Physiological Response of Flax Seedlings with Different Drought-resistances to Drought Stress

doi:10.7668/hbnxb.201751272

Abstract

Abstract: Aiming to elucidate the physiological response mechanism of different drought resistant flax strains to drought stress. In a pot culture, four flax varieties (Jinya 7, Jinya 10, Jinya 11 and E051-20) with different types of drought resistance were used as the materials to study the effects of drought stress on the growth, membrane lipid peroxidation and osmotic adjustment substance content of flax seedlings. The results showed that, with the increase of drought stress and the length of stress time, the plant height, stem diameter, biomass and leaf relative water content of the plant decreased significantly, and the strong drought-resistant varieties decreased significantly less than the weak drought-resistant varieties, which was in turn:Jinya 7 < Jinya 10 < Jinya 11 < E051-20. At the same time, the MDA content, membrane relative permeability and proline content increased significantly, and the accumulation of proline content in resistant varieties was significantly higher than in less resistant varieties, with the order of Jinya 7 > Jinya 10 > Jinya 11 > E051-20. The malondialdehyde and plasma membrane permeability in weak resistant varieties increased more than in strong resistant varieties, and the amount of increase in turn was Jinya 7 < Jinya 10 < Jinya 11 < E051-20. The content of soluble protein was relatively stable. POD enzyme activity generally showed an upward trend, and the increase range of varieties with strong drought resistance was significantly higher than those with weak resistance. The correlation analysis showed that the plant height and stem diameter had very significantly positive correlation with the biomass, but had extremely significantly negative correlation with the contents of MDA and proline. It suggested that the biomass, MDA content and proline content could be used as the indexes to judge the drought resistance of flax seedlings.

Key words: Flax, Drought stress, Lipid peroxidation, Osmotic adjustment

CLC Number:

S565.9

WU Ruixiang, YANG Jianchun, WANG Liqin, GUO Xiujuan. Physiological Response of Flax Seedlings with Different Drought-resistances to Drought Stress[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(2): 145-153. doi: 10.7668/hbnxb.201751272.

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