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Reduced de-etiolation of hypocotyl growth in a tomato mutant is associated with hypersensitivity to, and high endogenous levels of, abscisic acid
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SYSNO ASEP 0172199 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Reduced de-etiolation of hypocotyl growth in a tomato mutant is associated with hypersensitivity to, and high endogenous levels of, abscisic acid Author(s) Fellner, Martin (UEB-Q) RID, ORCID
Zhang, R. (CA)
Pharis, R. (CA)
Sawhney, V. (CA)Source Title Journal of Experimental Botany. - : Oxford University Press - ISSN 0022-0957
Roč. 52, č. 357 (2001), s. 725-738Number of pages 14 s. Language eng - English Country US - United States Keywords Abscisic acid ; elongated mutant ; fluridone Subject RIV EF - Botanics R&D Projects GV521/96/K117 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z5038910 - UEB-Q Annotation A recessive single gene mutant, 7B-1, in tomato was originally selected for its photoperiod-dependent male sterility. The 7B-1 mutant also has some pleiotropic effects including reduced light-induced inhibition, i.e. de-etiolation, of the hypocotyl in long days (LD), increased seed size and weight, and reduced transpiration rate. These traits led us to investigate the sensitivity of 7B-1 to exogenous hormones and the interaction of these responses with daylength. In LD, but not in short days (SD), 7B-1 was more sensitive than wild-type (WT) to exogenous abscisic acid (ABA) for inhibition of seed germination, root elongation and transpiration rate. 7B-1 mutant also exhibited reduced responses to exogenous gibberellin (GA3) for hypocotyl elongation, and to inhibitors of GA biosynthesis for seed germination and root and hypocotyl elongation. 7B-1 hypocotyls contained a higher level of endogenous ABA than WT in both photoperiods, although ABA levels were higher in LD than in SD. In contrast, growth-active GAs, i.e. GA1, GA3 and GA4, and IAA were low in the mutant hypocotyls. The 7B-1 mutant appears to be an ABA-overproducer, and the photoperiod-regulated ABA levels may be responsible for the hypersensitivity of the mutant to exogenous ABA. Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2002
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