نوع مقاله : مقاله پژوهشی
نویسندگان
گروه زراعت و اصلاح نباتات دانشکده کشاورزی دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران. کرج. ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Cold is one of the important environmental factors involved in the survival, growth and performance of crop plants. In this research, the traits related to cold tolerance were evaluated in the lines resulting from crossing Norstar (cold-tolerant) and Pishtaz (cold-sensitive) wheat (Triticum aestivum L.) in the vegetative stage (December, January and February) under field conditions. Norstar parent and lines L2 and L1 showed the highest LT50 degrees (-22, -20 and -18 ºC, respectively) in January. A decrease in cold tolerance was observed simultaneously with the beginning of the reproductive phase in February in all genotypes. Damage indices such as H2O2 and MDA were lower in winter lines than in spring lines. The content of H2O2 in the Norstar parent and lines L1 and L2 was low during cold acclimation periods, but increased with the transition from the vegetative stage to the reproductive stage. The high level of MDA in February, especially in spring genotypes, indicated the presence of oxidative stress and MDA. The activity of acetyl coenzyme A carboxylase and Δ12 desaturase genes increased with the continuation of the cold acclimation period, so that the highest increases were observed in winter lines and in January. Therefore, the genotypes with vernalization requirement by adjusting the traits related to cold tolerance in the vegetative stage have higher tolerance to cold stress.
کلیدواژهها [English]
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