ISSN:
1432-2048
Keywords:
Allium
;
Calcium and gravitropism
;
Morphactin
;
Naphthylphthalamic acid
;
Pisum (gravitropism)
;
2,3,5-Triiodobenzoic acid
;
Zea (gravitropism)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Primary roots of maize (Zea mays L.) and pea (Pisum sativum L.) exhibit strong positive gravitropism. In both species, gravistimulation induces polar movement of calcium across the root tip from the upper side to the lower side. Roots of onion (Allium cepa L.) are not responsive to gravity and gravistimulation induces little or no polar movement of calcium across the root tip. Treatment of maize or pea roots with inhibitors of auxin transport (morphactin, naphthylphthalamic acid, 2,3,5-triiodobenzoic acid) prevents both gravitropism and gravity-induced polar movement of calcium across the root tip. The results indicate that calcium movement and auxin movement are closely linked in roots and that gravity-induced redistribution of calcium across the root cap may play an important role in the development of gravitropic curvature.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00411142
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