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Higher needle anatomic plasticity is related to better water-use efficiency and higher resistance to embolism in fast-growing Pinus pinaster families under water scarcity
Trees ( IF 2.3 ) Pub Date : 2020-09-24 , DOI: 10.1007/s00468-020-02034-2
D. Bert , G. Le Provost , S. Delzon , C. Plomion , J.-M. Gion

Key Message

Needle anatomic plasticity enables fast-growing maritime pine trees to cope with water limitations by enhancing both water-use efficiency and embolism resistance.

Abstract

Maritime pine is a major forest tree grown for wood production in Southern Europe. A breeding program for the selection of fast-growing varieties was established in the 1960s, in France. In the context of climate change, the magnitude of phenotypic plasticity is a key issue for the prediction of putative decreases in productivity in the improved genetic material. We characterized the phenotypic plasticity of anatomical and physiological traits in two families with contrasting growth rates, under different water regimes, at the juvenile stage. An analysis of 38 traits showed that the fastest growing family had the greatest phenotypic plasticity for morphological, anatomic, chemical and physiological traits, enabling it to increase its water use efficiency and embolism resistance in response to water deficit. The observed modifications to the extravascular (proportion of spongy parenchyma in needles) and vascular (xylem in the needles and stem) compartments in response to water constraints were consistent with a higher water use efficiency and greater embolism resistance. The ability to optimize meresis and auxesis according to environmental conditions during needle development could be related to growth performance over time in different environmental conditions. These results suggest that selection for growth in maritime pine leads to the selection of individuals with greater phenotypic plasticity related to higher performances in non-limited conditions.



中文翻译:

在缺水的情况下,快速增长的松属针叶树家庭较高的针解剖可塑性与更好的用水效率和更高的抗栓塞性有关

关键信息

针状解剖可塑性通过提高用水效率和抗栓塞性,使快速生长的海上松树能够应对水的限制。

抽象

海上松是南欧主要用于木材生产的林木。1960年代,法国制定了育种计划,以选择快速生长的品种。在气候变化的背景下,表型可塑性的大小是预测改良遗传物质生产力可能下降的关键问题。我们在不同的水分制度下,在幼年期对两个家庭的解剖和生理特征的表型可塑性进行了表征,并得出了不同的增长率。对38个性状的分析表明,生长最快的家族在形态,解剖,化学和生理性状方面具有最大的表型可塑性,从而能够提高水分利用效率和抗缺水性。观察到的对水分限制的响应,对血管外(针状海绵状组织的比例)和血管(针状和茎状木质部)部分的改变与更高的用水效率和更大的抗栓塞性相一致。在针头开发过程中根据环境条件优化绒毛和贴皮的能力可能与不同环境条件下随时间的生长性能有关。这些结果表明,对于海洋松生长的选择导致选择具有更大表型可塑性的个体,这与在非限制性条件下的更高性能有关。

更新日期:2020-09-24
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