欧亚国际

来自以色列的科学家发表了题为Role of guard-cell ABA in determining steady-state stomatal aperture and prompt vapor-pressure-deficit response的文章，文章发表于知名期刊Plant Science上。

Role of guard-cell ABA in determining steady-state stomatal aperture and prompt vapor-pressure-deficit response

Abstract

Abscisic acid (ABA) is known to be involved in stomatal closure. However, its role in stomatal response to rapid increases in the vapor pressure deficit (VPD) is unclear. To study this issue, we generated guard cell-specific ABA-insensitive Arabidopsis plants (guard-cell specific abi1-1; GCabi). Under non-stressed conditions, the stomatal conductance (gs) and apertures of GCabi plants were greater than those of control plants. This supports guard-cell ABA role as limiting steady-state stomatal aperture under non-stressful conditions. When there was a rapid increase in VPD (0.15 to 1 kPa), the gs and stomatal apertures of GCabi decreased in a manner similar that observed in the WT control, but different from that observed in WT plants treated with fusicoccin. Low VPD increased the size of the stomatal apertures of the WT, but not of GCabi. We conclude that guard-cell ABA does not play a significant role in the initial, rapid stomatal closure that occurs in response to an increase in VPD, but is important for stomatal adaptation to ambient VPD. We propose a biphasic angiosesperm VPD-sensing model that includes an initial ABA-independent phase and a subsequent ABA-dependent steady-state phase in which stomatal behavior is optimized for ambient VPD conditions.

Role of guard-cell ABA in determining steady-state stomatal aperture and prompt vapor-pressure-deficit response

A.Yaaran et. al., (2019) Plant Science DOI:10.1016/j.plantsci.2018.12.027