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Angiosperm reproductive development is a complex event that includes floral organ development, male and female gametophyte formation and interaction between the male and female reproductive organs for successful fertilization. Previous studies have revealed the redundant function of ATP binding cassette subfamily G (ABCG) transporters ABCG1 and ABCG16 in pollen development, but whether they are involved in other reproductive processes is unknown. Here we show that ABCG1 and ABCG16 were not only expressed in anthers and stamen filaments but also enriched in pistil tissues, including the stigma, style, transmitting tract and ovule. We further demonstrated that pistil-expressed ABCG1 and ABCG16 promoted rapid pollen tube growth through their effects on auxin distribution and auxin flow in the pistil. Moreover, disrupted auxin homeostasis in stamen filaments was associated with defective filament elongation. Our work reveals the key functions of ABCG1 and ABCG16 in reproductive development and provides clues for identifying ABCG1 and ABCG16 substrates in Arabidopsis. © 2020 The Authors. The Plant Journal © 2020 John Wiley & Sons Ltd.

Citation

Liping Liu, Lihua Zhao, Piaojuan Chen, Hanyang Cai, Zhimin Hou, Xingyue Jin, Mohammad Aslam, Mengnan Chai, Linyi Lai, Qing He, Yanhui Liu, Xiaoyi Huang, Huihuang Chen, Yingzhi Chen, Yuan Qin. ATP binding cassette transporters ABCG1 and ABCG16 affect reproductive development via auxin signalling in Arabidopsis. The Plant journal : for cell and molecular biology. 2020 Jun;102(6):1172-1186

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PMID: 31944421

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