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Revista chilena de historia natural

Print version ISSN 0716-078X

Abstract

PINTO, MANUEL et al. Effect of the ultraviolet-B radiation on growth and photosynthesis of seven varieties of wheat (Triticum aestivum L.). Rev. chil. hist. nat. [online]. 2000, vol.73, n.1, pp.55-66. ISSN 0716-078X.  http://dx.doi.org/10.4067/S0716-078X2000000100007.

The effect of UV-B radiation on growth and photosynthesis of seven Chilean varieties of wheat ( ERP V-8, Lilén, Millaleu, Nobo, Reihue, Talhuén and Huayún) was evaluated during the first six weeks of growth. Plants were irradiated 4 hours daily with 22.5 µW cm-2 of UV-B radiation and with a white light intensity (12 h photoperiod) that averaged 400 µmol m-2 s-1. The varieties Talhuén, Lilén and Nobo were the most sensitive to this treatment in terms of their reduction in leaf area and in fresh and dry matter accumulation. UV-B absorbing compounds increased in all the plants treated with UV-B but this increase was not related with the growth sensitivity shown by the different varieties to this radiation. A decrease in CO2 assimilation was detected in all the varieties as a consequence of the UV-B treatment. However, this decrease was significant only in Talhuén which was one of the most sensitive to UV-B. The PSII quantum yield, measured as Fv/Fm ratio, decreased in all the varieties under high white light intensities. This photoinhibitory effect was reduced when plants were previously irradiated with UV-B, particularly in the more sensitive varieties (Talhuén y Lilén). This kind of photoprotection exerted by the UV-B radiation is discussed. Finally, it is concluded that varieties ERP-V8, Millaleu and Huayún were the most tolerant to the level of UV-B radiation used in this case

Keywords : UV-B radiation; photosynthesis; growth; wheat varieties; Triticum aestivum L.

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