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Light regulation of the growth response in corn root gravitropismRoots of Merit variety corn (Zea mays L.) require red light for orthogravitropic curvature. Experiments were undertaken to identify the step in the pathway from gravity perception to asymmetric growth on which light may act. Red light was effective in inducing gravitropism whether it was supplied concomitant with or as long as 30 minutes after the gravity stimulus (GS). The presentation time was the same whether the GS was supplied in red light or in darkness. Red light given before the GS slightly enhanced the rate of curvature but had little effect on the lag time or on the final curvature. This enhancement was expanded by a delay between the red light pulse and the GS. These results indicate that gravity perception and at least the initial transduction steps proceed in the dark. Light may regulate the final growth (motor) phase of gravitropism. The time required for full expression of the light enhancement of curvature is consistent with its involvement in some light-stimulated biosynthetic event.
Document ID
20040090273
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Kelly, M. O.
(Boyce Thompson Institute for Plant Research, Cornell University Ithaca, New York 14853)
Leopold, A. C.
Date Acquired
August 21, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Plant physiology
Volume: 98
ISSN: 0032-0889
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAGW-3
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Number 40-50
Non-NASA Center
NASA Discipline Plant Biology
NASA Program Space Biology

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