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Effect of gibberellic acid on K + (Rb + ) uptake and transport in sunflower roots
Author(s) -
Benlloch Manuel,
Fournier José M.,
Guardia Manuel Díaz
Publication year - 1983
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1983.tb00733.x
Subject(s) - gibberellic acid , helianthus annuus , sunflower , shoot , xylem , helianthus , nutrient , chemistry , botany , gibberellin , horticulture , biology , germination , organic chemistry
Four‐week‐old sunflower plants ( Helianthus annuus L. cv. Halcón), grown in different nutrient solutions, were used to study the effects of gibberellic acid (GA 3 ) on K + (Rb + ) uptake by roots or transport to the shoot. Gibberellic acid application to the nutrient solution did not affect the exudation process of excised roots. When GA 3 was sprayed on leaves 2 to 6 days before excising the roots, the rate of exudation and the K + flux increased. When the exudation study was done keeping the roots in a nutrient solution in which Rb + replaced K + , the GA 3 effects were evident also on Rb + uptake and transport. In intact plants, GA 3 increased the Rb + transported to the shoot but did not affect Rb + accumulation in the root. It is suggested that these GA 3 effects can be explained if it is assumed that GA 3 acts on the transport of ions to the xylem vessels.