Leaf density and chemical composition explain variation in leaf mass area with spectral composition among 11 widespread forbs in a common garden.
Leaf density and chemical composition explain variation in leaf mass area with spectral composition among 11 widespread forbs in a common garden.
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DOI：
10.1111/ppl.13512
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发表时间：
2021-07
影响因子：
6.4
通讯作者：
Qing-Wei Wang;Chenggang Liu;T. Robson;K. Hikosaka;H. Kurokawa
中科院分区：
文献类型：
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作者：
Qing-Wei Wang;Chenggang Liu;T. Robson;K. Hikosaka;H. Kurokawa
单位面积叶质量（LMA）是一个重要的叶功能性状，与植物的形态、生理和生化策略相关。虽然阳光通常被认为是驱动LMA的主导因素，但对阳光的每个光谱区域在形成LMA中的贡献知之甚少。本研究以11种分布广泛的杂类草为试材，在5种不同的光谱衰减处理下，分析了它们的叶片生长差异，如叶片密度（LD）、叶片厚度（LT）、常量元素和代谢物组成。95%的整个太阳光谱（> 280 nm），（2）衰减紫外线-B辐射（UV-B），（3）衰减UV-A和UV-B辐射，（4）衰减UV辐射和蓝光，（5）衰减UV辐射、蓝光和绿色光。我们发现，LMA，LD，和化学性状的变化显着不同的物种取决于光谱处理。UV-B辐射和绿色光显著增加了叶片的LMA，UV-A辐射增加了叶片的LD，而蓝光则降低了叶片的LD。LMA与LD在治疗中呈正相关，但与LT仅弱相关，表明LD是该特定治疗的LMA的更好确定因素。关于叶元素和代谢物组成，碳，氮，总酚类物质均呈正相关，而木质素，非结构性碳水化合物，可溶性糖与LMA呈负相关。这些趋势意味着生物量分配结构和代谢功能组件之间的权衡。总之，太阳光可以光谱驱动LMA主要是通过修改功能和结构的支持。
Leaf mass per area (LMA) is a key leaf functional trait correlated with plant strategies dictating morphology, physiology, and biochemistry. Although sunlight is generally accepted as a dominant factor driving LMA, the contribution of each spectral region of sunlight in shaping LMA is poorly understood. In the present study, we grew 11 widespread forb species in a common garden and dissected the traits underpinning differences in LMA, such as its morphological components (leaf density (LD), and leaf thickness (LT)), macroelement and metabolite composition under five spectral-attenuation treatments: (1) transmitting c. 95% of the whole solar spectrum (> 280 nm), (2) attenuating ultraviolet-B radiation (UV-B), (3) attenuating both UV-A and UV-B radiation, (4) attenuating UV radiation and blue light, (5) attenuating UV radiation, blue, and green light. We found that LMA, LD, and chemical traits varied significantly across species depending on spectral treatments. LMA was significantly increased by UV-B radiation and green light, while LD was increased by UV-A but decreased by blue light. LMA positively correlated with LD across treatments but was only weakly related to LT, suggesting that LD was a better determinate of LMA for this specific treatment. Regarding leaf elemental and metabolite composition, carbon, nitrogen, and total phenolics were all positively correlated with LMA, whereas lignin, non-structural carbohydrates, and soluble sugars had negative relationships with LMA. These trends imply a tradeoff between biomass allocation to structural and metabolically functional components. In conclusion, sunlight can spectrally drive LMA mainly through modifying functional and structural support.