ALLOMETRY OF WITHIN-FRUIT REPRODUCTIVE ALLOCATION IN SUBTROPICAL DICOT WOODY SPECIES
ALLOMETRY OF WITHIN-FRUIT REPRODUCTIVE ALLOCATION IN SUBTROPICAL DICOT WOODY SPECIES
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DOI：
10.3732/ajb.0900204
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发表时间：
2010-04-01
影响因子：
3
通讯作者：
Sun, Shucun
中科院分区：
文献类型：
--
作者：
Chen, Hong;Felker, Sara;Sun, Shucun
被子植物果实通常由果皮和种子组成，它们共同发挥作用以最大限度地提高植物繁殖成功率。尽管水果内生殖分配对于理解水果大小和种子大小的演变至关重要，但几乎没有对各种水果类型和分类单元进行研究。我们调查了中国西南亚热带常绿森林的 62 种双子叶木本植物（27 种落叶树种和 35 种常绿树种）的种子大小、果实大小、每个果实的种子数 (SNF) 以及果实内种子质量和果皮质量之间的生物量分配。在果实水平上，常绿物种和汇总数据集中，果皮总质量 (TPM) 随着种子总质量 (TSM) 的增加而等轴缩放，而落叶物种中 TPM 的增加速度快于 TSM。斜率差异可能是由于两个物种组之间果实发育时间的差异所致。在种子水平上，落叶组中种子包（每粒种子的果皮质量）随着种子大小的增加而等距缩放，但在常绿植物和汇总数据集中小于等距缩放。 SNF 与种子大小负相关，但与果实内果皮的比例正相关。总之，落叶树种和常绿树种的果内生物量分配均受到种子大小、果实大小和 SNF 的显着影响。讨论了观察到的缩放关系与种子大小演变和种子大小变化的全局模式的关系。
Angiosperm fruits typically consist of pericarp and seed, which collectively function to maximize plant reproductive success. Within-fruit reproductive allocation has been scarcely examined across a wide range of fruit types and taxa although it is critical to the understanding of the evolution of fruit size and seed size. We investigated seed size, fruit size, seed number per fruit (SNF), and within-fruit biomass allocation between seed mass and pericarp mass for 62 dicot woody species (27 deciduous and 35 evergreen species) of a subtropical evergreen forest in southwest China. At the fruit level, total pericarp mass (TPM) isometrically scaled with increasing total seed mass (TSM) in the evergreen species and in the pooled data set, while TPM increased faster than TSM in the deciduous species. The slope difference is possibly due to the difference in the timing of fruit development between the two species groups. At the seed level, seed package (pericarp mass per seed) isometrically scaled with increasing seed size in the deciduous group, but less than isometrically in the evergreens and in the pooled data set. SNF was negatively correlated with seed size but positively correlated with the proportion of pericarp within fruits. In conclusion, within-fruit biomass allocation is significantly affected by seed size, fruit size, and SNF in both deciduous and evergreen species. The implications of the observed scaling relationships are discussed in relation to seed size evolution and global patterns of seed size variation.