010). In other crops, S (100N-20S-46P2O5 kg h-1) in wheat production was effective to control root rot by Fusarium spp. (Melgar et al., 2001), whereas in carnation (Dianthus caryophyllus L.), B and Ca maintain proper soil pH (6.5-7.5) and limit the development of Fusarium spp. (Engelhard, 1989).

On the other hand, using organic amendments that contain large amounts of fertilizer enhance the disease (Gullino et al., 2012). This is the case in carnation where N at more than 100 kg ha-1 induces root rot (Engelhard, 1989). In the region of the present study, no available technical information to manage corm rot by Fusarium has been generated and farmers apply crop rotation to reduce the disease and only plant the gladiolus crop in the same field every 5 yr.

Fertilization practices are mainly applied to improve the overgrown physical quality of the gladiolus crop in the hope of obtaining better physical vegetative seed; this depends on climatic conditions, irrigation method, and soil type (Shaukat et al., 2012). A proper nutrient balance of N, P (200 kg ha-1; Lehry et al., 2011), K, and micronutrients such as B are necessary to increase the number of cormels per corm (Khan and Ahmad, 2004; Haider et al., 2007). More specifically, the combination of N (50 kg ha-1) and K (77.5 kg ha-1) promotes the reproduction of cormels (Butt, 2005). Furthermore, N, P, and K in a proportional relationship (5:5:5 g pot-1) increase the diameter and weight of corms (Khan and Ahmad, 2004), whereas an excess of N promotes vegetative growth at the expense of size and corm sanitary quality. This happens when the N:P proportion is different to the ratio 3N:1P (Vidalie, 2001). By itself, P at rates higher than 40 kg ha-1 induces larger corms and increases the number and size of cormels and in a deficient rate affects the growth of gladiolus corms (Hossian et al., 2011; Shaukat et al., 2012). For K, rates greater than 100 kg ha-1 increase cormel production due to the effect of K on the translocation of newly synthesized photosynthates and their mobilization of stored materials in the mother corm (Zubair, 2011). Other elements such as Ca and Mg are related to flower vase life (Bai et al., 2009). In gladiolus, adding B at 1.0 kg ha-1 increases the number and size of corms (Halder et al., 2007) and in tulip (Tulipa gesneriana L.) B deficiency induces smaller bulb size (Bobadilla and Chimenti, 2013). In SMT, Puebla, some soils are deficient in macro- and micronutrients so that farmers traditionally apply a fertilization rate of 81N-24P-171K-37.2Ca-23Mg-0B-0S kg ha-1 to enhance gladiolus flower crop production although Fusarium wilt disease and vegetative seed quality are unresolved (González-Pérez; personal communication). Based on the above, the aim of this study was to evaluate some physical qualities and health characteristics in gladiolus corm and cormels generated at different fertilization rates, assuming that adding some nutritional elements and adjusted rates produce better gladiolus vegetative seeds than the ones currently used by the farmers in the study area.

MATERIALS AND METHODS

The study was carried out in San Martin Texmelucan (SMT), Puebla in the Tlacotepec de Jose Manzo community belonging to El Verde municipality (19°12'18" N; 98°26'54" W; 2425 m a.s.l.) with Cw type climate (Garcia, 2004) in clay loam and slightly acid soil (Table 1).

Table 1. Content characteristics of a clay loam and slightly acid soil analysis in the community of Tlacotepec de Jose Manzo, El Verde, Puebla.

1Analysis performed by A&L Agricultural Laboratories (Pompano Beach, Florida, USA) during 2010.
ΔTotal amount.


Plant material and treatments

From a previous field experiment carried out in July 2009 (González-Pérez et al., 2011), 240 corms and cormels of 'Borrega Roja' and 'Espuma' were harvested with field fertilization rate (FD) experiments and then evaluated. Treatments were four FDs, including the regional rate (FD-R; Larson, 1992), and three other new estimated combinations, FDs 1 to 3. The experiment was conducted in a factorial randomized complete block design with four replicates (Table 2). Fertilizer sources were agricultural lime, ammonium nitrate, borax, di-ammonium phosphate, magnesium sulfate, potassium chloride, and potassium nitrate (kg ha-1).

