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低温胁迫对8个核桃无性系抗寒生理指标的影响

Effects of Low Temperature Stress on Physiological Indices of Eight Cold Resistance Juglans sigillata Clones

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【作者】 李小琴彭明俊段安安庞静王有兵张凤良

【Author】 LI Xiao-qin1,2,PENG Ming-jun1*,DUAN An-an2,PANG Jing1,WANG You-bing2,ZHANG Feng-liang2(1.Key Laboratory of Culture and Breeding of Forest Plants,Laboratory of Plant Conservation and Reproduction of Endangered Forest Plants,State Forestry Administration,Yunnan Academy of Forestry,Kunming,Yunnan 650201,China;2.Forestry College, Southwest Forestry University,Kunming,Yunnan 650224,China)

【机构】 云南省森林植物培育和开发利用重点实验室国家林业局云南珍稀濒特森林植物保护和繁育实验室云南省林业科学院西南林业大学林学院

【摘要】 选用8个核桃无性系作为试验材料,经不同低温(4℃、-3℃、-6℃、-9℃、-12℃,4℃为对照)处理后,测定其叶片电导率、可溶性糖和丙二醛(MDA)含量,对核桃抗寒性进行研究。结果表明:随着胁迫温度的下降,叶片相对电导率呈现出"S"型上升趋势,核桃离体叶片半致死温度(LT50)在-5~12℃之间;可溶性糖与丙二醛含量的变化为先增加再下降,均在-6℃出现峰值,但抗寒性与可溶性糖含量呈正相关,而与丙二醛含量呈负相关。3种方法测定的核桃抗寒性基本一致,表明3个指标均可作为核桃抗寒性的鉴定方法。

【Abstract】 Cold resistance of 8 Juglans sigillata clones were examined by measuring the indices such as electrical conductivity,soluble sugar and malondialdehyde(MDA) contents in the leaves that were undergone different low temperatures(4℃,-3℃,-6℃,-9℃,-12℃,in which 4℃ was used as control).The results showed that with the decrease of the stress temperature,the relative electrical conductivity tended to rise as a "S" curve.The semilethal temperatures of the leaves in vitro(LT50)were between-5℃ to 12℃.Soluble sugar and MDA contents increased firstly then decreased with the decrease of temperature,two indices all arrived the maximum values at-6℃.The content of soluble sugar was positively correlated with the cold resistance,MDA however,was negatively correlated with the severeness of the coldness.The results of the cold resistance of 8 clones from the three evaluation indices were basically identical,indicating that they all could be applied in the evaluation of the cold resistance of J.sigillata.

【基金】 云南省林业厅“核桃良种扩繁技术推广”科技推广项目(2009TK055)
  • 【文献出处】 西北林学院学报 ,Journal of Northwest Forestry University , 编辑部邮箱 ,2012年06期
  • 【分类号】S664.1
  • 【被引频次】44
  • 【下载频次】294
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