Journal Article

Biological Activities of an Abscisic Acid Analog in Barley, Cress, and Rice

Tadao Asami, Masumi Robertson, Shin Yamamoto, Koichi Yoneyama, Yasutomo Takeuchi and Shigeo Yoshida

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 3, pages 342-348
Published in print March 1998 | ISSN: 0032-0781
Published online March 1998 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029375
Biological Activities of an Abscisic Acid Analog in Barley, Cress, and Rice

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Biological activities of an abscisic acid (ABA) analog, RCA-7a [l-(3-carboxyl-5-methylphenyl)-l-hydroxy-2,6,6-trimethyl-4-oxo-2-cyclohexene], carrying a phenyl group in the side chain are reported. ( + )-RCA-7a was approximately 3-fold less active than ( + )-ABA in the inhibition of α-amylase induction by gibberellic acid (GA3) in embryo-less barley grains. In aleurone layers, RCA-7a inhibited GA3-in-duced a-amylase mRNA accumulation and induced the accumulation of dehydrin mRNA, but less effectively than ABA. It also activated a dehydrin gene promoter in barley aleurone protoplast transient assays. A higher concentration of RCA-7a than ABA was required for similar levels of inhibition of the growth of cress plants at 1 week after sowing; however, RCA-7a remained effective for at least 3 weeks. In contrast, ABA rapidly lost its effectiveness and became less effective than RCA-7a by 3 weeks. RCA-7a also significantly retarded the growth of rice plants. These greenhouse pot experiments showed that RCA-7a had more useful characteristics than ABA for practical applications. These and our previous results indicate that RCA-7a has an ABA-like activity in various biological processes in plants and has potential as a novel plant growth regulator.

Keywords: Abscisic acid; Aleurone cells; α-Amylase; Dehydrin; Gibberellin; Plant growth regulator

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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