Turning on gibberellin and abscisic acid signaling

Razem, Fawzi A.; Baron, Kevin; Hill, Robert D.

doi:10.1016/j.pbi.2006.07.007

Cited by 129 publications

(73 citation statements)

References 30 publications

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“…A similar phenotype has been reported for mutants defective for GA biosynthesis (Koornneef et al, 1990). As ABA signaling is typically antagonistic to GA signaling (Razem et al, 2006), a possible explanation for this similarity is that the likely ABA-mediated stress response in the axy9.2 mutant suppresses either the production or perception of GA, leading to the axy9.2 mutants having a similar phenotype to that of mutants defective for GA biosynthesis.…”

Section: Growth Phenotype Of the Axy92 Mutantsupporting

confidence: 66%

The Role of the Plant-Specific ALTERED XYLOGLUCAN9 Protein in Arabidopsis Cell Wall PolysaccharideO-Acetylation

et al. 2015

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A mutation in the ALTERED XYLOGLUCAN9 (AXY9) gene was found to be causative for the decreased xyloglucan acetylation phenotype of the axy9.1 mutant, which was identified in a forward genetic screen for Arabidopsis (Arabidopsis thaliana) mutants. The axy9.1 mutant also exhibits decreased O-acetylation of xylan, implying that the AXY9 protein has a broad role in polysaccharide acetylation. An axy9 insertional mutant exhibits severe growth defects and collapsed xylem, demonstrating the importance of wall polysaccharide O-acetylation for normal plant growth and development. Localization and topological experiments indicate that the active site of the AXY9 protein resides within the Golgi lumen. The AXY9 protein appears to be a component of the plant cell wall polysaccharide acetylation pathway, which also includes the REDUCED WALL ACETYLATION and TRICHOME BIREFRINGENCE-LIKE proteins. The AXY9 protein is distinct from the TRICHOME BIREFRINGENCE-LIKE proteins, reported to be polysaccharide acetyltransferases, but does share homology with them and other acetyltransferases, suggesting that the AXY9 protein may act to produce an acetylated intermediate that is part of the O-acetylation pathway.

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Section: Growth Phenotype Of the Axy92 Mutantsupporting

confidence: 66%

The Role of the Plant-Specific ALTERED XYLOGLUCAN9 Protein in Arabidopsis Cell Wall PolysaccharideO-Acetylation

et al. 2015

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“…GA acts as a major hormone in plants and regulates many processes of growth and productivity. It has been reported that GA controls plant height (Richards et al, 2001;Jiang and Fu, 2007;Davière et al, 2008;Gao et al, 2008;Shimada et al, 2008), seed germination and dormancy Finch-Savage and Leubner-Metzger, 2006;Razem et al, 2006;Seo et al, 2006), fertility and flowering (Achard et al, 2004(Achard et al, , 2007Cheng et al, 2004;Kaneko et al, 2004;Chhun et al, 2007;Lin et al, 2011), and prostrate habit (Cui et al, 2005;Appleford et al, 2007;Wolbang et al, 2007). Our results showed that plants with Rht-B1c are completely insensitive to GA, whereas those with Rht-B1b and Rht-B1a are weakly insensitive and sensitive, respectively.…”

Section: Pleiotropism Of Gai Is Associated With Its Dominancesupporting

confidence: 56%

Dominant and Pleiotropic Effects of aGAIGene in Wheat Results from a Lack of Interaction between DELLA and GID1

Kong

Wan

et al. 2011

Plant Physiology

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Dominance, semidominance, and recessiveness are important modes of Mendelian inheritance. The phytohormone gibberellin (GA) regulates many plant growth and developmental processes. The previously cloned semidominant GA-insensitive (GAI) genes Reduced height1 (Rht1) and Rht2 in wheat (Triticum aestivum) were the basis of the Green Revolution. However, no completely dominant GAI gene has been cloned. Here, we report the molecular characterization of Rht-B1c, a dominant GAI allele in wheat that confers more extreme characteristics than its incompletely dominant alleles. Rht-B1c is caused by a terminal repeat retrotransposons in miniature insertion in the DELLA domain. Yeast two-hybrid assays showed that Rht-B1c protein fails to interact with GA-INSENSITIVE DWARF1 (GID1), thereby blocking GA responses and resulting in extreme dwarfism and pleiotropic effects. By contrast, Rht-B1b protein only reduces interaction with GID1. Furthermore, we analyzed its functions using near-isogenic lines and examined its molecular mechanisms in transgenic rice. These results indicated that the affinity between GID1 and DELLA proteins is key to regulation of the stability of DELLA proteins, and differential interactions determine dominant and semidominant gene responses to GA.

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“…As the interactions between GA and other hormones involve components from the GA biosynthetic and response pathways, we first briefly introduce a few relevant players in these pathways. For a more comprehensive description of these pathways, see recent reviews (Hedden and Phillips, 2000;Sun and Gubler, 2004;Hartweck and Olszewski, 2006;Lange and Lange, 2006;Razem et al, 2006). The GA biosynthetic pathway has been elucidated by a combination of biochemical and genetic approaches.…”

Section: Ga Biosynthetic and Response Pathwaysmentioning

confidence: 99%

“…Whereas GA is associated with the promotion of germination, growth, and flowering, ABA inhibits these processes. Moreover, the antagonistic relationship and the ratio between these two hormones regulate the transition from embryogenesis to seed germination (Razem et al, 2006). Several different mechanisms have been shown to underlie this antagonistic interaction in different developmental processes (Fig.…”

Section: Mechanism Of the Antagonistic Interaction Between Ga And Abamentioning

confidence: 99%

Mechanisms of Cross Talk between Gibberellin and Other Hormones

2007

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Turning on gibberellin and abscisic acid signaling

Cited by 129 publications

References 30 publications

The Role of the Plant-Specific ALTERED XYLOGLUCAN9 Protein in Arabidopsis Cell Wall PolysaccharideO-Acetylation

The Role of the Plant-Specific ALTERED XYLOGLUCAN9 Protein in Arabidopsis Cell Wall PolysaccharideO-Acetylation

Dominant and Pleiotropic Effects of aGAIGene in Wheat Results from a Lack of Interaction between DELLA and GID1

Mechanisms of Cross Talk between Gibberellin and Other Hormones

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