The Arabidopsis CrRLK1L protein kinases BUPS1 and BUPS2 are required for normal growth of pollen tubes in the pistil

The Plant Journal : for Cell and Molecular Biology
Lei ZhuDe Ye

Abstract

In flowering plants, the interaction of pollen tubes with female tissues is important for the accomplishment of double fertilization. Little information is known about the mechanisms that underlie signalling between pollen tubes and female tissues. In this study, two Arabidopsis pollen tube-expressed CrRLK1L protein kinases, Buddha's Paper Seal 1 (BUPS1) and BUPS2, were identified as being required for normal tip growth of pollen tubes in the pistil. They are expressed prolifically in pollen and pollen tubes and are localized on the plasma membrane of the pollen tube tip region. Mutations in BUPS1 drastically reduced seed set. Most of the bups1 mutant pollen tubes growing in the pistil exhibited a swollen pollen tube tip, leading to failure of fertilization. The bups2 pollen tubes had a slightly abnormal morphology but could still accomplish double fertilization. The bups1 bups2 double mutant exhibited a slightly enhanced phenotype compared to the single bups1 mutants. The BUPS1 proteins could form homomers and heteromers with BUPS2, whereas BUPS2 could only form heteromers with BUPS1. The BUPS proteins could interact with the Arabidopsis pollen-expressed RopGEFs in the yeast two-hybrid (Y2H) and bimolecular fluorescence comple...Continue Reading

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Citations

Jun 12, 2019·Plants·Nolan Scheible, Andrew McCubbin
Jul 21, 2020·The New Phytologist·Sofía C SomozaJorge P Muschietti
Mar 4, 2020·Plant Molecular Biology·Prakash B AdhikariRyushiro D Kasahara
Mar 2, 2019·Annual Review of Plant Biology·Mark A JohnsonRavishankar Palanivelu
Mar 18, 2020·Frontiers in Plant Science·Ming Jun ZhangXin-Qi Gao
Sep 27, 2020·Nature Communications·Yanyan HuangPing He
Jun 3, 2021·International Journal of Molecular Sciences·Lei ZhuLi-Qun Chen
Jun 7, 2021·Plant Physiology and Biochemistry : PPB·Jorge Solis-Miranda, Carmen Quinto

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