EVIDENCE FOR SELECTIVE EMBRYO ABORTION IN CRYPTANTHA-FLAVA
EVIDENCE FOR SELECTIVE EMBRYO ABORTION IN CRYPTANTHA-FLAVA
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DOI：
10.1086/284855
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发表时间：
1988-09-01
影响因子：
2.9
通讯作者：
CASPER, BB
中科院分区：
文献类型：
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作者：
CASPER, BB
在每一子房中，四个胚珠中的三个通常不能发育，即使它们都可以受精。我测试了这样一种假设，即具有更旺盛胚胎的胚珠会有选择地成熟。在受精后，在胚珠败育之前，随机选择的三个胚珠在1970朵(实验)花中每朵被破坏。这些花产生的后代的表现与对照花的后代的表现进行了比较，在对照花中，四个胚珠中的任何一个都可以发育。在对照花中，当一个胚珠刚刚比其他胚珠大时，其他三个胚珠就被破坏了。这两种处理产生的种子都被种植在田野中几个地点的源植物附近。通过两个生长季节对出苗、幼苗存活和苗木大小进行监测。试验处理产生的种子出苗率低于对照种子，但第一年的幼苗存活率没有显著差异。在这两年中，控制组从种植中获得的总体存活率更高。每一年的株高和每株叶片数在不同的处理之间没有差异。对于所有成功的衡量标准，不同地点之间存在显著差异，对于一些地点之间的显著治疗交互作用。这一结果与高质量胚胎的选择性成熟是一致的，但也给出了不同的解释。
In each ovary of Cryptantha flava, three of the four ovules usually fail to develop, even though all of them may be fertilized. I tested the hypothesis that ovules with more-vigorous embryos selectively mature. Following fertilization but before ovule abortion, three arbitrarily selected ovules were destroyed in each of 1970 (experimental) flowers. The performance of offspring produced by these flowers was compared with the performance of offspring from control flowers in which any one of the four ovules could develop. In the control flowers, when one ovule was just larger than the others, the other three ovules were destroyed. The seeds resulting from both treatments were planted near their source plants at several locations in the field. Emergence, seedling survival, and seedling size were monitored through two growing seasons. Less emergence occurred in seeds produced by the experimental treatment than in control seeds, but seedling survival during the first year did not differ significantly. Overall survival from planting was greater for the controls in both years. Plant height and the number of leaves per plant did not differ between treatments for either year. For all measures of success, there were significant differences among sites and, for some, significant treatment-by-site interactions. The results are consistent with the selective maturation of higher-quality embryos, but alternative explanations are also given.