Table 2. Composition of four fertilizer rates used in the production of corms and cormels of two gladiolus varieties (Tlacotepec de Jose Manzo, El Verde, Puebla) during the 2009 spring-summer cycle.

FD-R: Traditional fertilization rate (FD) used in the region (R) under study.

From preliminary experiments, the new FDs 1 to 3 were estimated and the traditional regional FD-R used by farmers was the reference point. A total of 81 combinations (nutrient elements and rates) were calculated and 12 were selected by a 'San Cristobal' matrix (Martínez and Martínez, 1998) and evaluated in vitro to know which ones had some kind of negative influence on the physiology or nutrition of Fusarium. In agar medium emended with a proportional rate of 12 selected combinations, four F. oxysporum f. sp. gladioli isolates were plated in 12 treatments with three replicates of each one; the ones that showed a retarding growth rate of the fungus were chosen to prepare FD1 (rates estimated from FD-R less nutrient contribution from irrigation water; González-Pérez, 2006), FD2, and FD3 combinations (González-Pérez, 2006).

In addition to the desired cormel health characteristics, a study was designed to know if these three new FD combinations also had beneficial effects on physical qualities of the vegetative seed produced.

Corm and cormel analysis
During harvest, 30 mother corms (MC) along with their cormels were randomly selected for each treatment (four FDs) and variety ('Borrega Roja' and 'Espuma'). In the MC, evaluated variables were: corm fresh weight (CFW, g), number of cormels produced per corm (NcMC), and total fresh weight of cormels (TFW, g).

In cormels separated from the MC, size (mm), TFW, and health were assessed. In order to determine cormel size, these were sieved through 50 x 80 cm sieves of different mesh diameters (mm). Cormels were classified according to the mesh size used and their TFW was recorded by size.

Cormel health
This parameter was evaluated in 160 random cormels (20 per treatment and variety). Each of the cormel tunics was removed and rinsed in running water for 20 min (soil removal) and dried over sterile towels inside a laminar flow chamber. Cormels were disinfested with a 1.5% sodium hypochlorite solution for 3 min and dried as mentioned above. Then cormels were rinsed three times with sterile distilled water and re-dried inside the chamber. Eighty cormels were planted directly in Petri dishes with PDA (potato-dextrose-agar; Bioxon, Mexico) and the remainder were split longitudinally and plated in the same medium with the inner side tissue in contact with the medium. All the Petri dishes were incubated for 12 d at 21 °C with a continuous 40 W white light. As fungal colonies developed, the incidence rate per cormel was recorded. The fungi species were identified with the same methodology described in González-Pérez (2006) and González-Pérez et al. (2009). Literature techniques and descriptions were also used for the main Fusarium species that cause corm rot (Booth, 1971; Nelson et al., 1983; Leslie and Summerell, 2006).

Statistical analysis
Non-parametric one-way ANOVA and rank mean comparisons by the Kruskal-Wallis test (p ≤ 0.05) (Kruskal and Wallis, 1952) were done to obtain data with the Statistical Analysis System software (SAS Institute, 2009).

RESULTS AND DISCUSSION

The field factorial design was unable to comparatively analyze the effect of interaction between varieties and FDs because seven nutrients included in formulating the four FDs (Table 2) were not analyzed individually in different treatments. The exceptions were FD3 and FD-R (traditional regional rate), which were different only for B. However, FD-R had the worst values in all the parameters evaluated followed for FD3 (with B); B in soil of the present study had very low rates (Table 1), thus indicating that possibly the B rate used was inadequate for gladiolus plants. Also, possibly in FD-R, the high N rate composition plus the medium amount of N in the soil (Table 1) benefited vegetative growth at the expense of smaller size and lower cormel sanitary quality (Vidalie, 2001).

Some corm physical qualities
There were significant differences only among NcMC and TFW parameters and some of the FD treatments (p ≤ 0.05) (Table 3). For CFW, any one of the three FDs and FD-R in each variety showed significant effects. The highest NcMC was with FD2 in both varieties and equal to FD1 only in 'Borrega Roja'. For TFW, FD1 was the best in 'Borrega Roja', while it was the best for FD2 in 'Espuma'. A direct proportion between NcMC and TFW was shown by FD1 in the first variety and the same with FD2 in the last variety. For the three parameters, FD3 was significantly equal to the traditional regional FD-R and both showed the lowest values (Table 3).

