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

Hyoung, Sujin; Cho, Sung Hyun; Chung, Joo Hee; So, Won Mi; Cui, Mei Hua; Shin, Jeong Sheop

doi:10.1007/s00299-019-02500-3

Cited by 44 publications

(27 citation statements)

References 40 publications

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“…Mutants with a loss-of-function mutation in genes involved in the cytokinin synthesis pathway-such as Atipt1, Atipt3, Atipt5, and Atipt7-exhibit a stronger salt-tolerant phenotype than the wild-type [104,106]. Overexpression of PpCKX1 in the moss Physcomitrella patens causes cytokinin levels to decrease and exhibit higher salt tolerance [107]. MsCKX overexpression enhances the salt tolerance of transgenic alfalfa plants by maintaining a high K + /Na + ratio and enhancing the activity of antioxidant enzymes to scavenge ROS [108].…”

Section: Salt Stress Responsementioning

confidence: 99%

Research Progress on the Roles of Cytokinin in Plant Response to Stress

Liu

Zhang

Meng

et al. 2020

IJMS

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Cytokinins promote plant growth and development under normal plant growth conditions and also play an important role in plant resistance to stress. Understanding the working mechanisms of cytokinins under adverse conditions will help to make full use of cytokinins in agriculture to increase production and efficiency of land use. In this article, we review the progress that has been made in cytokinin research in plant response to stress and propose its future application prospects.

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Section: Salt Stress Responsementioning

confidence: 99%

Research Progress on the Roles of Cytokinin in Plant Response to Stress

Liu

Zhang

Meng

et al. 2020

IJMS

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“…Arabidopsis AUX receptor mutants are more sensitive to salt stress and the AUX receptor genes TIR1 and AFB2 are downregulated under salt stress, which indicates that Arabidopsis slows plant growth to improve salt tolerance by maintaining a low AUX signal response [ 14 , 15 ]. Meanwhile, CKs are involved in cell division, reproductive development, leaf senescence, regulation of root-shoot ratios, and adaptation to abiotic stress during plant growth and development [ 16 , 17 ]. CKs are sensed by receptors AHK2/3/4 located on the cell membrane and activate B-type transcription factor ARRs through phosphorylation [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Phytohormone Signal Transduction in Sophora alopecuroides under Salt Stress

Zhu

Wang

Gao

et al. 2021

IJMS

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Salt stress seriously restricts crop yield and quality, leading to an urgent need to understand its effects on plants and the mechanism of plant responses. Although phytohormones are crucial for plant responses to salt stress, the role of phytohormone signal transduction in the salt stress responses of stress-resistant species such as Sophora alopecuroides has not been reported. Herein, we combined transcriptome and metabolome analyses to evaluate expression changes of key genes and metabolites associated with plant hormone signal transduction in S. alopecuroides roots under salt stress for 0 h to 72 h. Auxin, cytokinin, brassinosteroid, and gibberellin signals were predominantly involved in regulating S. alopecuroides growth and recovery under salt stress. Ethylene and jasmonic acid signals may negatively regulate the response of S. alopecuroides to salt stress. Abscisic acid and salicylic acid are significantly upregulated under salt stress, and their signals may positively regulate the plant response to salt stress. Additionally, salicylic acid (SA) might regulate the balance between plant growth and resistance by preventing reduction in growth-promoting hormones and maintaining high levels of abscisic acid (ABA). This study provides insight into the mechanism of salt stress response in S. alopecuroides and the corresponding role of plant hormones, which is beneficial for crop resistance breeding.

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“…As a result of these redistributions, CKs participate in various biochemical and physiological processes, such as cell division and leaf senescence, thus controlling the root/shoot ratio. The long-distant CK transport is also essential for plant responses to abiotic stresses, including salt [ 110 , 111 ] ( Figure 1 ).…”

Section: Effects Of Plant Growth Regulators On Plant Performance Under Saline Conditionsmentioning

confidence: 99%

“…CK has both a positive and negative regulatory role in alleviating the detrimental effects of salinity stress. For example, cytokinin deficiency leads to enhanced salinity tolerance in Physcomitrella patens and Arabidopsis [ 111 , 112 , 113 ], and contributed to yield improvement in many crops [ 114 ]. Cytokinin oxidase (CKX) is the prime enzyme involved in CK metabolism, which can effectively reduce the concentration of CK in plants.…”

Section: Effects Of Plant Growth Regulators On Plant Performance Under Saline Conditionsmentioning

confidence: 99%

“…Cytokinin oxidase (CKX) is the prime enzyme involved in CK metabolism, which can effectively reduce the concentration of CK in plants. The overexpression of CKX significantly influences hyposensitivity to salt stress in Physcomitrella patens [ 111 , 112 ]. Regulation of isopentenyltransferase (IPT) genes under conditions of salinity stress also reduces CK content in Arabidopsis and enhances its tolerance to salinity [ 112 , 115 , 116 ].…”

Section: Effects Of Plant Growth Regulators On Plant Performance Under Saline Conditionsmentioning

confidence: 99%

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Improving Performance of Salt-Grown Crops by Exogenous Application of Plant Growth Regulators

et al. 2021

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Soil salinity is one of the major abiotic stresses restricting plant growth and development. Application of plant growth regulators (PGRs) is a possible practical means for minimizing salinity-induced yield losses, and can be used in addition to or as an alternative to crop breeding for enhancing salinity tolerance. The PGRs auxin, cytokinin, nitric oxide, brassinosteroid, gibberellin, salicylic acid, abscisic acid, jasmonate, and ethylene have been advocated for practical use to improve crop performance and yield under saline conditions. This review summarizes the current knowledge of the effectiveness of various PGRs in ameliorating the detrimental effects of salinity on plant growth and development, and elucidates the physiological and genetic mechanisms underlying this process by linking PGRs with their downstream targets and signal transduction pathways. It is shown that, while each of these PGRs possesses an ability to alter plant ionic and redox homeostasis, the complexity of interactions between various PGRs and their involvement in numerous signaling pathways makes it difficult to establish an unequivocal causal link between PGRs and their downstream effectors mediating plants’ adaptation to salinity. The beneficial effects of PGRs are also strongly dependent on genotype, the timing of application, and the concentration used. The action spectrum of PGRs is also strongly dependent on salinity levels. Taken together, this results in a rather narrow “window” in which the beneficial effects of PGR are observed, hence limiting their practical application (especially under field conditions). It is concluded that, in the light of the above complexity, and also in the context of the cost–benefit analysis, crop breeding for salinity tolerance remains a more reliable avenue for minimizing the impact of salinity on plant growth and yield. Further progress in the field requires more studies on the underlying cell-based mechanisms of interaction between PGRs and membrane transporters mediating plant ion homeostasis.

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

Cited by 44 publications

References 40 publications

Research Progress on the Roles of Cytokinin in Plant Response to Stress

Research Progress on the Roles of Cytokinin in Plant Response to Stress

Analysis of Phytohormone Signal Transduction in Sophora alopecuroides under Salt Stress

Improving Performance of Salt-Grown Crops by Exogenous Application of Plant Growth Regulators

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