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Record 6 of 73
Geoperception in primary and lateral roots of Phaseolus vulgaris (Fabaceae). III. A model to explain the differential georesponsiveness of primary and lateral roots
Author and Affiliation:
Ransom, J. S.(Baylor University, Department of Biology, Waco, TX 76798, United States)
Moore, R.
Abstract: Half-tipped primary and lateral roots of Phaseolus vulgaris bend toward the side of the root on which the intact half tip remains. Therefore, tips of lateral and primary roots produce growth effectors capable of inducing gravicurvature. The asymmetrical placement of a tip of a lateral root onto a detipped primary root results in the root bending toward the side of the root onto which the tip was placed. That is, the lesser graviresponsiveness of lateral roots as compared with primary roots is not due to the inability of their caps to produce growth inhibitors. The more pronounced graviresponsiveness of primary roots is positively correlated with the presence of columella tissues that are 3.8 times longer, 1.7 times wider, and 10.5 times more voluminous than the columellas of lateral roots. We propose that the lack of graviresponsiveness exhibited by lateral roots is due to the fact that they (i) produce smaller amounts of the inhibitor than primary (i.e., strongly graviresponsive) roots and (ii) are unable to redistribute the inhibitor so as to be able to create a concentration gradient sufficient to induce a pronounced gravitropic response.
Publication Date: Jan 01, 1985
Document ID:
20040089564
(Acquired Sep 07, 2004)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Canadian journal of botany (ISSN 0008-4026); Volume 63; 21-4
Publisher Information: Canada
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: GRAVITROPISM; LEGUMINOUS PLANTS; PLANT ROOTS; PLANTS (BOTANY); CYTOLOGY; EXOBIOLOGY
Other Descriptors: FABACEAE/CYTOLOGY/GROWTH & DEVELOPMENT/PHYSIOLOGY; GRAVITROPISM/PHYSIOLOGY; PLANT ROOT CAP/CYTOLOGY/GROWTH & DEVELOPMENT/PHYSIOLOGY; PLANT ROOTS/CYTOLOGY/GROWTH & DEVELOPMENT/PHYSIOLOGY; PLANTS, MEDICINAL; COMPARATIVE STUDY; NASA DISCIPLINE NUMBER 40-10; NASA DISCIPLINE PLANT BIOLOGY; NASA PROGRAM SPACE BIOLOGY; NON-NASA CENTER
Availability Source: Other Sources
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