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黑杨无性系间长期水分利用效率差异的生理基础
引用本文:赵凤君,沈应柏,高荣孚,苏晓华,张冰玉.黑杨无性系间长期水分利用效率差异的生理基础[J].生态学报,2006,26(7):2079-2086.
作者姓名:赵凤君  沈应柏  高荣孚  苏晓华  张冰玉
作者单位:1. 北京林业大学生物科学与技术学院,北京,100083
2. 中国林业科学研究院林业研究所,北京,100091
基金项目:高比容电子铝箔的研究开发与应用项目
摘    要:试验于2003年6月10日至8月20日在温室中进行,采用完全随机区组设计,4个水分处理(充分供水、轻度胁迫、中度胁迫、重度胁迫),6次重复.各水分处理严格控制浇水间隔:充分供水,每2d浇水1次;轻度胁迫,每3d浇水1次;中度胁迫,每4d浇水1次;重度胁迫,每5d浇水1次.每次浇水的量相同,500ml.试验材料为美洲黑杨杂交无性系,父本为哈佛杨(Populus deltoides Bartr.CI.‘Harvard'),母本为山海关杨(Populus deltoides Bartr.CV.‘shanhaiguanensis'),共10个无性系,编号为J1~J10.以当前优良品系108杨(Populus euramericana CV.‘114/69')和中林46杨(Populus deltoides Bartr.CV.‘Zhonglin 46')为对照,编号为CK1、CK2.测定了12个无性系间长期水分利用效率(WUEL)、光合参数(净光合速率Pn、蒸腾速率Tr、气孔导度Gs、瞬时水分利用效率WUEi、最大净光合速率Pmax、光饱和点LSP、羧化效率Ce)及气孔特征参数(气孔频度、气孔大小、上/下表皮气孔数目比)、根冠比的差异,并深入分析了光合参数与WUEL、气孔特征参数与WUEL、根冠比与WUEL及光合参数之间的相互关系.结果表明:无性系间WUEL存在差异,这种差异随水分胁迫的加剧而更加显著.无性系间WUEL的差异在4个水分处理下表现出一致性,即WUEL最优的都是J2,其次为J6、J7、J8、J9.高WUEL的J2等无性系其气孔频度、气孔大小、Gs、Tr、Pn和根冠比在所有无性系中都处于适中的位置.它们的上/下表皮气孔数目比大,Pmax、LSP、Ce明显优于对照.Pmax高、LSP高、Ce大,表明高WUEL的J2等无性系光合能力强.Gs、Tr、Pn适中,表明J2等无性系在保证具有高WUEi的同时能保持较强的光合能力.根冠比适中,表明J2等无性系的光合产物在根、冠之间分配合理,能有充足的根系分布保证水分的供应,同时又有较多的光合产物积累在地上部分.气孔特征参数的差异是导致无性系间光合能力和WUEi差异,并最终导致WUEL差异的一个主要因子.气孔频度和气孔大小适中的无性系,其Gs、Tr、Pn适中,WUEi较高;上/下表皮气孔数目比大的无性系则具有较强的光合能力.无性系间WUEL的差异是一系列具有差异的生理参数共同作用的结果,高WUEL的无性系通常光合能力强、WUEi高、根冠比适中.今后工作中选育高WUE的无性系时,除需关注单个生理参数的突出作用外,更应关注生理参数的协同作用.

关 键 词:黑杨  无性系  长期水分利用效率(WUEL)  光合参数  气孔特征参数  根冠比
文章编号:1000-0933(2006)07-2079-08
收稿时间:2005-03-23
修稿时间:2005-03-232006-04-05

Physiological foundation for thedifferences of long-term water use efficiency among Populus deltoides clones
ZHAO Fengjun,SHEN Yingbai,GAO Rongfu,SU Xiaohua and ZHANG Bingyu.Physiological foundation for thedifferences of long-term water use efficiency among Populus deltoides clones[J].Acta Ecologica Sinica,2006,26(7):2079-2086.
Authors:ZHAO Fengjun  SHEN Yingbai  GAO Rongfu  SU Xiaohua and ZHANG Bingyu
Affiliation:1. Institute of Biologieal Science and Biotechnology , Beijing Forestry University, Beijing 100083, China ; 2. Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
Abstract:With randomized complete block design, long-term water use efficiency (WUEL), photosynthetic parameters (net photosynthetic rate Pn, transpiration rate Tr, stomatal conductance Gs, instantaneous water use efficiency WUEi, maximum photosynthetic rate P max, light saturation pointLSP, carboxylic efficiency Ce), stomatal properties (frequency, size, superior/inferior stoma amount ratio) and root/shoot ratio of twelve Populus deltoids clones were studied under water stress in a greenhouse. Four water treatments were designed, namely, well-watered condition, slight water stress, moderate water stress, and severe water stress. Although the volumes of irrigated water for different treatments were the same, the irrigation intervals were strictly controlled. The results showed that long-term water use efficiency (WUEL) differences among tested clones were obvious and became greater with the increase in water stress. J2, J6, J7, J8, and J9 were excellent clones with high WUEL. Stomatal frequency, stomatal size, Gs, Tr, Pn, and root/shoot ratio of J2et al were moderate, whereas the superior/inferior ratio, Pmax, LSP, Ce of J2et al were higher than other clones. The interrelations between WUEL and the physiological parameters were analyzed. The results revealed that the WUEL differences were induced by a series of physiological parameters, and clones with higher WUEL always had strong photosynthetic capacity, higher WUEi, and optimum root/shoot ratio.
Keywords:Populus deltoids  clones  long-term water use efficiency(WUE_L)  photosynthetic parameters  stoma properties  root/shoot ratio
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