Table 3. Mother corm and cormel physical qualities of two gladiolus varieties at four fertilization rates (FD; kg ha1) (Tlacotepec de Jose Manzo, El Verde, Puebla) during the 2009 spring-summer cycle.


FD1: 65N-14.9P-171K-16.6Mg-31.2Ca-0.0B-0.0S; FD2: 40.5N-24P-
171K-23Mg-37.2Ca-0.2B-8.5S; FD3: 81N-24P-171K-23Mg-37.2Ca-
0.2B-0.0S; FD-R (regional traditional fertilization rate): 81N-24P-171K-23Mg-37.2Ca-0.0B-0.0S.
The same letter within a column indicates no significant differences according to the Kruskal-Wallis rank mean test (p ≤ 0.05).


The fact that for TFW, FD1 was better for one variety and FD2 for another variety was related to the expected variation in genetic constitution of each variety and therefore, possibly their nutrient and rate requirements were different for NcMC with FD1.

Cormel physical qualities and health
There were significant differences (p ≤ 0.05). The generated cormels were classified into five sizes and weight (TFW) varied depending on the size (Table 4). In both varieties, 6-8 size showed the highest TFW mainly with FD2 followed by FD1 only in 'Borrega Roja'. Regarding the four FDs, the 10-12 size (considered ideal for propagation) had the lowest TFW and the 2-4 size recorded the worst TFW.

Table 4. Size (mm) classification and cormel total fresh weight distribution of two gladiolus varieties in response to four fertilization rates (FD; kg ha-1) (Tlacotepec de Jose Manzo, El Verde, Puebla) during the 2009 spring-summer cycle.

FD1: 65N-14.9P-171K-16.6Mg-31.2Ca-0.0B-0.0S; FD2: 40.5N-24P-
171K-23Mg-37.2Ca-0.2B-8.5S; FD3: 81N-24P-171K-23Mg-37.2Ca-
0.2B-0.0S; FD-R (regional traditional fertilization rate): 81N-24P-171K-23Mg-37.2Ca-0.0B-0.0S.
Same letter within a column indicates no significant differences according to the Kruskal-Wallis rank mean test (p ≤ 0.05).


External tissue. Significant differences were observed. The lowest incidence of Fusarium spp. was recorded in FD2 in both varieties, whereas it had the highest percentage in the traditional regional rate (FD-R) (Table 5). The presence of Fusarium on the external surface tissue demonstrates that this was a soilborne species where cormels were produced. However, such cormels did not show any symptoms of external rot as previously observed in other studies reported by González-Pérez et al. (2009) in the same area of study.

Table 5. Percentage of fungal isolates in cormels of two gladiolus varieties in response to four fertilization rates (FD; kg ha-1) (Tlacotepec de Jose Manzo, El Verde, Puebla) during the 2009 spring-summer cycle.


FD1: 65N-14.9P-171K-16.6Mg-31.2Ca-0.0B- 0.0S; FD2: 40.5N-24P-
171K-23Mg-37.2Ca-0.2B-8.5S; FD3: 81N-24P-171K-23Mg-37.2Ca-
0.2B-0.0S; FD-R (regional traditional fertilization rate): 81N-24P-171K-23Mg-37.2Ca-0.0B-0.0S.
Same letter within a column indicates no significant differences according to the Kruskal-Wallis rank mean test (p ≤ 0.05).


Internal tissue.
In both varieties no significant differences were shown with FDs 1 to 3 although in 'Espuma', FD2 had 0.0% incidence of F. oxysporum (Booth, 1971; González-Pérez et al., 2009); this was followed by FD1 in the same variety (Table 5). In contrast, FD-R showed the highest percentage of F. oxysporum isolates.

