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Physiological responses to low temperature in spring and winter wheat varieties
Author(s) -
Zhang Bin,
Jia Dong,
Gao Zhiqiang,
Dong Qi,
He Liheng
Publication year - 2016
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.7306
Subject(s) - vernalization , hardiness (plants) , overwintering , malondialdehyde , agronomy , osmolyte , biology , photosynthesis , superoxide dismutase , sugar , proline , horticulture , peroxidase , botany , cultivar , antioxidant , food science , photoperiodism , biochemistry , enzyme , amino acid
BACKGROUND Northward expansion of winter wheat is an efficient means to improve crop yield and quality in many countries. However, inadequate cold hardiness restricts the northward expansion of winter wheat. This study aimed to investigate cold adaption of different wheat varieties and underlying physiological mechanism. RESULTS In the field experiment, soluble sugar and proline content, relative electric conductivity ( EC ) and malondialdehyde ( MDA ) content were higher in wheat varieties in the overwintering period than those in the pre‐wintering period. Superoxide dismutase ( SOD ) activity was lower in the overwintering period than in the pre‐wintering period and spring growth period. Photosynthetic rate was reduced dramatically in the winter variety (Suyin 10), weak winter variety (Lumai 22) and spring (Jinchun 9) variety after low‐temperature treatment. Cold treatment inhibited stomatal conductance ( G s ) and transpiration rate ( T r ). Influences of high‐temperature treatment and cold acclimation after vernalization were further analyzed in the greenhouse in wheat variety Jinghe 1. High‐temperature treatment after vernalization significantly inhibited SOD and peroxidase activities in the vernalized plants, while cold acclimation after vernalization enhanced peroxidase activity. CONCLUSION Cold tolerance of wheat varieties may be associated with effective osmoregulation ability, photosynthetic capacity, G s and T r , as well as activity of antioxidant enzymes. © 2015 Society of Chemical Industry