PHENOTYPIC PLASTICITY OF SIZE-FECUNDITY RELATIONSHIPS IN ARABIDOPSIS-THALIANA
PHENOTYPIC PLASTICITY OF SIZE-FECUNDITY RELATIONSHIPS IN ARABIDOPSIS-THALIANA
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DOI：
10.2307/2261254
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发表时间：
1994-09-01
影响因子：
5.5
通讯作者：
AARSSEN, LW
中科院分区：
文献类型：
--
作者：
CLAUSS, MJ;AARSSEN, LW
1分生组织和资源的地上分配模式是植物生活史策略的主要组成部分，并反映在生殖力分配中，即观察到的植物大小和生殖力之间的关系。研究了一年生拟南芥生殖力分配的表型可塑性。三种基因型的每一种的个体在光照、养分和盆体积梯度下生长。在完全衰老时测量每个个体的植株大小（不包括种子的地上营养体）和繁殖力（种子数）。2在3种基因型和3种环境因子的所有组合中，繁殖力随着植株大小的增加而显著增加（P <0. 001）。这一增长通过线性、二次、三次和指数关系表示。与转换数据的协方差分析表明，大小-繁殖力的关系是可变的个体基因型和环境因素内的基因型之间的因素。因此，该物种不仅大小和繁殖力，而且大小和繁殖力之间的关系都可以表现出表型可塑性。3在光限制下，一些植物在整个生命周期中保持营养状态，因此可以确定启动生殖分生组织产生所需的最小大小。然而，一些相同基因型的个体在营养限制下开花并结实，尽管它们低于这个大小限制。因此，最小规模的生殖也可能表现出可塑性，拟南芥。观察到的变异性在最小尺寸的繁殖和繁殖力分配是不是由于发育阶段的变化，因为所有的植物都收获后，完全完成其发展。4表型可塑性在繁殖力分配和最小尺寸的繁殖意味着，植物相同的大小，在不同的环境中，可能不会有相同的繁殖力，即使它们是相同的基因型。这种可塑性在解释适应性估计和比较植物的生活史中具有重要意义。
1 The patterns of above ground allocation of meristems and resources are primary components of plant life history strategies, and are reflected in fecundity allocation, i.e. the observed relationship between plant size and fecundity. Phenotypic plasticity in fecundity allocation was investigated in the annual Arabidopsis thaliana. Individuals of each of three genotypes were grown under light, nutrient and pot volume gradients. Plant size (above ground vegetative mass excluding seeds) and fecundity (number of seeds) were measured for each individual at complete senescence.2 In all combinations of three genotypes and three environmental factors, fecundity increased significantly with increasing plant size (P < 0.001). This increase was expressed through linear, quadratic, cubic and exponential relationships. Analyses of covariance with transformed data indicated that size-fecundity relationships were variable both between factors for individual genotypes and between genotypes within environmental factors. Hence not only size and fecundity, but also the relationship between size and fecundity can display phenotypic plasticity in this species.3 Under light limitation some plants remained vegetative throughout their life span and it was therefore possible to identify a minimum size necessary to initiate production of reproductive meristems. However, some individuals of the same genotypes under nutrient limitation flowered and set seed although they were below this size limit. Hence, the minimum size for reproduction may also show phenotypic plasticity in A, thaliana. The observed variability in minimum size for reproduction and in fecundity allocation was not due to variation in developmental stage since all plants were harvested after fully completing their development.4 Phenotypic plasticity in fecundity allocation and minimum size for reproduction implies that plants of the same size, in different environments, may not have the same fecundity, even if they are the same genotype. This plasticity has important implications in the interpretation of fitness estimates and in comparisons of life histories in plants.