Exocytosis-coordinated mechanisms for tip growth underlie pollen tube growth guidance

Nan Luo, An Yan, Gang Liu, Jingzhe Guo, Duoyan Rong, Masahiro M. Kanaoka, Zhen Xiao, Guanshui Xu, Tetsuya Higashiyama, Xinping Cui and Zhenbiao Yang ()
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Nan Luo: Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou
An Yan: University of California, Riverside
Gang Liu: University of California, Riverside
Jingzhe Guo: Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou
Duoyan Rong: University of California, Riverside
Masahiro M. Kanaoka: Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku
Zhen Xiao: University of California, Riverside
Guanshui Xu: University of California, Riverside
Tetsuya Higashiyama: Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku
Xinping Cui: University of California, Riverside
Zhenbiao Yang: Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Many tip-growing cells are capable of responding to guidance cues, during which cells precisely steer their growth toward the source of guidance signals. Though several players in signal perception have been identified, little is known about the downstream signaling that controls growth direction during guidance. Here, using combined modeling and experimental studies, we demonstrate that the growth guidance of Arabidopsis pollen tubes is regulated by the signaling network that controls tip growth. Tip-localized exocytosis plays a key role in this network by integrating guidance signals with the ROP1 Rho GTPase signaling and coordinating intracellular signaling with cell wall mechanics. This model reproduces the high robustness and responsiveness of pollen tube guidance and explains the connection between guidance efficiency and the parameters of the tip growth system. Hence, our findings establish an exocytosis-coordinated mechanism underlying the cellular pathfinding guided by signal gradients and the mechanistic linkage between tip growth and guidance.

Date: 2017
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DOI: 10.1038/s41467-017-01452-0

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