Comprehensive evaluation on cold resistance of three kinds of ornamental branch plants

doi:10.14088/j.cnki.issn0439-8114.2022.09.018

Abstract

Abstract: In order to enrich the northern winter plant landscape,taking Rosa davurica × rugosa Thunb.,Euonymus maackii Rupr. and Salix alba L. as materials, the relative conductivity of annual branches of three kinds of ornamental branch plants under different low temperature treatments and the half lethal temperature （LT₅₀） was calculated by logistic equation. Finally, principal component analysis and membership function were used to comprehensively evaluate the cold resistance of branches under different low temperature treatments, such as relative conductivity, water content, water absorption, soluble sugar content, soluble protein content, proline content, malondialdehyde content and SOD content. The results showed that the relative conductivity of the three kinds of ornamental branch plants increased in an “S” shape with the decrease of temperature, following the change rule of logistic equation. The logistic equation was used to establish a regression model for the relative conductivity under different low temperature treatments. The half lethal temperature of Rosa davurica × rugosa Thunb. was -19.8 ℃, the half lethal temperature of Euonymus maackii was -28.7 ℃, and the half lethal temperature of Salix alba L. was -22.3 ℃. Based on the comprehensive evaluation of principal component analysis and membership function, the order of cold resistance of three kinds of ornamental branch plants from high to low was Euonymus maackii > Salix alba L. >Rosa davurica × rugosa Thunb.. Using principal component analysis and membership function method, the comprehensive index of cold resistance of three kinds of ornamental branch plants was obtained, which was consistent with the order of cold resistance of half lethal temperature calculated by conductivity method combined with logistic equation, indicating that the half lethal temperature can accurately reflect the cold resistance of three kinds of ornamental branch plants.

Key words: ornamental branch plants, relative conductivity, half lethal temperature, cold resistance evaluation

CLC Number:

S718.43

YAO Ying-li, LI Chun-you, PENG Wei-xiu, MA Chang-ming, LI Dan. Comprehensive evaluation on cold resistance of three kinds of ornamental branch plants[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(9): 95-99.

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