Compensatory mechanisms mitigate the effect of warming and drought on wood formation
Compensatory mechanisms mitigate the effect of warming and drought on wood formation
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DOI：
10.1111/pce.12689
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发表时间：
2016-06-01
影响因子：
7.3
通讯作者：
Rossi, Sergio
中科院分区：
文献类型：
--
作者：
Balducci, Lorena;Cuny, Henri E.;Rossi, Sergio
由于全球变暖，预计高纬度生态系统将经历气温上升和干旱事件。木材的形成将不得不适应这些新的气候限制，以保持树木的机械稳定性和长距离的水运输。本研究的目的是了解在温暖和干旱条件下木材形成的动态过程。黑云杉[Piceamariana（Mill.）B.S.P.在温室实验期间监测树苗，其中在白天或夜间（+6 ℃）温度升高并结合干旱期。管胞发育的动力学表示为速率和持续时间的木质化子过程中使用广义加性模型进行量化。干旱和升温对细胞生成量影响较大，但对木材解剖结构影响不大。在较温暖的温度下，特别是在生长季节结束时的夜间变暖期间，细胞生产率的增加导致了更宽的树木年轮。然而，细胞分化过程的速率和持续时间之间的强补偿减轻了变暖和干旱对树木年轮结构的影响。我们的研究结果允许量化木材形成动力学是如何调节时，水和热应力增加，使树木适应未来的环境条件。
Because of global warming, high-latitude ecosystems are expected to experience increases in temperature and drought events. Wood formation will have to adjust to these new climatic constraints to maintain tree mechanical stability and long-distance water transport. The aim of this study is to understand the dynamic processes involved in wood formation under warming and drought. Xylogenesis, gas exchange, water relations and wood anatomy of black spruce [Picea mariana (Mill.) B.S.P.] saplings were monitored during a greenhouse experiment where temperature was increased during daytime or night-time (+ 6 degrees C) combined with a drought period. The kinetics of tracheid development expressed as rate and duration of the xylogenesis sub-processes were quantified using generalized additive models. Drought and warming had a strong influence on cell production, but little effect on wood anatomy. The increase in cell production rate under warmer temperatures, and especially during the night-time warming at the end of the growing season, resulted in wider tree-rings. However, the strong compensation between rates and durations of cell differentiation processes mitigates warming and drought effects on tree-ring structure. Our results allowed quantification of how wood formation kinetics is regulated when water and heat stress increase, allowing trees to adapt to future environmental conditions.