Abscisic Acid Regulates Auxin Homeostasis in Rice Root Tips to Promote Root Hair Elongation

Wang, Tao; Li, Chengxiang; Wu, Zhihua; Jia, Yancui; Wang, Hong; Sun, Shi-Yong; Mao, ChuanZao; Wang, Xuelu

doi:10.3389/fpls.2017.01121

Cited by 75 publications

(69 citation statements)

References 60 publications

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“…In ecotypes with high levels of IAA, we frequently observed lower levels of ABA (Figures 2 and 3) most likely as a result of the mutually negative interactions between metabolic pathways of the two hormones [20]; however, this trend was not significant. Therefore, we also examined the variation in the ratio of IAA and ABA among the ecotypes (Figure 4).…”

Section: Inherent Variation In Hormone Contentmentioning

confidence: 80%

Steady-State Levels of Cytokinins and Their Derivatives May Serve as a Unique Classifier of Arabidopsis Ecotypes

Samsonová

Kiran

Novák

et al. 2020

Plants

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We determined steady-state (basal) endogenous levels of three plant hormones (abscisic acid, cytokinins and indole-3-acetic acid) in a collection of thirty different ecotypes of Arabidopsis that represent a broad genetic variability within this species. Hormone contents were analysed separately in plant shoots and roots after 21 days of cultivation on agar plates in a climate-controlled chamber. Using advanced statistical and machine learning methods, we tested if basal hormonal levels can be considered a unique ecotype-specific classifier. We also explored possible relationships between hormone levels and the prevalent environmental conditions in the site of origin for each ecotype. We found significant variations in basal hormonal levels and their ratios in both root and shoot among the ecotypes. We showed the prominent position of cytokinins (CK) among the other hormones. We found the content of CK and CK metabolites to be a reliable ecotype-specific identifier. Correlation with the mean temperature at the site of origin and the large variation in basal hormonal levels suggest that the high variability may potentially be in response to environmental factors. This study provides a starting point for ecotype-specific genetic maps of the CK metabolic and signalling network to explore its contribution to the adaptation of plants to local environmental conditions.

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Section: Inherent Variation In Hormone Contentmentioning

confidence: 80%

Steady-State Levels of Cytokinins and Their Derivatives May Serve as a Unique Classifier of Arabidopsis Ecotypes

Samsonová

Kiran

Novák

et al. 2020

Plants

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“…The expression of auxin reporter ProDR5:GUS was greatly reduced in roots and leaves of Arabidopsis under ABA treatment, suggesting auxin concentration or response is regulated by ABA [ 41 ]. In rice, ABA promoted auxin biosynthesis and polar auxin transport, leading to auxin accumulation in the root tip, and then regulate root hair elongation [ 42 ]. The mutant of several auxin-related genes affects ABA sensitivity or ABA activity in the process of plant development.…”

Section: Discussionmentioning

confidence: 99%

Regulatory Mechanism of ABA and ABI3 on Vegetative Development in the Moss Physcomitrella patens

Zhao

Chen

et al. 2018

IJMS

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The moss Physcomitrella patens is a model system for studying plant developmental processes. ABSCISIC ACID INSENSITIVE3 (ABI3), a transcription factor of the ABA signaling pathway, plays an important role in plant growth and development in vascular plant. To understand the regulatory mechanism of ABA and PpABI3 on vegetative development in Physcomitrella patens, we applied physiological, cellular, and RNA-seq analyses in wild type (WT) plants and ∆abi3 mutants. During ABA treatment, the growth of gametophytes was inhibited to a lesser extent ∆abi3 plants compared with WT plants. Microscopic observation indicated that the differentiation of caulonemata from chloronemata was accelerated in ∆abi3 plants when compared with WT plants, with or without 10 μM of ABA treatment. Under normal conditions, auxin concentration in ∆abi3 plants was markedly higher than that in WT plants. The auxin induced later differentiation of caulonemata from chloronemata, and the phenotype of ∆abi3 plants was similar to that of WT plants treated with exogenous indole-3-acetic acid (IAA). RNA-seq analysis showed that the PpABI3-regulated genes overlapped with genes regulated by the ABA treatment, and about 78% of auxin-related genes regulated by the ABA treatment overlapped with those regulated by PpABI3. These results suggested that ABA affected vegetative development partly through PpABI3 regulation in P. patens; PpABI3 is a negative regulator of vegetative development in P. patens, and the vegetative development regulation by ABA and PpABI3 might occur by regulating the expression of auxin-related genes. PpABI3 might be associated with cross-talk between ABA and auxin in P. patens.

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“…Abiotic stresses, especially water deficit, induce ABA accumulation, which triggers rapid biochemical and physiological responses that enhance stress adaptation. Although ABA may promote root growth in response to drought stress, it generally has inhibitory roles in affecting overall plant growth (1)(2)(3)(4)(5)(6)(7)(8)(9). ABA is perceived by the soluble pyrabactin resistance 1 (PYR1)/PYR1-like (PYL)/regulatory components of the ABA receptor (RCAR) family of proteins (9)(10)(11)(12).…”

mentioning

confidence: 99%

Mutations in a subfamily of abscisic acid receptor genes promote rice growth and productivity

Miao

Xiao

Hua

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

290

171

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Abscisic acid (ABA) is a key phytohormone that controls plant growth and stress responses. It is sensed by the pyrabactin resistance 1 (PYR1)/PYR1-like (PYL)/regulatory components of the ABA receptor (RCAR) family of proteins. Here, we utilized CRISPR/Cas9 technology to edit group I (- and ) and group II (- and ) genes in rice. Characterization of the combinatorial mutants suggested that genes in group I have more important roles in stomatal movement, seed dormancy, and growth regulation than those in group II. Among all of the single mutants, only and exhibited significant defects in seed dormancy. Interestingly, high-order group I mutants, but not any group II mutants, displayed enhanced growth. Among group I mutants, exhibited the best growth and improved grain productivity in natural paddy field conditions, while maintaining nearly normal seed dormancy. Our results suggest that a subfamily of rice has evolved to have particularly important roles in regulating plant growth and reveal a genetic strategy to improve rice productivity.

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Abscisic Acid Regulates Auxin Homeostasis in Rice Root Tips to Promote Root Hair Elongation

Cited by 75 publications

References 60 publications

Steady-State Levels of Cytokinins and Their Derivatives May Serve as a Unique Classifier of Arabidopsis Ecotypes

Steady-State Levels of Cytokinins and Their Derivatives May Serve as a Unique Classifier of Arabidopsis Ecotypes

Regulatory Mechanism of ABA and ABI3 on Vegetative Development in the Moss Physcomitrella patens

Mutations in a subfamily of abscisic acid receptor genes promote rice growth and productivity

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