Journal
JOURNAL OF INTEGRATIVE PLANT BIOLOGY
Volume 61, Issue 9, Pages 981-986Publisher
WILEY
DOI: 10.1111/jipb.12731
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Funding
- National Natural Science Foundation of China [31771547]
- Chinese National Special Grant for Transgenic Crops [2016ZX08009003-005]
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Arabidopsis contains five Brefeldin A-inhibited guanine nucleotide exchange factors (BIGs), which play a critical role in vesicle biogenesis for protein traffic from the Golgi to the plasma membrane. Biological processes regulated by BIG1-BIG4 are postulated to be distinct from those by BIG5. However, we show that the self-pollinated BIG1(+/-) big5 silique do not produce homozygous seeds, and some pollen tubes from BIG1(+/-) big5 anthers grew slowly in vitro and failed to target nearby ovules in vivo. We identified the big1 big5 homozygote from the progeny of BIG1(+/-) big5 plants transformed with BIG5, whose expression is driven by a pollen-specific promoter pLat52, indicating that male gametophyte transmission is blocked in the double mutant. Confocal microscopy indicated that BIG1 and BIG5 are co-localized in trans Golgi network. Thus, our data indicate that BIG1 and BIG5 are crucial for male gametophyte transmission.
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