Abstract

GARRIDO, Marco et al. Grain yield of nine quinoa genotypes (Chenopodium quinoa Willd.) grown in Mediterranean environments differing in water availability. Idesia [online]. 2013, vol.31, n.2, pp.69-76. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292013000200010.

Quinoa is an Andean pseudo cereal reputed to be drought resistant. Few studies, however, have related drought intensity to grain yield. The objective of this work was to evaluate the grain yield and its interaction with the environment of nine quinoa genotypes of different origin under four watering environments. The genotypes were exposed to two watering regimes (dryland and irrigated) over two seasons in Central Chile. The watering regimes were characterized by the amount and water distribution during the growing season. E1 (487.8 mm), E2 (245.9 mm), E3 (660 mm), E4 (567.1 mm). The yield of the genotypes was reduced to less than 50% when irrigated at 44 and 80% ETo. There were significant interactions between genotype and environment for grain yield, harvest index, and grains m-2. A PCA showed a strong and significant association among yield, harvest index and grains m-2, a low variability among genotypes when stressed and a much higher variability when the stress was not present. Two mega-environments were separated by year (E1 and E2 vs E3 and E4). The genotype BAERII had the highest yield and Baer was the most stable in E1 and E2. The genotype 4B-216 had the highest yield and 03-21-079 was the most stable in the megaenvironment grouping E3 and E4.

Keywords : GxE interaction; terminal drought; SREG; stability.

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