Fertilization recovery system is dependent on the number of pollen grains for efficient reproduction in plants.
Fertilization recovery system is dependent on the number of pollen grains for efficient reproduction in plants.
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DOI：
10.4161/psb.23690
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发表时间：
2013-04
影响因子：
2.9
通讯作者：
Higashiyama T
中科院分区：
文献类型：
--
作者：
Kasahara RD;Maruyama D;Higashiyama T
一个多世纪以来，植物受精一直被认为取决于单个花粉管的可育性。然而，我们最近报道了一个在开花植物中的“受精恢复系统”，该系统通过吸引第二个功能正常的花粉管来积极挽救有缺陷的突变花粉管的受精失败。在典型的开花植物中，卵细胞旁边的两个助细胞吸引花粉管，其中一个在花粉管排出时退化。我们观察到，当第二助细胞接受野生型花粉管时，受精被拯救。我们的结果表明，开花植物精确地控制到达每个胚珠的花粉管的数量，并使用受精恢复机制来最大限度地提高成功结实的可能性。限制授粉实验表明，如果提供足够的花粉粒，胚珠会吸引第二个花粉管进行恢复。这些结果支持我们之前的发现，即胚珠需要很长的时间才能完成系统。
For over a century, plant fertilization has been thought to depend on the fertility of a single pollen tube. However, we reported recently a “fertilization recovery system” in flowering plants that actively rescues failed fertilization of a defective mutant pollen tube by attracting a second, functional pollen tube. In typical flowering plants, two synergid cells beside the egg cell attract pollen tubes, one of which degenerates upon pollen tube discharge. We observed that fertilization was rescued when the second synergid cell accepted a wild-type pollen tube. Our results suggest that flowering plants precisely control the number of pollen tubes that arrive at each ovule and use a fertilization recovery mechanism to maximize the likelihood of successful seed set. Restricted pollination experiments showed that if sufficient pollen grains are provided, ovules attract a second pollen tube for recovery. These results support our previous finding that a long period of time is required for ovules to complete the system.