Multilayered signaling pathways for pollen tube growth and guidance
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Sexual reproductive success is essential for the survival of all higher organisms. As the most prosperous and diverse group of land plants on earth, flowering plants evolved highly sophisticated fertilization mechanisms. To adapt to the terrestrial environment, a tubular structure pollen tube has been evolved to deliver the immobile sperm cells to the egg and central cell enclosed within the ovule. The pollen tube is generated from the vegetative cell of the pollen (male gametophyte), where two sperm cells are hosted. Pollen tube elongation in the maternal tissue and navigation to the ovule require intimate cell–cell interactions between the tube and female tissues. Questions on how the single-celled pollen tube accomplishes such task and how the female tissues accommodate the tube have attracted many plant biologists. Here, we review recent progresses and concepts in understanding the molecular mechanisms governing pollen tube growth and its interactions with the female tissues. We will also discuss the future perspective in this field.
KeywordsPollen tube Embryo sac Fertilization
This work is supported by the Grant from National Natural Science Foundation of China (31571385, 31622010 to H. L. and 31330053 to W. Y.).
Compliance with ethical standards
Conflict of interest
We declare that we have no conflicts of interest.
- Dai XR, Gao XQ, Chen GH, Tang LL, Wang H, Zhang XS (2014) ABNORMAL POLLEN TUBE GUIDANCE1, an endoplasmic reticulum-localized mannosyltransferase homolog of GLYCOSYLPHOSPHATIDYLINOSITOL10 in yeast and PHOSPHATIDYLINOSITOL GLYCAN ANCHOR BIOSYNTHESIS B in human, is required for Arabidopsis pollen tube micropylar guidance and embryo development. Plant Physiol 165:1544–1556CrossRefPubMedPubMedCentralGoogle Scholar
- Gao QF, Gu LL, Wang HQ, Fei CF, Fang X, Hussain J, Sun SJ, Dong JY, Liu H, Wang YF (2016) Cyclic nucleotide-gated channel 18 is an essential Ca2+ channel in pollen tube tips for pollen tube guidance to ovules in Arabidopsis. Proc Natl Acad Sci USA 113:3096–3101CrossRefPubMedPubMedCentralGoogle Scholar
- Ge Z, Bergonci T, Zhao Y, Zou Y, Du S, Liu MC, Luo X, Ruan H, García-Valencia LE, Zhong S, Hou S, Huang Q, Lai L, Moura DS, Gu H, Dong J, Wu HM, Dresselhaus T, Xiao J, Cheung AY, Qu LJ (2017) Arabidopsis pollen tube integrity and sperm release are regulated by RALF-mediated signaling. Science 358:1596–1600CrossRefPubMedGoogle Scholar
- Kaya H, Nakajima R, Iwano M, Kanaoka MM, Kimura S, Takeda S, Kawarazaki T, Senzaki E, Hamamura Y, Higashiyama T, Takayama S, Abe M, Kuchitsu K (2014) Ca2+-activated reactive oxygen species production by Arabidopsis RbohH and RbohJ is essential for proper pollen tube tip growth. Plant Cell 26:1069–1080CrossRefPubMedPubMedCentralGoogle Scholar
- Kim HU, Cotter R, Johnson S, Senda M, Dodds P, Kulikauska R, Tang W, Ezcura I, Herzmark P, McCormick S (2002) New pollen-specific receptor kinases identified in tomato, maize and Arabidopsis: the tomato kinases show overlapping but distinct localization patterns on pollen tubes. Plant Mol Biol 50:1–16CrossRefPubMedGoogle Scholar
- Liu J, Zhong S, Guo X, Hao L, Wei X, Hou Y, Shi J, Huang Q, Wang C, Gu H, Qu LJ (2013) Membrane-bound RLCKs LIP1 and LIP2 are essential male factors controlling male-female attraction in Arabidopsis. Curr Biol 23:1–6Google Scholar
- Mecchia MA, Santos-Fernandez G, Duss NN, Somoza SC, Boisson-Dernier A, Gagliardini V, Martínez-Bernardini A, Fabrice TN, Ringli C, Muschietti JP, Grossniklaus U (2017) RALF4/19 peptides interact with LRX proteins to control pollen tube growth in Arabidopsis. Science 358:1600–1603CrossRefPubMedGoogle Scholar
- Mizukami AG, Inatsugi R, Jiao J, Kotake T, Kuwata K, Ootani K, Okuda S, Sankaranarayanan S, Sato Y, Maruyama D, Iwai H, Garénaux E, Sato C, Kitajima K, Tsumuraya Y, Mori H, Yamaguchi J, Itami K, Sasaki N, Higashiyama T (2016) The AMOR arabinogalactan sugar chain induces pollen-tube competency to respond to ovular guidance. Curr Biol 26:1091–1097CrossRefPubMedGoogle Scholar
- Okuda S, Tsutsui H, Shiina K, Sprunck S, Takeuchi H, Yui R, Kasahara RD, Hamamura Y, Mizukami A, Susaki D, Kawano N, Sakakibara T, Namiki S, Itoh K, Otsuka K, Matsuzaki M, Nozaki H, Kuroiwa T, Nakano A, Kanaoka MM, Dresselhaus T, Sasaki N, Higashiyama T (2009) Defensin-like polypeptide LUREs are pollen tube attractants secreted from synergid cells. Nature 458:357–361CrossRefPubMedGoogle Scholar
- Xu Y, Yang J, Wang Y, Wang J, Yu Y, Long Y, Wang Y, Zhang H, Ren Y, Chen J, Wang Y, Zhang X, Guo X, Wu F, Zhu S, Lin Q, Jiang L, Wu C, Wang H, Wan J (2017) OsCNGC13 promotes seed-setting rate by facilitating pollen tube growth in stylar tissues. PLoS Genet 13:e1006906CrossRefPubMedPubMedCentralGoogle Scholar