8th International Conference Eco-Physiological Aspects of Plant Responses to Stress Factors September 16-19, 2009 Cracow, Poland

Abstract Plants have to cope with various environmental stress factors which significantly impact plant physiology and secondary metabolism. Individual stresses, such as low temperature, are known to activate plant volatile compounds as a defense. However, less is known about the effect of multiple stresses on plant volatile formation. Here, the effect of dual stresses (wounding and low temperature) on volatile compounds in tea (Camellia sinensis) plants and the underlying signalling mechanisms were investigated. Indole, an insect resistance volatile, was maintained at a higher content and for a longer time under dual stresses compared with wounding alone. CsMYC2a, a jasmonate (JA)-responsive transcription factor, was the major regulator of CsTSB2, a gene encoding a tryptophan synthase β-subunit essential for indole synthesis. During the recovery phase after tea wounding, low temperature helped to maintain a higher JA level. Further study showed that CsICE2 interacted directly with CsJAZ2 to relieve inhibition of CsMYC2a, thereby promoting JA biosynthesis and downstream expression of the responsive gene CsTSB2 ultimately enhancing indole biosynthesis. These findings shed light on the role of low temperature in promoting plant damage responses and advance knowledge of the molecular mechanisms by which multiple stresses coordinately regulate plant responses to the biotic and abiotic environment.

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Protein Phosphatase Type 2C Functions in Phytohormone-Dependent Pathways and in Plant Responses to Abiotic Stresses

Current Protein and Peptide Science ◽

10.2174/1389203722666210322144442 ◽

2021 ◽

Vol 22 ◽

Author(s):

Nguyen Nguyen Chuong ◽

Xuan Lan Thi Hoang ◽

Duong Hoang Trong Nghia ◽

Thai Ngoc Trang Dai ◽

Van-Anh Le Thi ◽

...

Keyword(s):

Signal Transduction ◽

Abiotic Stress ◽

Signaling Pathway ◽

Stress Responses ◽

Abiotic Stresses ◽

Protein Phosphatases ◽

Stress Factors ◽

Plant Responses ◽

Aba Signaling ◽

In Planta

: Plants, as sessile organisms, are susceptible to a myriad of stress factors, especially abiotic stresses. Over the course of evolution, they have developed multiple mechanisms to sense and transduce environmental stimuli for appropriate responses. Among those, phosphorylation and dephosphorylation, regulated by protein kinases and protein phosphatases, respectively, are considered as crucial signal transduction mechanisms. Regarding the latter group, protein phosphatases type 2C (PP2Cs) represent the largest division of PPs. In addition, discovery of regulatory functions of PP2Cs in abscisic acid (ABA)-signaling pathway, the major signal transduction pathway in abiotic stress responses, indicates significant importance of PP2C members in plant adaptation to adverse environmental factors. In this review, current understanding of the roles of PP2Cs in different phytohormone-dependent pathways related to abiotic stress is summarized, highlighting the crosstalk between the ABA-signaling pathway with other hormonal pathways via certain ABA-related PP2Cs. We also updated progress of in planta characterization studies of PP2Cs under abiotic stress conditions, providing knowledge of PP2C manipulation in developing abiotic stress-tolerant crops.

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