Three 1-aminocyclopropane-1-carboxylate synthase genes regulated by primary and secondary pollination signals in orchid flowers

Plant Physiology
A Q Bui, S. D. O'Neill

Abstract

The temporal and spatial expression patterns of three 1-aminocyclopropane-1-carboxylate (ACC) synthase genes were investigated in pollinated orchid (Phalaenopsis spp.) flowers. Pollination signals initiate a cascade of development events in multiple floral organs, including the induction of ethylene biosynthesis, which coordinates several postpollination developmental responses. The initiation and propagation of ethylene biosynthesis is regulated by the coordinated expression of three distinct ACC synthase genes in orchid flowers. One ACC synthase gene (Phal-ACS1) is regulated by ethylene and participates in amplification and interorgan transmission of the pollination signal, as we have previously described in a related orchid genus. Two additional ACC synthase genes (Phal-ACS2 and Phal-ACS3) are expressed primarily in the stigma and ovary of pollinated orchid flowers. Phal-ACS2 mRNA accumulated in the stigma within 1 h after pollination, whereas Phal-ACS1 mRNA was not detected until 6 h after pollination. Similar to the expression of Phal-ACS2, the Phal-ACS3 gene was expressed within 2 h after pollination in the ovary. Exogenous application of auxin, but not ACC, mimicked pollination by stimulating a rapid increase in ACC synt...Continue Reading

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Citations

Apr 20, 2013·Journal of Experimental Botany·Daofeng LiuJunping Gao
Apr 26, 2005·Plant Physiology·Beverly A UnderwoodDavid G Clark
Mar 11, 2004·The Plant Cell·Ana Maria SanchezCelestina Mariani
Jun 1, 1997·Annual Review of Plant Physiology and Plant Molecular Biology·Sharman D. O'Neill
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Nov 2, 2013·Planta·Waseem Shahri, Inayatullah Tahir
Aug 20, 2014·Journal of Experimental Botany·Wouter G van Doorn, Chanattika Kamdee
Dec 4, 2015·Biochemical and Biophysical Research Communications·Le-Song Shi, Jin-Ping Liu
Dec 9, 2014·Plant Signaling & Behavior·Stacey D NovakRoshan N Gamage
Jun 20, 2014·The Plant Journal : for Cell and Molecular Biology·Yonglu MengJunping Gao
Nov 1, 2007·Plant Signaling & Behavior·Siddharth Kaushal Tripathi, Narendra Tuteja
Feb 10, 2018·Journal of Experimental Botany·Nan MaJunping Gao
May 22, 2016·Plant Physiology·Chengzhen SunXiaolan Zhang

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