Diverse structural variations of the brassinosteroids in Phaseolus vulgaris seed.

Yokota, Takao; Koba, Shigeki; Kim, Seong Ki; Takatsuto, Suguru; Ikekawa, Nobuo; Sakakibara, Masayuki; Okada, Katsuhide; Mori, Kenji; Takahashi, Nobutaka

doi:10.1271/bbb1961.51.1625

Cited by 46 publications

(9 citation statements)

References 3 publications

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“…Although metabolic studies of both wild-type and mutant seedlings are required, the weak biological activity of 6-deoxocastasterone (Table IV) indicates that it is less likely to be converted to brassinolide by Ikb plants. Since 6-deoxocastasterone also shows a very low activity in the rice lamina inclination bioassay (Arima et al, 1984), a widely used BR assay system (Yokota and Mori, 1992), we have suggested that this compound is an inactivation product of BR metabolism rather than a precursor of brassinolide (Yokota et al, 1987). However, a recent study (Choi et al, 1996) showed that 6-deoxocastasterone was a precursor of castasterone and brassinolide in crown gall cells of C. roseus.…”

Section: Resultsmentioning

confidence: 89%

Blockage of Brassinosteroid Biosynthesis and Sensitivity Causes Dwarfism in Garden Pea

et al. 1997

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Endogenous brassinosteroids (BRs) in the dwarf mutants Ika and Ikb of garden pea (Pisum sativum 1.) and comparable wild-type plants were quantified by gas chromatography-selected ion monitoring using deuterated interna1 standards. In young shoots of the Ikb mutant, the levels of brassinolide, castasterone, and 6-deoxocastasterone were 23-, 22-, and 9-fold lower, respectively, than those of wild-type plants. Applications of brassinolide, castasterone, typhasterol, 3-dehydroteasterone, and teasterone nor-

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Section: Resultsmentioning

confidence: 89%

Blockage of Brassinosteroid Biosynthesis and Sensitivity Causes Dwarfism in Garden Pea

et al. 1997

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“…The molecular genetic analysis of cytochrome P450 (CYP) 85A1 and A2 in Arabidopsis has revealed that CS, as well as brassinolide, functions as an active BR to regulate growth and development in plants, particularly vegetative growing plants (Castle et al 2005;Kim et al 2005;Kwon et al 2005). It has been demonstrated previously that the immature seed of Phaseolus vulgaris contains CS and a number of uncharacterized stereoisomers of CS (Yokota et al 1987;Fujioka and Yokota 2003). Among the stereoisomers of CS, 2-epiCS has been recently characterized from Phaseolus seeds (Park et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Stereoisomers of Castasterone, 3-Epicastasterone and 2,3-Diepicastasterone, in Immature Seeds of Phaseolus vulgaris

2010

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A capillary GC-MS analysis revealed that two stereoisomers of castasterone are contained in immature seeds of Phaseolus vulgaris. 400 MHz proton NMR analysis of the stereoisomers determined they are A ring epimers of castasterone, 3-epicastasterone and 2,3-diepicastasterone. In rice lamina inclination assay, 3-epicastasterone and 2,3-diepicastasterone showed reduced biological activity than that of castasterone. Together with our previous finding that 2-epicastasterone exhibits a less biological activity than CS, this result indicates that epimerization of hydroxyl at C-2 or/and C-3 is/are inactive processes to reduce biological activity of CS after exerting as a bioactive brassinosteroid in P. vulgaris.

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“…P. vulgaris also contains 6-deoxocastasterone (6-deoxoCS), CS and brassinolide (BL) as 24S-methyl-BRs. 5,6 Together with the presence of 24-methylene-cholesterol and 24S-methyl-cholesterol as biosynthetic precursors for 24-methylene-BRs and 24S-methyl-BRs, respectively, it is implied that two biosynthetic pathways to produce 24-methylene-and 24S-methyl-BRs exist in plants ( Fig. 1).…”

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confidence: 99%

Biosynthetic Connection of 24-Methylene- and 24-Methyl-brassinosteroids in Phaseolus vulgaris

Joo¹,

Hwang²,

Park³

et al. 2009

Bulletin of the Korean Chemical Society

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Diverse structural variations of the brassinosteroids in Phaseolus vulgaris seed.

Cited by 46 publications

References 3 publications

Blockage of Brassinosteroid Biosynthesis and Sensitivity Causes Dwarfism in Garden Pea

Blockage of Brassinosteroid Biosynthesis and Sensitivity Causes Dwarfism in Garden Pea

Stereoisomers of Castasterone, 3-Epicastasterone and 2,3-Diepicastasterone, in Immature Seeds of Phaseolus vulgaris

Biosynthetic Connection of 24-Methylene- and 24-Methyl-brassinosteroids in Phaseolus vulgaris

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