• 제목/요약/키워드: Brassinosteroids

검색결과 79건 처리시간 0.041초

통일계 벼의 Brassinosteroid활성물질 검색 (Investigation of Brassinosteroid substances in the shoots of hybrid type korean rices)

  • 현규환;박근형
    • KSBB Journal
    • /
    • 제6권2호
    • /
    • pp.123-128
    • /
    • 1991

  • The production of bassinosteroid-like substances of two hybrid types of Korean rice, Jangseongbyeo, Taebackbyeo were investigated. The shoots at the maximum tillering stage were extracted and purified by solvent fractionation, silica gel adsorption chromatography Sephadex LH-20 chromatography, charcoal adsorption chromatography, Bondesil chromatography and HPLC of reverse phase, successively. Biological activities of each purification step were monitored by the rice lamina inclination test. Higher activities against the rice lamina inclination test in the each purification step showed that the shoots of two cultivars biosynthesize brassinosteroids. Two cultivars also showed a similar distribution of biological activities of endogenous brassinosteroids detected by HPLC.

  • PDF

Brassinosteroids-mediated regulation of ABI3 is involved in high-temperature induced early flowering in plants

  • Hong, Jeongeui;Sung, Jwakyung;Ryu, Hojin
    • Journal of Plant Biotechnology
    • /
    • 제45권2호
    • /
    • pp.83-89
    • /
    • 2018

  • The interplay of plant hormones is one of the essential mechanisms for plant growth and development. A recent study reported that Brassinosteroids (BR) and ABSCISIC ACID (ABA) interact antagonistically in early seedling developments through the BR-mediated epigenetic repression of ABSCISIC ACID-INSENSITIVE 3 (ABI3). However, the other physiological roles of the BR-mediated regulation of ABI3 and ABA responses beyond early seedling developments remain largely unknown. Here, we showed that the activation of BR signaling by high temperatures promotes flowering time through the suppression of ABI3 expressions. Elevated ambient temperature induced early flowering in wild type Col-0 plants, but not in BR-defective bri1-116 mutant plants. Conversely, a hyper BR biosynthetic dwf4-D mutant displayed more sensitive thermomorphic long shoot elongation and early flowering. Both expression patterns and physiological responses supported the biological roles of ABI3 in the regulation of floral transition and reproduction under high temperature conditions. Finally, we confirmed that the lowered expressions of the transcript and protein levels of ABI3 brought on by elevated temperature were correlated with warmth-induced early flowering phenotypes. In conclusion, our data suggest that the BR- and warmth-mediated regulation of ABI3 are important in thermomorphic reproductive phase transitions in plants.

  • https://doi.org/10.5010/JPB.2018.45.2.083 인용 PDF KSCI

Plant growth and brassinosteroids

  • Lee, Kyu-Bae
    • 한국동물학회:학술대회논문집
    • /
    • 한국동물학회 2001년도 한국생물과학협회 학술발표대회
    • /
    • pp.88.2-90
    • /
    • 2001

  • No Abstract, See Full Text

  • PDF

Regulation of Plant Growth by Light-Growth Hormone Interactions

  • Park, Chung-Mo
    • Journal of Photoscience
    • /
    • 제9권2호
    • /
    • pp.94-97
    • /
    • 2002

  • Light is one of the most important environmental factors that influence plant growth and development. It does not function independently but exerts its role through coordinated interactions with intrinsic developmental programs, such as hormonal regulation. One typical example is hypocotyl growth in which light signals are modulated through growth hormones. However, the underlying molecular mechanisms are largely unknown. We demonstrated that brassinosteroids play an important role in the light signal transduction in etiolated hypocotyl growth. A light-responsive Ras-like G-protein, Pra2 from pea, physically and functionally interacts with a cytochrome P450 that specifically catalyzes C-2 hydroxylation in brassinosteroid biosynthesis. The cytochrome P450 expression, along with Pra2, is induced in the dark and predominantly localized in the rapidly elongating zone of etiolated pea epicotyls. Transgenic plants with a reduced level of Pra2 exhibit a dark-specific dwarfism, which is completely rescued by brassinosteroid application. On the contrary, overexpression of the cytochrome P450 results in enhanced hypocotyl growth even in the light, which phenocopies the etiolated hypocotyl growth. It is therefore envisioned that Pra2 is a molecular switch that mediates the crosstalk between light and brassinosteroids in the etiolation process.

  • PDF