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| 1 | Counteraction of ABA-Mediated Inhibition of Seed Germination and Seedling Establishment by ABA Signaling Terminator in Arabidopsis显示文摘Seed germination and seedling establishment are important for the reproductive success of plants,but seeds and seedlings typically encounter constantly changing environmental conditions.By inhibiting seed germination and post-germinative growth through the PYR1/PYL/RCAR ABA receptors and PP2C co-receptors,the phytohormone abscisic acid(ABA)prevents premature germination and seedling growth under unfavorable conditions.However,little is known about how the ABA-mediated inhibition of seed germination and seedling establishment is thwarted.Here,we report that ABA Signaling Terminator(ABT),a WD40 protein,efficiently switches off ABA signaling and is critical for seed germination and seedling establishment.ABT is induced by ABA in a PYR1/PYL/RCAR-PP2C-dependent manner.Overexpression of ABT promotes seed germination and seedling greening in the presence of ABA,whereas knockout of ABT has the opposite effect.We found that ABT interacts with the PYR1/PYL/RCAR and PP2C proteins,interferes with the interaction between PYR1/PYL4 and ABI1/ABI2,and hampers the inhibition of ABI1/ABI2 by ABA-bound PYR1/PYL4,thereby terminating ABA signaling.Taken together,our results reveal a core mechanism of ABA signaling termination that is critical for seed germination and seedling establishment in Arabidopsis. | Zhijuan Wang Ziyin Ren Chunhong Cheng Tao Wang Hongtao Ji Yang Zhao Zhiping Deng Liya Zhi Jingjing Lu Xinying Wu Shimin Xu Mengmeng Cao Hongtao Zhao Liu Liu Jiankang Zhu Xia Li | 2020 | Molecular Plant2020，13，9： | 10 |
| 2 | ESCRT-I Component VPS23A Is Targeted by E3 Ubiquitin Ligase XBAT35 for Proteasome-Mediated Degradation in Modulating ABA Signaling显示文摘A myriad of abiotic stress responses in plants are controlled by abscisic acid(ABA)signaling.ABA receptors can be degraded by both the 26S proteasome pathway and vacuolar degradation pathway after processing via the endosomal sorting complex required for transport(ESCRT)proteins.Despite being essential for ABA signaling,the upstream regulators of ESCRTs remain unknown.Here,we report that the ESCRT-I component VPS23A is an unstable protein that is degraded via the ubiquitin-proteasome system(UPS).The UEV domain of VPS23A physically interacts with the two PSAP motifs of XBAT35,an E3 ubiquitin ligase,and this interaction results in the deposition of K48 polyubiquitin chains on VPS23A,marking it for degradation by 26S proteasomes.We showed that XBAT35 in plants is a positive regulator of ABA responses that acts via the VPS23A/PYL4 complex,specifically by accelerating VPS23A turnover and thereby increasing accumulation of the ABA receptor PYL4.This work deciphers how an ESCRT component is regulated in plants and deepens our understanding of plant stress responses by illustrating a mechanism whereby crosstalk between the UPS and endosome-vacuole-mediated degradation pathways controls ABA signaling. | Feifei Yu Xiaoqiang Cao Guangchao Liu Qian Wang Ran Xia Xiangyun Zhang Qi Xie | 2020 | Molecular Plant2020，13，11： | 4 |
| 3 | 保卫细胞中ABA信号调控机制研究进展显示文摘脱落酸(ABA)具有调节植物快速响应逆境的重要功能。植物细胞中ABA核心信号通路由ABA受体PYR1/PYLs/RCARs、A类碱性蛋白磷酸酶PP2Cs和Snf1相关蛋白激酶SnRK2s组成。活性氧(ROS)和Ca^(2+)是保卫细胞中的重要第二信使,调控ABA诱导的气孔关闭。该文对保卫细胞中核心ABA信号蛋白的调控以及ROS和Ca^(2+)介导的ABA信号转导等最新研究成果进行综述,旨在阐明保卫细胞中ABA信号调控机制。 | 周玉萍 颜嘉豪 田长恩 | 2022 | 植物学报2022，57，5： | 2 |
| 4 | ABAting the Response:A Novel ABA Signal Terminator that Disrupts the Hormone Co-receptor Complex显示文摘The phytohormone abscisic acid(ABA)regulates multiple physiological processes such as embryo morphogenesis,seed maturation and germination,leaf senescence,fruit ripening,and stress adaptation(Gupta et al.,2020).ABA levels quickly rise in response to conditions leading to water deficit,including the developmental processes of seed drying and dormancy,as well as early post-germinative growth(Chen et al.,2020).Several proteins,commonly regarded as the ABA signaling core components,have been identified. | Akhtar Ali Jose M.Pardo Dae-Jin Yun | 2020 | Molecular Plant2020，13，9： | 0 |
| 5 | 泛素化与SUMO化修饰在脱落酸信号转导中的调控作用研究进展显示文摘重点阐述了泛素化和SUMO化2种相似的蛋白质翻译后修饰在脱落酸(abscisic acid,ABA)信号转导中的调控作用,系统总结了模式植物拟南芥中2种修饰对ABA信号转导通路中各元件的调控机制,讨论了2种翻译后修饰之间可能存在的相互联系,并对未来的研究方向进行了展望。 | 崔晓娜 陈美君 曹园园 周舒浩 李潇楠 张海荣 | 2023 | 河南农业大学学报2023，57，5： | 0 |
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