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Cytokinin oxidase PpCKX1 plays regulatory roles in development and enhances dehydration and salt tolerance in Physcomitrella patens

Plant cell reports, 2020-03, Vol.39 (3), p.419-430 [Peer Reviewed Journal]

Springer-Verlag GmbH Germany, part of Springer Nature 2019 ;Plant Cell Reports is a copyright of Springer, (2019). All Rights Reserved. ;ISSN: 0721-7714 ;EISSN: 1432-203X ;DOI: 10.1007/s00299-019-02500-3 ;PMID: 31863135

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Title:
Cytokinin oxidase PpCKX1 plays regulatory roles in development and enhances dehydration and salt tolerance in Physcomitrella patens
Author: Hyoung, Sujin ; Cho, Sung Hyun ; Chung, Joo Hee ; So, Won Mi ; Cui, Mei Hua ; Shin, Jeong Sheop
Subjects: Biomedical and Life Sciences ; Biotechnology ; Bryopsida - enzymology ; Bryopsida - genetics ; Bryopsida - growth & development ; Cell Biology ; Cell division ; Cytokinins ; Cytokinins - metabolism ; Dehydration ; Developmental stages ; Divergence ; Gene Expression Regulation, Plant ; Growth conditions ; Hormones ; Life Sciences ; Original Article ; Oxidoreductases - metabolism ; Phenotype ; Phylogeny ; Physcomitrella patens ; Plant Biochemistry ; Plant growth ; Plant Sciences ; Plants, Genetically Modified ; Salinity tolerance ; Salt Stress - genetics ; Salt tolerance ; Salt Tolerance - genetics ; Senescence ; Stem cells ; Stem Cells - metabolism ; Vacuoles ; Vacuoles - metabolism
Is Part Of: Plant cell reports, 2020-03, Vol.39 (3), p.419-430
Description: Key message PpCKX1 localizes to vacuoles and is dominantly expressed in the stem cells. PpCKX1 regulates developmental changes with increased growth of the rhizoid and enhances dehydration and salt tolerance. Cytokinins (CKs) are plant hormones that regulate plant development as well as many physiological processes, such as cell division, leaf senescence, control of shoot/root ratio, and reproductive competence. Cytokinin oxidases/dehydrogenases (CKXs) control CK concentrations by degradation, and thereby influence plant growth and development. In the moss Physcomitrella patens , an evolutionarily early divergent plant, we identified six putative CKX s that, by phylogenetic analysis, form a monophyletic clade. We also observed that ProPpCKX1:GUS is expressed specifically in the stem cells and surrounding cells and that CKX1 localizes to vacuoles, as indicated by Pro35S:PpCKX1-smGFP. Under normal growth conditions, overexpression of PpCKX1 caused many phenotypic changes at different developmental stages, and we suspected that increased growth of the rhizoid could affect those changes. In addition, we present evidence that the PpCKX1 -overexpressor plants show enhanced dehydration and salt stress tolerance. Taken together, we suggest that PpCKX1 plays regulatory roles in development and adaptation to abiotic stresses in this evolutionarily early land plant species.
Publisher: Berlin/Heidelberg: Springer Berlin Heidelberg
Language: English
Identifier: ISSN: 0721-7714
EISSN: 1432-203X
DOI: 10.1007/s00299-019-02500-3
PMID: 31863135
Source: MEDLINE
ProQuest Central

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Cytokinin oxidase PpCKX1 plays regulatory roles in development and enhances dehydration and salt tolerance in Physcomitrella patens

Springer-Verlag GmbH Germany, part of Springer Nature 2019 ;Plant Cell Reports is a copyright of Springer, (2019). All Rights Reserved. ;ISSN: 0721-7714 ;EISSN: 1432-203X ;DOI: 10.1007/s00299-019-02500-3 ;PMID: 31863135

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