Nature of size-number trade-off: test of the terminal-stream- limitation model for seed production of Cardiocrium cordatum
Nature of size-number trade-off: test of the terminal-stream- limitation model for seed production of Cardiocrium cordatum
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DOI：
10.1111/j.0030-1299.2005.13232.x
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发表时间：
2005
期刊：
影响因子：
3.4
通讯作者：
S. Sakai;A. Sakai
中科院分区：
文献类型：
--
作者：
S. Sakai;A. Sakai
我们测试的终端流限制模型的预测，使用crocrium cordatum。该模型预测，总的后代质量增加与后代的数量，而它减少与后代的大小，因为通过维持呼吸的资源损失减少与后代的数量，但增加与后代的大小。我们跟踪种子的生长曲线，并在种子成熟时收获种子。种子的最大总生长速率对最终种子干质量有很强的正效应，而呼吸消耗对最终种子干质量有很强的负效应。由植物产生的总种子质量随着（或独立于）植物的平均种子干质量的增加而减少，而它随着植物产生的种子数量的增加而增加。种子数量的增加导致在种子生长过程中由于呼吸的资源损失减少，而在平均种子干质量的增加并没有导致由于呼吸的资源损失减少。因此，我们的结论是，这些结果是一致的整体与模型的预测，种子数量的增加，而不是增加单个种子大小是有利的资源利用效率。
We tested the prediction of the terminal-stream-limitation model using Cardiocrium cordatum. This model predicts that the total offspring mass increases with offspring number, whereas it decreases with offspring size, because the loss of resources via maintenance respiration decreases with offspring number but increases with offspring size. We traced the growth curve of seeds and harvested seeds when they matured. The maximum gross growth rate of a seed had a strong positive effect on final seed dry mass, whereas the respiration cost had a strong negative effect on such mass. The total seed mass produced by a plant decreased with (or was independent of) an increase in the mean seed dry mass of the plant, whereas it increased with an increase in the number of seeds produced by the plant. An increase in seed number resulted in a decrease in the loss of resources due to respiration during seed growth, whereas an increase in the mean seed dry mass did not result in a decrease in the loss of resources due to respiration. Thus, we concluded that these results are consistent overall with the prediction of the model and that an increase in seed number rather than an increase in individual seed size is advantageous in terms of resource use efficiency.