基因组大小
基因组
单元格大小
生物
光合作用
生态学
航程(航空)
进化生物学
基因
植物
遗传学
细胞生物学
复合材料
材料科学
作者
Adam B. Roddy,Guillaume Théroux-Rancourt,Tito Abbo,Craig R. Brodersen,Brook Jensen,Guo-Feng Jiang,R. Alexander Thompson,Sara E. Kuebbing,Kevin A. Simonin
摘要
Abstract A central challenge in plant ecology is to define the major axes of plant functional variation with direct consequences for fitness. Central to the three main components of plant fitness (growth, survival, and reproduction) is the rate of metabolic conversion of CO 2 into carbon that can be allocated to various structures and functions. Here we (1) argue that a primary constraint on the maximum rate of photosynthesis per unit leaf area is the size and packing density of cells and (2) show that variation in genome size is a strong predictor of cell sizes, packing densities, and the maximum rate of photosynthesis across terrestrial vascular plants. Regardless of the genic content associated with variation in genome size, the simple biophysical constraints of encapsulating the genome define the lower limit of cell size and the upper limit of cell packing densities, as well as the range of possible cell sizes and densities. Genome size, therefore, acts as a first-order constraint on carbon gain and is predicted to define the upper limits of allocation to growth, reproduction, and defense. The strong effects of genome size on metabolism, therefore, have broad implications for plant biogeography and for other theories of plant ecology, and suggest that selection on metabolism may have a role in genome size evolution.
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