Institute of Transformative Bio-Molecules (ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan; Division of Biological Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan; Institute for Advanced Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan; Temasek Life Sciences Laboratory and Department of Biological Sciences, National University of Singapore, Singapore 117604, Singapore.
Center for Plant Molecular Biology (ZMBP), University of Tübingen, 72076 Tübingen, Germany; Center for Desert Agriculture, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
Cell. 2015 May 7;161(4):907-18. doi: 10.1016/j.cell.2015.03.018. Epub 2015 Apr 23.
In flowering plants, fertilization-dependent degeneration of the persistent synergid cell ensures one-on-one pairings of male and female gametes. Here, we report that the fusion of the persistent synergid cell and the endosperm selectively inactivates the persistent synergid cell in Arabidopsis thaliana. The synergid-endosperm fusion causes rapid dilution of pre-secreted pollen tube attractant in the persistent synergid cell and selective disorganization of the synergid nucleus during the endosperm proliferation, preventing attractions of excess number of pollen tubes (polytubey). The synergid-endosperm fusion is induced by fertilization of the central cell, while the egg cell fertilization predominantly activates ethylene signaling, an inducer of the synergid nuclear disorganization. Therefore, two female gametes (the egg and the central cell) control independent pathways yet coordinately accomplish the elimination of the persistent synergid cell by double fertilization.
在开花植物中，受精依赖性的持久助细胞退化确保了雄配子和雌配子的一对一配对。在这里，我们报道了在拟南芥中，持久助细胞与胚乳的融合选择性地使持久助细胞失活。助细胞-胚乳的融合导致在胚乳增殖过程中，预先分泌的花粉管引诱物在持久助细胞中迅速稀释，并选择性地破坏助细胞核，从而防止过多数量的花粉管（polytubey）的吸引。助细胞-胚乳的融合是由中央细胞的受精诱导的，而卵细胞的受精主要激活乙烯信号转导，这是助细胞核解体的诱导剂。因此，两个雌性配子（卵细胞和中央细胞）控制独立的途径，但通过双受精协同完成持久助细胞的消除。
