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An endogenous growth inhibitor, 3‐hydroxy‐β‐ionone. III. Its longitudinal gradients in the first internode of Phaseolus vulgaris
Author(s) -
KatoNoguchi Hisashi
Publication year - 1996
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 - 10.1034/j.1399-3054.1996.980204.x
Subject(s) - phaseolus , plant stem , growth rate , biology , growth inhibition , botany , endogeny , plateau (mathematics) , horticulture , biochemistry , cell growth , mathematical analysis , geometry , mathematics
Dark‐grown, 10‐day‐old bean seedlings ( Phaseolus vulgaris L. cv. Morocco) were transferred to continuous light, and the resulting changes in growth rate and concentration of 3‐hydroxy‐β‐ionone, an endogenous growth inhibitor, were monitored. The growth rate of the first internodes of the seedlings decreased rapidly and leveled off 20 h after onset of light. This plateau value was about 25% of the growth rate of the non‐irradiated control. The concentration of 3‐hydroxy‐β‐ionone in the internodes of the irradiated seedlings increased rapidly and reached a plateau value after 16 h. This increased level of the inhibitor was about 5 times the level in the non‐irradiated control. The changes in the levels of the inhibitor in the internodes reflected the light‐induced growth inhibition of the internodes. The longitudinal distribution of the growth inhibitor along the first internodes of the seedlings was closely correlated with the light‐induced growth inhibition of the corresponding region of the internodes. The present results suggest that the endogenous growth inhibitor 3‐hydroxy‐β‐ionone may play an important role in the inhibition by light of internode growth of bean seedlings.