Quantitative and qualitative changes in carbohydrates associated with spring deacclimation in contrasting Hydrangea species

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• 作者：Majken Pagter^a ; ^{majken.pagter@agrsci.dk"" rel=""nofollow} ; Isabelle Lefè ; vre^c ; Rajeev Arora^b ; ^{rarora@iastate.edu"" rel=""nofollow} ; Jean-Francois Hausman^c ; ^{hausman@lippmann.lu"" rel=""nofollow}
• 关键词：Climate change ; Freezing tolerance ; 1-Kestose ; Soluble sugars ; Water status
• 刊名：Environmental and Experimental Botany
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：72
• 期：3
• 页码：358-367
• 全文大小：952 K

文摘

Cold deacclimation and associated changes in soluble carbohydrates and water status of two Hydrangea species differing in susceptibility to frost injuries was followed under natural conditions. In fully cold hardy plants of H. macrophylla stem freezing tolerance fluctuated in parallel with changes in air temperature, while in a seasonal perspective increased temperatures caused a sigmoid deacclimation pattern in both H. macrophylla and H. paniculata. Timing of deacclimation was approximately synchronized in the two species, but H. paniculata, the hardier species based on mid-winter hardiness, deacclimated faster than H. macrophylla, indicating that deacclimation kinetics were not correlated with mid-winter hardiness. In both species concentrations of soluble sugars decreased during deacclimation and were highly correlated with stem cold hardiness and air temperatures. This suggests that sugar hydrolysis may be an important temperature-driven mechanism of deacclimation in Hydrangea. Accumulation patterns of specific carbohydrates differed between the two species, suggesting that they utilize different strategies to overcome cold. In H. paniculata, deacclimation was associated with an increase in stem water content, which occurred shortly before bud burst and hence may be a prerequisite for leafing out.