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赤皮青冈幼苗叶片解剖结构对干旱胁迫的响应 被引量:54

Response of leaf anatomical characteristics of Cyclobalanopsis gilva seedlings to drought stress
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摘要 以浙江庆元、湖南洞口和湖南靖州3个种源的赤皮青冈1年生幼苗为材料采用盆栽称量法控制土壤水分含量般置土壤相对含水量分别为75%-80%(对照)、55%-60%(轻度干旱胁迫)、45%-50%(中度干旱胁迫)和30%-35%(重度干旱胁迫),研究不同程度干旱胁迫对赤皮青冈幼苗叶片解剖结构和蒸腾作用的影响.结果表明:干旱胁迫下,3个种源赤皮青冈幼苗叶片的总厚度、上下表皮厚度和栅栏组织厚度均显著降低.栅栏组织厚度与海绵组织厚度比(栅海比)、气孔长度和宽度随干旱程度的增强而显著减小,而气孔密度随干旱胁迫程度的增强而显著增加.干旱处理对叶片主脉厚度无显著影响,木质部厚度的变化因种源而异.叶片结构的变化引起生理功能改变脯着胁迫程度的加强赤皮青冈幼苗的蒸腾速率显著降低.对照和备干旱处理湖南洞口种源幼苗叶片的下表皮厚度、栅海比、气孔密度显著大于其他2个种源蒸腾速率显著小于其他2个种源表明湖南洞口赤皮青冈对干旱胁迫的适应性较强. In this study,the leaf anatomical characteristics and transpiration rate of one-year-old seedlings from three study areas including Qingyuan of Zhejiang Province,Dongkou and Jingzhou of Hunan Province were investigated using a pot planting experiment in which relative soil water content was kept as 75%-80%(control),55%-60%(mild drought stress),45%-50%(moderate drought stress),30%-35%(severe drought stress),respectively.The results showed that drought stress significantly reduced the total thickness of the seedling leaves,the thickness of their upper and lower epidermis and the thickness of palisade tissue.The ratio of the palisade tissue to spongy tissue,stomatal length and width also decreased significantly,while the stomatal density increased significantly as the drought stress became more intense.The treatments of drought stress had no significant effect on the thickness of the main veins of the leaves although their xylem thickness varied depending on the seedlings from the different study sites.The change of leaf structure caused the change of physiological function.As drought stress was intensified,the transpiration rate of C.gilva seedlings decreased significantly.The ratio of the palisade tissue to spongy tissue,the thickness of the lower epidermis and stomatal density of the seedlings from Dongkou of Hunan Province were significantly greater,while the transpiration rate was significantly lower than those from other two study sites for all the drought stress treatments,implying that the C.gilva seedlings from Dongkou of Hunan Province had a stronger drought-resistance ability.
出处 《应用生态学报》 CAS CSCD 北大核心 2015年第12期3619-3626,共8页 Chinese Journal of Applied Ecology
基金 国家"十二五"科技支撑计划项目(2012BAD21B03)资助
关键词 赤皮青冈 叶片 解剖结构 干旱胁迫 Cyclobalanopsis gilva leaf anatomical characteristics drought stress
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