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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2022.2
- 수록면
- 71 - 78 (8page)
- DOI
- 10.1007/s11816-021-00729-7
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초록· 키워드
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Jasmonic acid (JA) is a phytohormone that plays a central role in plant defense against necrotrophic pathogens. JA signal- ing stimulates the increase of cytosolic calcium ion (Ca2+) and implicates the activity of mitogen-activated protein kinases (MPKs). We previously characterized that Ca2+/calmodulin (CaM) activates MPKs by inhibiting a CaM-regulated dual- specificity protein phosphatase1 (DsPTP1) at the biochemical level. In this study, we reported that Ca2+/CaM-mediated DsPTP1 negatively regulates the resistance to necrotrophic pathogens through the inhibition of JA-responsive MPK6. To elucidate the physiological function of inhibiting DsPTP1 activity by Ca2+/CaM, we constructed transgenic plants over- expressing DsPTP1 wild type (DsPTP1WT OX) and CaM deregulated mutant (DsPTP1K166E OX). Interestingly, the MPK6 activity was significantly reduced in DsPTP1K166E OX plants in response to JA compared to DsPTP1WT OX plants. Moreover, transcript levels of JA-responsive gene PDF1.2 and VSP1 were also highly decreased in DsPTP1K166E OX plants compared to DsPTP1WT OX plants. Furthermore, DsPTP1K166E OX plants showed more susceptibility to necrotrophic pathogens than DsPTP1WT OX plants. Conclusively, these results suggest that Ca2+/CaM activates the JA-responsive MPKs by inhibiting DsPTP1 for the resistance to the necrotrophic pathogen
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