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| Open AccessThree types of genes underlying the Gametophyte factor1 locus cause unilateral cross incompatibility in maize
Unilateral cross incompatibility (UCI) is a type of prezygotic reproductive isolation, which is associated with multiple loci in maize. Here, the authors use genetic analysis to separate the Ga1 locus into two functional components and identify seven linked genes encoding three types of proteins.
- Yuebin Wang
- , Wenqiang Li
- & Jianbing Yan
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Article
| Open AccessROS homeostasis mediated by MPK4 and SUMM2 determines synergid cell death
Synergid cells undergo programmed cell death following pollen tube reception and successful fertilization. Here the authors show that premature synergid cell death is prevented by the mitogen activated protein kinase MPK4 and the R protein SUMM2 which maintain ROS homeostasis in Arabidopsis.
- Ronny Völz
- , William Harris
- & Yong-Hwan Lee
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Article
| Open AccessNitrogen nutrition contributes to plant fertility by affecting meiosis initiation
Nitrogen deficiency can cause floral abortion during reproductive development of rice. Here the authors show that when nitrogen is limited, rice plants require the ETFβ protein, which is involved in branched chain amino acid catabolism, to promote nitrogen reutilization and support the initiation of meiosis.
- Han Yang
- , Yafei Li
- & Zhukuan Cheng
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Article
| Open AccessSpecies-specific gamete recognition initiates fusion-driving trimer formation by conserved fusogen HAP2
HAP2 is essential for gamete fusion during fertilization and is conserved among eukaryotes. Here the authors show that species-specific adhesion between Chlamydomonas plus and minus gametes initiates HAP2 to undergo a fusogenic conformational change into homotrimers via a molecular mechanism akin to that of enveloped viruses.
- Jun Zhang
- , Jennifer F. Pinello
- & William J. Snell
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Article
| Open AccessMale fertility in Arabidopsis requires active DNA demethylation of genes that control pollen tube function
Active DNA demethylation is required for sexual reproduction in plants, but the underlying mechanisms are unknown. Here, the authors show that the DNA glycosylases DEMETER and REPRESSOR OF SILENCING 1 enable the DNA demethylation-dependent activation of genes involved in pollen tube progression.
- Souraya Khouider
- , Filipe Borges
- & Daniel Bouyer
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Article
| Open AccessDicer-like 5 deficiency confers temperature-sensitive male sterility in maize
Small RNAs act to regulate gene or transposon activity during plant development. Here, the authors show that maize Dicer-like 5 is required for 24-nt phased, secondary small interfering RNA production in anthers and that dicer-like 5 mutants show abnormal tapetal development and temperature-sensitive sterility.
- Chong Teng
- , Han Zhang
- & Virginia Walbot
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Article
| Open AccessAn asymmetric allelic interaction drives allele transmission bias in interspecific rice hybrids
Our limited understanding of the hybrid sterility (HS) mechanism in Asian–African rice hybrids hampers utilization of the interspecific heterosis for rice production. Here, the authors identify S1-mediated HS-related tripartite gamete killer-protector system, and explore their evolutionary relationship.
- Yongyao Xie
- , Jintao Tang
- & Letian Chen
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Article
| Open AccessGenus-wide sequencing supports a two-locus model for sex-determination in Phoenix
The origin and evolution of separate sexes in plants are long-standing questions. Here, the authors use genus-wide sequencing to identify sex determining candidate genes in the genus Phoenix and demonstrate the consistence with the previously proposed two-mutation model.
- Maria F. Torres
- , Lisa S. Mathew
- & Joel A. Malek
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Article
| Open AccessA PECTIN METHYLESTERASE gene at the maize Ga1 locus confers male function in unilateral cross-incompatibility
Unilateral cross-incompatibility between certain varieties of maize prevents cross-fertilization and can facilitate hybrid breeding. Here the authors show that a PECTIN METHYLESTERASE gene is able to overcome this reproductive barrier and confer fertility when expressed in pollen of the male parent.
- Zhaogui Zhang
- , Baocai Zhang
- & Huabang Chen
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Article
| Open AccessTriparental plants provide direct evidence for polyspermy induced polyploidy
The fertilization of an egg by more than one sperm is typically lethal. Here, via a novel reporter assay, Nakel et al. report the generation of triparental triploid Arabidopsis plants, implying that polyspermy is a plausible route toward polyploidy during plant evolution.
- Thomas Nakel
- , Dawit G. Tekleyohans
- & Rita Groß-Hardt
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Article
| Open AccessMale–female communication triggers calcium signatures during fertilization in Arabidopsis
Fertilization involves species-specific interaction and eventually fusion of two gametic cells, and calcium signalling plays a key role in this process. Here, the authors monitor the changes in intracellular calcium that take place during fertilization of flowering plants and point to specific signatures associated with specific steps of the process.
- Philipp Denninger
- , Andrea Bleckmann
- & Guido Grossmann
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Article
| Open AccessLive imaging of calcium spikes during double fertilization in Arabidopsis
Intracellular calcium waves are key signalling elements during the fertilization process of animals, involved in egg activation. Here the authors image calcium oscillations during the fertilization process in flowering plants, revealing specific signatures involved in the success of this process.
- Yuki Hamamura
- , Moe Nishimaki
- & Tetsuya Higashiyama
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Reactive oxygen species mediate pollen tube rupture to release sperm for fertilization in Arabidopsis
In plants, sperm is released from pollen tubes in order to fertilize the female gametophyte. In this study, Duan et al.demonstrate that NADPH generated reactive oxygen species are required for the female to induce rupture of the pollen tube.
- Qiaohong Duan
- , Daniel Kita
- & Alice Y. Cheung