Heterotrimeric G protein α and β subunits antagonistically modulate stomatal density in Arabidopsis thaliana

Lingang Zhang, Guangzhen Hu, Yuxiang Cheng, Jirong Huang

    Research output: Contribution to journalArticlepeer-review

    63 Citations (Scopus)

    Abstract

    Stomata are essential for efficient gas and water-vapor exchange between the atmosphere and plants. Stomatal density and movement are controlled by a series of signal molecules including phytohormones and peptides as well as by environmental stimuli. It is known that heterotrimeric G-proteins play an important role in the ABA-inhibited stomatal opening. In this study, the G-protein signaling pathway was also found to regulate stomatal density on the lower epidermis of Arabidopsis cotyledons. The loss-of-function mutation of the G-protein α-subunit (GPA1) showed a reduction in stomatal density, while overexpression of the constitutively active form of GPA1QL increased stomatal density, indicating a positive role of the active form of GPA1 in stomatal development. In contrast, stomatal density increased in the null mutant of the G-protein β-subunit (AGB1) but decreased in transgenic lines that overexpressed AGB1. Stomatal analysis of the gpa1 agb1 double mutants displayed an average value of stomatal density compared to the single mutants. Taken together, these results suggest that the stomatal density in Arabidopsis is modulated by GPA1 and AGB1 in an antagonistic manner.

    Original languageEnglish
    Pages (from-to)68-75
    Number of pages8
    JournalDevelopmental Biology
    Volume324
    Issue number1
    DOIs
    Publication statusPublished - Dec 1 2008

    Keywords

    • Arabidopsis
    • Cotyledons
    • G-proteins
    • Signaling
    • Stomatal development

    ASJC Scopus subject areas

    • Molecular Biology
    • Developmental Biology
    • Cell Biology

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