College of Life Science, Sichuan Normal University, Chengdu, China.
Institute of Wetland Ecology & Clone Ecology/Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, China.
PLoS One. 2021 Oct 11;16(10):e0258253. doi: 10.1371/journal.pone.0258253. eCollection 2021.
Current knowledge on responses of aquatic clonal plants to resource availability is largely based on studies manipulating limited resource levels, which may have failed to capture the "big picture" for aquatic clonal plants in response to resource availability. In a greenhouse experiment, we grew the floating clonal plant Spirodela polyrhiza under ten nutrient levels (i.e., 1/64×, 1/32×, 1/16×, 1/8×, 1/4×, 1/2×, 1×, 2×, 4× and 8×full-strength Hoagland solution) and examined their responses in terms of clonal growth, morphology and biomass allocations. The responses of total biomass and number of ramets to nutrient availability were unimodal. A similar pattern was found for frond mass, frond length and frond width, even though area per frond and specific frond area fluctuated greatly in response to nutrient availability. In contrast, the responses of root mass and root length to nutrient availability were U-shaped. Moreover, S. polyrhiza invested more to roots under lower nutrient concentrations. These results suggest that nutrient availability may have distinct influences on roots and fronds of the aquatic clonal plant S. polyrhiza, resulting in a great influence on the whole S. polyrhiza population.
目前，关于水生克隆植物对资源可利用性的反应的知识主要基于操纵有限资源水平的研究，这些研究可能未能捕捉到水生克隆植物对资源可利用性的“全貌”。在温室实验中，我们在十种养分水平（即 1/64×、1/32×、1/16×、1/8×、1/4×、1/2×、1×、2×、4×和 8×倍全强度 Hoagland 溶液）下种植漂浮的克隆植物满江红，并从克隆生长、形态和生物量分配方面来研究它们对养分可利用性的反应。总生物量和分株数量对养分可用性的反应呈单峰型。尽管每片叶子的面积和特定叶子面积因养分可用性而波动很大，但叶子质量、叶子长度和叶子宽度的反应模式也相似。相比之下，根质量和根长度对养分可用性的反应呈 U 型。此外，满江红在较低养分浓度下向根部投入更多。这些结果表明，养分可用性可能对水生克隆植物满江红的根和叶子有明显的影响，从而对整个满江红种群产生巨大的影响。
