Testing trait plasticity over the range of spectral composition of sunlight in forb species differing in shade tolerance
Testing trait plasticity over the range of spectral composition of sunlight in forb species differing in shade tolerance
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DOI：
10.1111/1365-2745.13384
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发表时间：
2020-04
影响因子：
5.5
通讯作者：
Qing-Wei Wang;T. Robson;Marta Pieristè;Michio Oguro;R. Oguchi;Y. Murai;H. Kurokawa
中科院分区：
文献类型：
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作者：
Qing-Wei Wang;T. Robson;Marta Pieristè;Michio Oguro;R. Oguchi;Y. Murai;H. Kurokawa
虽然阳光是必不可少的植物生长和发育，每个光谱区域在塑造功能性状的相对重要性知之甚少，特别是在动态光环境，如森林生态系统。我们研究了25个功能性状的反应，从11个不耐荫和12个林下耐荫的杂类草种在5个不同的光谱透射率的过滤器处理室外生长：（a）传输c。95%的太阳辐射（280-800 nm）;（B）衰减紫外-B（UV-B）;（c）衰减所有UV;（d）衰减所有UV和蓝光;（e）衰减所有UV、蓝光和绿色光。我们的研究结果表明，紫外B辐射主要影响生化性状，但蓝光主要影响生理性状，而绿色光影响两组性状。这将表明，根据光的质量进行功能性状反应套件之间的分化。在不耐荫的物种中，UV-A辐射显著增加了生物量积累（对比处理[B] vs. [c]），但在耐荫的物种中，蓝光降低了生物量积累;根据功能组，绿色和红光对全株形态发育的影响不同。耐荫的物种比不耐荫的物种对我们检查的每个光谱区域（除了UV B辐射）的响应更具可塑性。合成.我们的研究结果表明，太阳光的光谱组成的差异可以驱动功能性状的表达，而不管收到的总辐照度。不同功能类群对功能性状的不同反应表明，耐荫和不耐荫物种在各自的光环境中已经适应了不同的光谱线索。
Although sunlight is essential for plant growth and development, the relative importance of each spectral region in shaping functional traits is poorly understood, particularly in dynamic light environments such as forest ecosystems. We examined responses of 25 functional traits from groups of 11 shade‐intolerant and 12 understorey shade‐tolerant forb species grown outdoors under five filter treatments differing in spectral transmittance: (a) transmitting c. 95% of solar radiation (280–800 nm); (b) attenuating ultraviolet‐B (UV‐B); (c) attenuating all UV; (d) attenuating all UV and blue light; (e) attenuating all UV, blue and green light. Our results show that UV‐B radiation mainly affected the biochemical traits but blue light mainly affected the physiological traits irrespective of functional strategy, whereas green light affected both sets of traits. This would suggest that differentiation among suites of functional trait responses proceeds according to light quality. Biomass accumulation was significantly increased by UV‐A radiation (contrasting treatment [b] vs. [c]) among shade‐intolerant but decreased by blue light among shade‐tolerant species; green and red light affected whole‐plant morphological development differently according to functional groups. Shade‐tolerant species were more plastic than shade‐intolerant species in response to each spectral region that we examined except for UV‐B radiation. Synthesis. Our results show that differences in the spectral composition of sunlight can drive functional trait expression irrespective of total irradiance received. The different responses of functional traits between functional groups imply that shade‐tolerant and intolerant species have adapted to utilize spectral cues differently in their respective light environments.