Impact of drought on productivity and water use efficiency in 29 genotypes of Populus deltoides x Populus nigra
Impact of drought on productivity and water use efficiency in 29 genotypes of Populus deltoides x Populus nigra
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DOI：
10.1111/j.1469-8137.2005.01630.x
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发表时间：
2006-01-01
期刊：
影响因子：
9.4
通讯作者：
Brignolas, F
中科院分区：
文献类型：
--
作者：
Monclus, R;Dreyer, E;Brignolas, F
研究了29个美洲黑杨（Populus deltoidesxPopulus nigra）品种的生产力、水分利用效率（WUE）和耐旱性之间的关系，并探讨了某些叶片性状是否可以作为生产力、WUE和耐旱性的预测因子。记录的变量包括茎性状（如生物量）和叶结构性状（如叶面积）以及功能性状（如内在水分利用效率（Wi）和碳同位素鉴别力（Delta））。在中度干旱条件下，Delta与W-i呈负相关，与气孔导度呈正相关，表明Delta的多样性主要由气孔导度决定，多数高产基因型表现出较低的耐旱性（即生物量大幅减少），而低产基因型表现出较大的耐旱性。水分亏缺时提高WUE的能力是必要的，但不足以解释耐旱性的基因型多样性。
We examined the relationships among productivity, water use efficiency (WUE) and drought tolerance in 29 genotypes of Populus x euramericana (Populus deltoidesxPopulus nigra), and investigated whether some leaf traits could be used as predictors for productivity, WUE and drought tolerance.At Orleans, France, drought was induced on one field plot by withholding water, while a second plot remained irrigated and was used as a control. Recorded variables included stem traits (e.g. biomass) and leaf structural (e.g. leaf area) and functional traits [e.g. intrinsic water use efficiency (W-i) and carbon isotope discrimination (Delta)].Productivity and Delta displayed large genotypic variability and were not correlated. Delta scaled negatively with W-i and positively with stomatal conductance under moderate drought, suggesting that the diversity for Delta was mainly driven by stomatal conductance.Most of the productive genotypes displayed a low level of drought tolerance (i.e. a large reduction of biomass), while the less productive genotypes presented a large range of drought tolerance. The ability to increase WUE in response to water deficit was necessary but not sufficient to explain the genotypic diversity of drought tolerance.