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- 검색키워드
- 주제어 : ABA-Induced stomatal closure (검색결과 3 건)
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Brassinosteroid reduces ABA accumulation leading to the inhibition of ABA-induced stomatal closure
Ha, Yun Mi,Shang, Yun,Yang, Dami,Nam, Kyoung Hee Elsevier 2018 Biochemical and biophysical research communication Vol.504 No.1
<P><B>Abstract</B></P> <P>Proper regulation of stomatal movement in response to various environmental stresses or developmental status is critical for the adaptation of many plant species to land. In plants, abscisic acid (ABA)-induced stomatal closure is a well-adapted method of regulating water status. In addition to ABA, we previously showed that plant-specific steroidal hormone, brassinosteroid (BR), also induces stomatal closure; however, BR modulates ABA-induced stomatal closure negatively at high concentrations. In this study, we further investigated the cross-talk between ABA and BR in relation to stomatal movement. In contrast to previous reports that ABA-induced stomatal closure was inhibited by brassinolide (BL), the most active BR, we showed that BL-induced stomatal closure was enhanced by ABA, indicating that the sequence of ABA or BL treatments led to different results. We found that this phenomenon occurred because the guard cells still had the capacity to be closed further by ABA, as the degree of stomatal closure by BL was always less than that by ABA. We also found that BL-induced stomatal closure required Open Stomata 1 (OST1) activity and the induced expression of <I>OST1</I> was indifferent to the sequence of ABA and/or BL treatments. In addition, we examined the underlying mechanism by which inhibition of ABA-induced stomatal closure by BL occurred. We revealed that the downregulation of ABA-biosynthetic genes by BL resulted in a lower accumulation of ABA. These results suggested that the regulation of stomatal movement is finely controlled by the combined effects of plant hormones, ABA and BR.</P> <P><B>Highlights</B></P> <P> <UL> <LI> ABA strengthened BL-induced stomatal closure. </LI> <LI> Expression of <I>OST1</I> was induced by BL, and BL-induced stomatal closure required OST1. </LI> <LI> Inhibition of ABA-induced stomatal closure by BR was due to reduced ABA accumulation. </LI> </UL> </P>
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Brassinosteroids modulate ABA-induced stomatal closure in Arabidopsis
Ha, Yunmi,Shang, Yun,Nam, Kyoung Hee Oxford University Press 2016 Journal of experimental botany Vol.67 No.22
<▼1><P><B>Highlight</B></P><P>Brassinosteroids alone promote stomatal closure, and in combination with ABA, they positively and negatively modulate ABA-induced stomatal closure in Arabidopsis.</P></▼1><▼2><P>Stomatal movement in response to water availability is an important physiological process in the survival of land plants. The plant hormone abscisic acid (ABA) and brassinosteroids (BRs) regulate stomatal closure. The physiological functions of ABA and BRs, including germination, cell elongation and stomatal movement, are generally known to be antagonistic. Here, we investigated how BRs affect stomatal movement alone and in combination with ABA. We demonstrate that brassinoslide (BL), the most active BR, promotes stomatal closure in an ABA-independent manner. Interestingly, BL also inhibited ABA-induced stomatal closure when a high concentration of BL was added to ABA. Furthermore, we found that the induction of some genes for reactive oxygen species (ROS) generation by ABA (<I>AtrbohD</I>, <I>NIA1</I> and <I>NIA2</I>) and subsequent ROS production were repressed by BL treatment. The BR signaling mutant <I>bri1-301</I> failed to inhibit ABA-induced stomatal closure upon BL treatment. However, <I>BRI1</I>-overexpressing transgenic plants were hypersensitive to ABA during stomatal closure, and BL reversed ABA-induced stomatal closure more completely than in wild type plants. Taken together, these results suggest that BRs can positively and negatively modulate ABA-induced stomatal closure. Therefore, interactions between ABA and BR signaling are important for the regulation of stomatal closure.</P></▼2>
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Shang, Y.,Dai, C.,Lee, M.,Kwak, June M.,Nam, K. Oxford University Press 2016 Molecular plant Vol.9 No.3
Stomatal movements are critical in regulating gas exchange for photosynthesis and water balance between plant tissues and the atmosphere. The plant hormone abscisic acid (ABA) plays key roles in regulating stomatal closure under various abiotic stresses. In this study, we revealed a novel role of BAK1 in guard cell ABA signaling. We found that the brassinosteroid (BR) signaling mutant bak1 lost more water than wild-type plants and showed ABA insensitivity in stomatal closure. ABA-induced OST1 expression and reactive oxygen species (ROS) production were also impaired in bak1. Unlike direct treatment with H<SUB>2</SUB>O<SUB>2</SUB>, overexpression of OST1 did not completely rescue the insensitivity of bak1 to ABA. We demonstrated that BAK1 forms a complex with OST1 near the plasma membrane and that the BAK1/OST1 complex is increased in response to ABA in planta. Brassinolide, the most active BR, exerted a negative effect on ABA-induced formation of the BAK1/OST1 complex and OST1 expression. Moreover, we found that BAK1 and ABI1 oppositely regulate OST1 phosphorylation in vitro, and that ABI1 interacts with BAK1 and inhibits the interaction of BAK1 and OST1. Taken together, our results suggest that BAK1 regulates ABA-induced stomatal closure in guard cells.
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