Premium
Effect of abscisic acid on exudation from deficient and aged sunflower roots
Author(s) -
Glinka Zvi,
Abir Noemi
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.tb00759.x
Subject(s) - abscisic acid , xylem , helianthus annuus , sunflower , horticulture , chemistry , endogeny , botany , biology , biochemistry , gene
The effect of abscisic acid (ABA) was observed on exudation from roots of sunflower ( Helianthus annuus L. cv. Habad) plants whose mineral nutrition was cut off or which were deprived of K + or NO − 3 for 90 h prior to excision. In spite of a marked decrease in exudation rate, the magnitude of the promotive effect of ABA on both volume flow and release of ions to the xylem was similar to that obtained in roots of plants grown in full nutrient solution. Application of ABA to the medium at different times after excision increased the promotive effect of ABA as the time from excision increased. The magnitude of the ratio ABA‐treated/control in roots which were treated 74 h after excision was twice that in freshly‐excised roots. The effect of ABA lasted up to 50 h and during that period it followed the endogenous rhythm in exudation from the control roots. It is concluded that since a steady promotive effect of ABA persists under a variety of experimental conditions, this may be considered a genera! phenomenon in sunflower roots.