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Int. J. Mol. Sci. 2018, 19(9), 2609; https://doi.org/10.3390/ijms19092609

PpSARK Regulates Moss Senescence and Salt Tolerance through ABA Related Pathway

1
Key Laboratory of Economic Plants and Biotechnology, Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan Key Laboratory for Wild Plant Resources, Kunming 650201, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan 430070, China
4
Mid-Florida Research and Education Center, Department of Environmental Horticulture, University of Florida, Apopka, FL 32703, USA
*
Author to whom correspondence should be addressed.
Received: 20 July 2018 / Revised: 30 August 2018 / Accepted: 30 August 2018 / Published: 3 September 2018
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Abstract

Senescence-associated receptor-like kinase (SARK) family members in Arabidopsis, soybean, and rice are known to be positive regulators of leaf senescence. In the meantime, SARKs are extensively involved in stress response. However, their function and underlying molecular mechanism in stress responses in moss are not well known. Here, we investigated functional roles of SARK isolated from Physcomitrella patens (PpSARK) in salt stress response and senescence. PpSARK transcripts significantly accumulated under NaCl and abscisic acid (ABA) treatments, with higher expression in the moss gametophyte stage. Insertional gain-of-function mutants of PpSARK (PpSARKg) were more tolerant to salt stress and ABA than wild type (WT), whereas senescence of mutants was delayed during the protonema stage. Expression of stress-responsive genes in the ABA related pathway, such as PpABI3, PpABI5, PpPP2C, and PpLEA were significantly higher in PpSARKg and WT under salt stress conditions, suggesting that PpSARK might positively regulate salt tolerance via an ABA-related pathway. Endogenous ABA contents also increased 3-fold under salt stress conditions. These results indicate that PpSARK functions as a positive regulator in salt stress responses, while possibly functioning as a negative regulator in senescence in moss. View Full-Text
Keywords: senescence; salt stress response; ABA; SARK; moss (Physcomitrella patens) senescence; salt stress response; ABA; SARK; moss (Physcomitrella patens)
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Li, P.; Yang, H.; Liu, G.; Ma, W.; Li, C.; Huo, H.; He, J.; Liu, L. PpSARK Regulates Moss Senescence and Salt Tolerance through ABA Related Pathway. Int. J. Mol. Sci. 2018, 19, 2609.

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