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《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:

2014年07期

Page:

56-61

Research Field:

Publishing date:

Info

Title:

Determination of Semilethal Temperature of Three Varieties of Weigela florida Under Low Temperature Stress and Evaluation on Their Cold Resistance

Author(s):

HAI Xiao-xia; LV Fei; WANG Zhi-gang; NIE Qing-juan; LIU Bing-xiang

Key Lab of Genetic Resources of Forest and Forest Protection of Hebei Province,College of Forestry,Agricultural University of Hebei,Baoding,Hebei 071001

Keywords:

Weigela florida; relative electric conductivity; relative K+ leakage; free water; bound water; semilethal temperature(LT₅₀)

PACS:

S 687

DOI:

-

Abstract:

Taking the current twigs which of three varieties of Weigela florida (Weigela florida cv. Red Prince,Weigela florida cv.Variegata, Weigela florida(Bunge) A.DC) as materials，by artificial freezing method and atomic absorption spectrometer,the relative K+leakage and electric conductivity of dormant,the current twigs which of three varieties of Weigela florida were calculated with different low temperature 0 (CK),-10,-20,-30,-40℃.Regression models were established between low temperature (T) and the relative K+leakage and electric conductivity to calculate the semilethal temperatures (LT₅₀)；and measured the free and bound water and its ratio of the three different varieties of stem tissue.The results showed that the relative K+leakage and conductivity of dormant the current twigs gradually increased with the decreasing temperature under low temperature stress,it showed significant difference compared with the control（P＜0.05）；the semi-lethal temperatures (LT₅₀) of three varieties of Weigela florida were calculated respectively by logistic equation regression analysis of the relative K+ leakage and eletric conductivity,which of Weigela florida cv Red Prince,Weigela florida cv.Variegata,Weigela florida(Bunge) A.DC were -35.60,-32.21,-31.50℃ and -34.88,-31.14,-28.44℃.The bound water content of three varieties were higher than the free water under low temperature stress.The order of bound water/free water ratio was Weigela florida cv.Variegata > Weigela florida cv. Red Prince>Weigela florida(Bunge) A.DC.The comprehensive comparison results showed that the cold resistance of the three varieties was in the order of Weigela florida cv.Variegata >Weigela florida cv. Red Prince> Weigela florida(Bunge) A.DC.

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Last Update: 2014-08-13