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Graviresponsiveness and abscisic-acid content of roots of carotenoid-deficient mutants of Zea mays LThe abscisic-acid (ABA) content of roots of the carotenoid-deficient w-3, vp-5, and vp-7 mutants of Z. mays was analyzed using gas chromatography-mass spectrometry with an analysis sensitivity of 6 ng ABA g-1 fresh weight (FW). Roots of normal seedlings of the same lines were characterized by the following amounts of ABA (as ng ABA g-1 FW, +/- standard deviation): w-3, 279 +/- 43; vp-5, 237 +/- 26; vp-7, 338 +/- 61. We did not detect any ABA in roots of any of the mutants. Thus, the lack of carotenoids in these mutants correlated positively with the apparent absence of ABA. Primary roots of normal and mutant seedlings were positively gravitropic, with no significant differences in the curvatures of roots of normal as compared with mutant seedlings. These results indicate that ABA 1) is synthesized in maize roots via the carotenoid pathway, and 2) is not necessary for positive gravitropism by primary roots of Z. mays.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Moore, R.
(Baylor University Waco, TX 76798, United States)
Smith, J. D.
Date Acquired
August 21, 2013
Publication Date
January 1, 1985
Publication Information
Publication: Planta
Volume: 164
ISSN: 0032-0935
Subject Category
Life Sciences (General)
Distribution Limits
NASA Discipline Plant Biology
Non-NASA Center

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