Evaluation of drought response of two poplar clones (Populus x canadensis Monch 'I-214' and P-deltoides Marsh. 'Dvina') through high resolution analysis of stem growth
Evaluation of drought response of two poplar clones (Populus x canadensis Monch 'I-214' and P-deltoides Marsh. 'Dvina') through high resolution analysis of stem growth
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DOI：
10.1093/jxb/erm117
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发表时间：
2007-01-01
影响因子：
6.9
通讯作者：
Crivellaro, Alan
中科院分区：
文献类型：
--
作者：
Giovannelli, Alessio;Deslauriers, Annie;Crivellaro, Alan
以美洲黑杨（Populus deltoides）和加拿大杨（Populusx canadensis）为试材，研究了不同灌溉处理对干径变异（Delta R）和最大日干缩率（MDS）的影响，以评价其耐旱性的差异。从6月24日至8月10日，在混凝土罐中生长的一年生树木接受两种灌溉制度（自然降雨和灌溉），并通过自动点式树木生长计监测Delta R。与灌溉制度无关，‘Dandy’表现出比‘l-214’更高的茎径向生长量。在这两个无性系中，对土壤含水量变化的第一反应是MDS显著增加，而当黎明前叶水势（psi pd）下降到-0.4 MPa以下时，Δ R下降约20 d。然而，他们表现出不同的战略，以克服干旱。‘DALY’保持正Δ R的时间比‘1 - 214’长，后者在干旱期结束时具有较低的叶片psi pd和较大的叶片脱落。恢复灌溉后，‘DALLY’表现出更高的恢复茎生长的能力。“L-214”可能不能恢复次生生长，因为在干旱胁迫期间较高的叶片脱落和在恢复期间产生新展开的叶片。可以得出结论，较大的径向生长的'DALLY'来自一个更好的水分利用（碳吸收与水分损失）比'l-214'在有限的水分供应。
Different irrigation effects on stem radius variation (Delta R) and maximum daily shrinkage (MDS) in Populus deltoides 'Dvina' and Populusx canadensis 'l-214' were studied to assess differences in drought tolerance between clones. One-year-old trees growing in concrete tanks were submitted to two irrigation regimes (natural rainfall and irrigation) from 24 June to 10 August, and Delta R was monitored by automatic point dendrometers. Independently of the irrigation regime, 'Dvina' showed a higher stem radial increment than 'l-214'. In both clones, the first response to changed soil water content was a significant increase in MDS, whilst Delta R decreased about 20 d later when pre-dawn leaf water potential (psi pd) dropped below -0.4 MPa. However, they displayed different strategies to overcome drought. 'Dvina' maintained a positive Delta R for longer than 'l-214', which had lower leaf psi pd and greater leaf abscission at the end of the drought period. After irrigation resumed, 'Dvina' showed a higher capacity to restore stem growth. 'l-214' was probably unable to recover secondary growth because of higher leaf abscission during drought stress and the production of newly expanded leaves during recovery. It is concluded that the larger radial growth of 'Dvina' derived from a better water use (carbon uptake versus water loss) than 'l-214' under limited water availability.