| 查看: 142 | 回复: 0 | |||
| 当前主题已经存档。 | |||
zhangjh069975银虫 (初入文坛)
|
[交流]
Disruption of the pollen-expressed FERONIA homologs
|
||
|
The precise delivery of male to female gametes during reproduction in eukaryotes requires complex signal exchanges and a flawless communication between male and female tissues. In angiosperms, molecular mechanisms have recently been revealed that are crucial for the dialog between male (pollen tube) and female gametophytes required for successful sperm delivery. When pollen tubes reach the female gametophyte, they arrest growth, burst and discharge their sperm cells. These processes are under the control of the female gametophyte via the receptor-like serine-threonine kinase (RLK) FERONIA (FER). However, the male signaling components that control the sperm delivery remain elusive. Here, we show that ANXUR1 and ANXUR2 (ANX1, ANX2), which encode the closest homologs of the FER-RLK in Arabidopsis, are preferentially expressed in pollen. Moreover, ANX1-YFP and ANX2- YFP fusion proteins display polar localization to the plasma membrane at the tip of the pollen tube. Finally, genetic analyses demonstrate that ANX1 and ANX2 function redundantly to control the timing of pollen tube discharge as anx1 anx2 doublemutant pollen tubes cease their growth and burst in vitro and fail to reach the female gametophytes in vivo. We propose that ANXRLKs constitutively inhibit pollen tube rupture and sperm discharge at the tip of growing pollen tubes to sustain their growth within maternal tissues until they reach the female gametophytes. Upon arrival, the female FER-dependent signaling cascade is activated to mediate pollen tube reception and fertilization, while male ANX-dependent signaling is deactivated, enabling the pollen tube to rupture and deliver its sperm cells to effect fertilization. |
回复此楼» 猜你喜欢
化工申博
已经有3人回复
-
申博自荐
已经有3人回复
-
化学工程及工业化学论文润色/翻译怎么收费?
已经有185人回复
-
广西民族大学化学化工学院化学工程与技术学硕，材料化工专硕调剂名额充足！
已经有0人回复
-
透明质酸酶的作用机制：如何实现药物递送
已经有0人回复
-
爱思维尔旗下LWT投稿
已经有9人回复
-
替拉扎明为缺氧选择性细胞毒药物研究提供新思路
已经有0人回复
-
拉坦前列腺素(Latanoprost)：前列腺素F2α衍生物如何成为青光眼一线用药
已经有0人回复
-
卟啉家族中的明星分子：MESO-四(3,5-二溴-4-羟基苯基)卟啉的性质与制备
已经有1人回复
-
宠物寄生虫防治：氟雷拉纳阻断GABA受体，持效12周驱杀跳蚤蜱虫
已经有0人回复