From the physiological or nutritional point of view, FD2 followed by FD1 helped the MC to produce the best NcMC, TFW, and healthiest cormels. The strength of FD2 possibly relies on its lower N rate and adding B and S in relation to FD-R, which produced the worst cormels. However, assumptions can only be made since these three nutrients were not analyzed in separate experiments. They were selected for their in vitro negative effect on F. oxysporum colony development (González-Pérez, 2006). As mentioned before, B and Ca in carnation are good for Fusarium control (Engelhard, 1989) and to keep soil pH at 6.5-7.5. The beneficial effect of B was possibly also associated with strengthening the cormel cell wall since B participates in the maintenance and synthesis of cell walls and plasma membrane integrity (Cakmak and Romheld, 1997; Cara et al., 2002); this possibly helps to prevent infection by Fusarium.

As for adding S, this nutrient should also contribute to less cormel rot at the base than in general; applying S directly to the soil has a beneficial effect on plants and helps them to reduce the development of fungi and other pathogens (Melgar et al., 2001); specifically, it reduces the amount of corm rot in gladiolus (Chandel and Deepika, 2010).

Regarding N, FD1 and FD2 had 20% and 50% less than FD-R, respectively. This nutrient is possibly a key element. There are indications that low N rates (50 kg ha-1), such as in FD2, induce higher corm and cormel weight (Butt, 2005; Pant, 2005) and in some crops can control Fusarium wilt (Engelhard, 1989); some reports agreed with these studies for cormel TFW and health results and a high N rate reduces the physical and health quality of corms (González-Pérez, 2006).

In the study region, soil pH was 5.8 (Table 1) and the source of N applied to soil was mainly as NH4; thus, both these related facts can perhaps explain that F. oxysporum was undeveloped in internal tissue with FD2. Damage by Fusarium species in corn and eggplant decreased according to Datnoff et al. (2007), who found that this was due to acid pH and NH4 in the soil. Furthermore, it is possible that the amount of N applied in FD2 was adequate for gladiolus physiology so that cormel carbohydrate content was moderate (Bennett, 1993). For this reason, these cormels could have proper cell size and cell wall cellulose content, which should then induce mechanical strength to the vegetative seeds; all these facts could defend them against Fusarium cormel rot and later plant wilt in the field (Datnoff et al., 2007). In FD-R, the amount of N applied was believed to be excessive, so the cell wall was possibly weak and the cormels produced were succulent and thus had the highest Fusarium rate colonization. These assumptions were made in studies by Bennett (1993) on onion bulbs and Datnoff et al. (2007) in the role of N in plant physiology.

For FD1, this FD lacked B and S and had 20% more N and less P, Ca, and Mg than FD2. The reduction of the last three nutrients was possibly not substituted by the soil composition, which had very low to medium amounts of them (Table 1). Thus, it could be deduced that these three nutrient rates should be adequate for some physiological or nutritional requirements of some varieties, or that their deficiencies were substituted by rates of 20% more N. This could explain that FD1 in 'Borrega Roja' was equal to FD2 for NcMC, better in TFW, and close to 6-8 cormel size (physical seed qualities); in 'Espuma', it was equal to FD2 for healthy seed quality (internal tissue). The latter finding is also possibly related to the fact that the N: P proportion in FD1 was close to 3N(65):1P(14.9) kg ha-1, which are rates that allow physical and healthy corm production (Vidalie, 2001). In general, several authors recommend the use of low N rates (50 kg ha-1) and B incorporation for disease management in different crops because if the N concentration is exceeded, then the presence of various Fusarium species is promoted (Engelhard, 1989; Daughtrey and Benson, 2005; González-Pérez et al., 2011).

CONCLUSIONS

The physical quality and health characteristics of cormel vegetative seed were enhanced mainly with FD2 and the traditional regional rate FD-R was at an extreme disadvantage. In FD-R, the excess of N and lack of B and S seems to negatively affect vegetative seed generation in this ornamental plant. Future studies should be focused on identifying their single effects as well as any possible interaction between them.

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ACKNOWLEDGEMENTS: We wish to thank Hector Sanchez for providing plant material and advice on agronomic crop management, the Colegio de Postgraduados-Campus Montecillo for the facilities provided for the development of this study, and to the National Council for Science and Technology (CONACYT) for financial support.

Received: 11 June 2013; Accepted: 9 January 2014.