Impact of successive drought and re-watering cycles on growth and specific leaf area of two Populus x canadensis (Moench) clones, 'Dorskamp' and 'Luisa_Avanzo'.
Impact of successive drought and re-watering cycles on growth and specific leaf area of two Populus x canadensis (Moench) clones, 'Dorskamp' and 'Luisa_Avanzo'.
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DOI：
10.1093/treephys/23.18.1225
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发表时间：
2003-12
期刊：
影响因子：
4
通讯作者：
N. Marron;E. Dreyer;E. Boudouresque;D. Delay;J. Petit;F. Delmotte;F. Brignolas
中科院分区：
文献类型：
--
作者：
N. Marron;E. Dreyer;E. Boudouresque;D. Delay;J. Petit;F. Delmotte;F. Brignolas
以加拿大杨无性系Luisa_ Avanzo和Dorskamp为试材，比较了其温室扦插苗对连续干旱和复水（1-3个周期）的反应。在试验过程中，定期记录总叶片数增长率、叶片展开持续时间、总叶面积和单株叶面积扩展率以及气孔导度。土壤含水量（SWC）和黎明前叶水势（Psi（WP））在每个干旱周期测定4次。在平行，相对叶含水量（RWC）和比叶面积（SLA）估计从顶部到底部的每个切割收集的叶片。在充分浇水条件下，‘Luisa_Avanzo’和‘Dorskamp’的叶面积扩展模式不同。虽然无性系间展叶持续时间相似，但‘Luisa_ Avanzo’的总叶数增加率和单株叶面积增加率均高于‘Dorskamp’。结果，‘Luisa_Avanzo’插条的个体和总叶面积都比‘Dorskamp’大。‘Dorskamp’叶片比‘Luisa_Avanzo’叶片的SLA低。在连续的干旱周期中，两个无性系的总叶数增加率和总叶面积扩展率都有所下降，但只有'Luisa_Avanzo'的整株和单株叶面积都急剧下降。"Dorskamp“在干旱期间由于叶片扩展持续时间的增加而保持恒定的叶面积，并且对响应于复水的个体叶面积扩展速率和总叶数增加速率有显著的刺激。干旱导致'Luisa_Avanzo'比'Dorskamp' SLA下降幅度更大。“展开的叶子”Dorskamp“组成密集或厚，或两者兼而有之，而”路易莎_Avanzo“的叶子变得密集或厚，或两者兼而有之，只有在响应干旱。在这两个克隆，再浇水造成的SLA控制值的部分恢复。我们的数据证实了以前的田间和温室观察，“Dorskamp”比“Luisa_Avanzo”更能忍受连续的干旱和重新浇水周期。“我们得出结论，这种差异主要归因于‘Dorskamp’在重新浇水后的可塑性，而不是干旱反应的克隆差异。
Responses to successive drought and re-watering cycles (1-3 cycles) were compared in greenhouse-grown cuttings of Populus x canadensis (Moench) clones, 'Luisa_ Avanzo' and 'Dorskamp.' Total leaf number increment rate, duration of leaf expansion, total and individual leaf area expansion rates and stomatal conductance were recorded periodically during the experiment. Soil water content (SWC) and predawn leaf water potential (Psi(WP)) were measured four times during each drought cycle. In parallel, relative leaf water content (RWC) and specific leaf area (SLA) were estimated on leaves collected from the top to bottom of each cutting. Under well-watered conditions, 'Luisa_Avanzo' and 'Dorskamp' differed in their patterns of leaf area expansion. Although duration of leaf expansion was similar between clones, 'Luisa_ Avanzo' exhibited higher total leaf number increment rates and individual leaf area increases than 'Dorskamp.' As a result, 'Luisa_Avanzo' cuttings reached larger individual and total leaf areas than 'Dorskamp.' 'Dorskamp' leaves had lower SLA than 'Luisa_Avanzo' leaves. In response to successive drought cycles, both clones underwent decreases in total leaf number increment rates and in total leaf area expansion rates, but both whole-plant and individual leaf areas were drastically reduced only in 'Luisa_Avanzo.' 'Dorskamp' maintained a constant leaf area as a result of an increase in the duration of leaf expansion during drought and a significant stimulation of individual leaf area expansion rate and total leaf number increment rate in response to re-watering. Drought caused a greater decrease in SLA in 'Luisa_Avanzo' than in 'Dorskamp.' Expanded leaves of 'Dorskamp' were constitutively dense or thick, or both, whereas leaves of 'Luisa_Avanzo' became dense or thick, or both, only in response to drought. In both clones, re-watering caused partial recovery of SLA to control values. Our data confirm previous field and greenhouse observations that 'Dorskamp' is more tolerant to successive drought and re-watering cycles than 'Luisa_Avanzo.' We conclude that this difference is mainly attributable to the plasticity of 'Dorskamp' after re-watering, rather than to clonal differences in drought responses.