Effects of nitrogen on growth and physiological characteristics of wheat seedlings under drought stress

doi:10.14088/j.cnki.issn0439-8114.2020.08.004

Abstract

Abstract: The changes of growth indexes, physiological characteristics and chlorophyll content in wheat seedling leaves under different water-nitrogen coupling were determined. The wheat cultivars, namely Shangmai 5226 and Xiaoyan 15, were treated with 3 nitrogen levels low nitrogen, medium nitrogen, high nitrogen（0.5、8.0、15.0 mmol/L） and drought treatment simulated by PEG-6000. The results showed that, under moderate drought stress, maximum root length, net photosynthetic rate and chlorophyll content were high nitrogen > medium nitrogen > low nitrogen, seedling height and stomatal conductance were medium nitrogen > high nitrogen > low nitrogen; under severe drought stress, maximum root length showed low nitrogen>medium nitrogen>high nitrogen, net photosynthetic rate and chlorophyll content were medium nitrogen>high nitrogen>low nitrogen; under two drought treatments, root-shoot ratio was low nitrogen > medium nitrogen > high nitrogen, and intercellular CO₂ concentration was high nitrogen > low nitrogen > medium nitrogen. Moderate nitrogen could enhance the growth and photosynthetic capacity of wheat seedlings, indicating that nitrogen had a certain compensatory effect on drought stress.

Key words: wheat seedlings, nitrogen, drought stress, growth indexes, physiological characteristics

CLC Number:

S512.1

WU Xiu-ning, LIU Ying, WANG Xin-jun, ZHAO Zhi-xin, ZHAO Peng. Effects of nitrogen on growth and physiological characteristics of wheat seedlings under drought stress[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(8): 21-24.

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