The mechanism underlying overwintering death in poplar:the cumulative effect of effective freeze-thaw damage

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外文摘要：We analyzed the relationships linking overwintering death and frost cracking to temperature and sunlight as well as the effects of low temperatures and freeze-thaw cycles on bud-burst rates,relative electrical conductivity,and phloem and cambial ultrastructures of poplar.Overwintering death rates of poplar were not correlated with negative accumulated temperature or winter minimum temperature.Freeze-thaw cycles caused more bud damage than constant exposure to low temperatures.Resistance to freeze-thaw cycles differed among clones,and the budburst rate decreased with increasing exposure to freezethaw cycles.Cold-resistant clones had the lowest relative electrical conductivity.Chloroplasts exhibited the fastest and the most obvious reaction to freeze-thaw damage,whereas a single freeze-thaw cycle caused little damage to cambium ultrastructure.Several such cycles resulted in damage to plasma membranes,severe damage to organelles,dehydration of cells and cell death.We conclude that overwintering death of poplar is mainly attributed to the accumulation of effective freeze-thaw damage beyond the limits of freeze-thaw resistance.

外文关键词：

Effective freeze-thawFreeze-thaw resistanceMechanismOverwintering deathPopulusUltrastructure

作者：

Chengchao Yang、Jiandong Peng、Xiaoyu Li、Dejun Liang、Zhiyan Yang、Yan Zhang

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作者单位：

Liaoning Provincial Institute of Poplar, Gaizhou 115213,People's Republic of China

基金：

This work was supported by grants from the National Key Research and Development Program of ChinaThis work was supported by grants from the National Key Research and Development Program of ChinaLiaoning Provincial Key Research Project for Agriculture

项目编号：

Grant no 2016YFD0600401Grant no 2015103002

出版年：

2020

林业研究(英文版)

东北林业大学,中国生态学学会

林业研究(英文版)

CSTPCDCSCDSCI

影响因子：0.365

ISSN：1007-662X

年,卷(期)：2020.31(1)

被引量3
参考文献量38