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Abscisic acid, xanthoxin and violaxanthin in the caps of gravistimulated maize rootsThe occurrence and distribution of abscisic acid (ABA), xanthoxin (Xa) and the carotenoid violaxanthin (Va) were investigated in root tips of maize (Zea mays L. cv. Merit). In roots grown in the dark, Va and ABA were present in relatively high amounts in the root cap and in low amounts in the adjacent terminal 1.5 mm of the root. Xanthoxin was present in equal concentrations in both regions. In roots exposed to light, the ABA distribution was reversed, with relatively low levels in the root cap and high levels in the adjacent 1.5-mm segment. Light also caused a decrease in Va in both regions of the root and an increase in Xa, especially in the cap. In the maize cultivar used for this work, light is necessary for gravitropic curving. This response occurs within the same time frame as the light-induced ABA redistribution as well as the changes in the levels of Va and Xa. These data are consistent with a role for ABA in root gravitropism and support the proposal that Xa may arise from the turnover of Va.
Document ID
20040089347
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Feldman, L. J.
(University of California Berkeley 94720, United States)
Arroyave, N. J.
Sun, P. S.
Date Acquired
August 21, 2013
Publication Date
January 1, 1985
Publication Information
Publication: Planta
Volume: 166
ISSN: 0032-0935
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: PCM 8101981
CONTRACT_GRANT: NAGW-234
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Plant Biology
Non-NASA Center
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