J Integr Plant Biol

Plant reproduction: Recent discoveries from China

Li-Jia Qu, and Meng-Xiang Sun

2017, 59(9): 591-593. doi:10.1111/jipb.12576

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Arabidopsis adaptor protein 1G is critical for pollen development

Chong Feng, Jia-Gang Wang, Hai-Hong Liu, Sha Li, and Yan Zhang

2017, 59(9): 594-599. doi:10.1111/jipb.12556

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AP1G, adaptor protein 1, is essential for protein sorting at the trans-Golgi network/early endosomes. This study demonstrates that functional loss of the γ subunit of AP1G resulted in male gametophytic lethality by affecting vacuolar remodeling and acidification during pollen development.

The signals to trigger the initiation of ovule enlargement are from the pollen tubes: The direct evidence

Sheng Zhong, Jun Zhang, and Li-Jia Qu

2017, 59(9): 600-603. doi:10.1111/jipb.12577

摘要 ( 694 )

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Seed size is an important trait of higher plants, especially of crops that are food resources for humans. Ovule enlargement is the start of seed size expansion. We find that the signal to trigger ovule enlargement comes from the pollen tube, not from the sperm cells, or from fertilization.

Arabidopsis shaker pollen inward K⁺ channel SPIK functions in SnRK1 complex-regulated pollen hydration on the stigma

Dan-Dan Li, Huan Guan, Fei Li, Chang-Zhen Liu, Yu-Xiu Dong, Xian-Sheng Zhang and Xin-Qi Gao

2017, 59(9): 604-611. doi:10.1111/jipb.12563

摘要 ( 713 )

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Pollen hydration is a critical step that determines pollen germination on the stigma. In this study, we found that Arabidopsis SnRK1 complex regulates the expression of SPIK, a plasma membrane-localized K⁺ channel, which functions in mediating pollen hydration on the surface of the stigma.

The polyketide synthase OsPKS2 is essential for pollen exine and Ubisch body patterning in rice

Xiaolei Zhu, Jing Yu, Jianxin Shi, Takayuki Tohge, Alisdair R. Fernie, Sagit Meir, Asaph Aharoni, Dawei Xu, Dabing Zhang, and Wanqi Liang

2017, 59(9): 612-628. doi:10.1111/jipb.12574

摘要 ( 683 )

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The pollen exine is sculptured in a genetically determined manner, but the mechanism controlling exine pattern formation remains unclear. This study demonstrated that a rice polyketide synthase OsPKS2 plays an important role in exine patterning. Mutation in OsPKS2 leads to dramatic changes in pollen exine morphology but does not significantly affect sporopollenin production.

SNAIL1 is essential for female gametogenesis in Arabidopsis thaliana

Lihong Hao, Xiaolin Wei, Jiulei Zhu, Jiao Shi, Jingjing Liu, Hongya Gu, Tomohiko Tsuge, and Li-Jia Qu

2017, 59(9): 629-641. doi:10.1111/jipb.12572

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The coordinated development of female gametophytes is important for plant sexual reproduction. Yeast proteins Ssf1 and Ssf2, involved in ribosome biogenesis, are essential for yeast cell viability. Here we characterized SNAIL1, the Arabidopsis counterpart of them, is required for the synchronous development during female gametogenesis by affecting protein synthesis.

Acetylglutamate kinase is required for both gametophyte function and embryo development in Arabidopsis thaliana

Jie Huang, Dan Chen, Hailong Yan, Fei Xie, Ying Yu, Liyao Zhang, Mengxiang Sun and Xiongbo Peng

2017, 59(9): 642-656. doi:10.1111/jipb.12536

摘要 ( 1184 )

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Arabidopsis thaliana N-acetylglutamate kinase (NAGK) was identified as a functional homolog of Escherichia coli NAGK for catalyzing the second step of arginine biosynthesis. Loss-of-function of NAGK decreased pollen tubes' growth rate, affected female gametophyte cell fate and showed an embryonic lethal phenotype.

A reciprocal inhibition between ARID1 and MET1 in male and female gametes in Arabidopsis

Lei Li, Wenye Wu, Youshang Zhao and Binglian Zheng

2017, 59(9): 657-668. doi:10.1111/jipb.12573

摘要 ( 710 )

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DNA methylation is usually down-regulated in companion cells of plant gametes, in which either DNA methytransferases are repressed and/or DNA demethylases are locally increased. This work identified an Arabidopsis transcription factor ARID1 (AT-Rich Interacting Domain 1), which reciprocally regulates MET1, a major CG DNA methyltransferase, during plant gametophyte development.

Suppression or knockout of SaF/SaM overcomes the Sa-mediated hybrid male sterility in rice

Yongyao Xie, Baixiao Niu, Yunming Long, Gousi Li, Jintao Tang, Yaling Zhang, Ding Ren, Yao-Guang Liu, and Letian Chen

2017, 59(9): 669-679. doi:10.1111/jipb.12564

摘要 ( 850 )

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Hybrid sterility is a major obstacle to utilization hybrid vigor. Here, we demonstrate effective ways to overcome the Sa-mediated indica-japonica hybrid male sterility in rice by knocking out/down of SaF/SaM genes, or using natural Sa-neutral alleles.

ZYGOTE-ARREST 3 that encodes the tRNA ligase is essential for zygote division in Arabidopsis

Ke-Jin Yang, Lei Guo, Xiu-Li Hou, Hua-Qin Gong, and Chun-Ming Liu

2017, 59(9): 680-692. doi:10.1111/jipb.12561

摘要 ( 2012 )

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The Arabidopsis zyg3 mutant exhibits a tight zygote-lethal phenotype. ZYG3, expressed in zygote and developing embryos, encodes a tRNA ligase which is essential for the splicing of tRNA^Tyr and elongator tRNA^Met, suggesting the critical role of tRNA splicing in the initiation of zygote divisions in plants.

Regulatory network and genetic interactions established by OsMADS34 in rice inflorescence and spikelet morphogenesis

Qingcai Meng, Xiaofeng Li, Wanwan Zhu, Li Yang, Wanqi Liang, Ludovico Dreni, and Dabing Zhang

2017, 59(9): 693-707. doi:10.1111/jipb.12594

摘要 ( 496 )

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The inflorescence structure is a key determinant of yield in crops. The MADS-box transcription factor OsMADS34 is known to regulate both inflorescence branching and spikelet morphogenesis in rice. Here, we provide new insights into the genetic interactions and the downstream regulatory network established by OsMADS34.

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