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An endogenous growth inhibitor, 3‐hydroxy‐β‐ionone. II. Changes in its levels associated with the light‐induced growth inhibition of hypocotyls of Phaseolus vulgaris
Author(s) -
KatoNoguchi Hisashi
Publication year - 1993
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.1399-3054.1993.tb05193.x
Subject(s) - hypocotyl , cultivar , phaseolus , biology , growth inhibition , botany , horticulture , biochemistry , cell growth
Dark‐grown, 4‐day‐old seedlings of dwarf bean ( Phuseolus vulgaris L. cv. Morocco) and tall bean (cv. Kentucky Wonder) were transferred to conditions of continuous light at various fluence rates, and the resulting changes in growth rates and concentration of 3‐hydroxy‐β‐ionone, a novel endogenous growth inhibitor, were monitored. The light‐induced inhibition of growth and the levels of the inhibitor concentration were dependent on the fluence rate of light applied. The growth rate of hypocotyls of both cultivars decreased rapidly and reached a plateau 18 h after the onset of light. However, the more noticeable changes were the marked inhibition of growth of the hypocotyls of the dwarf cultivar. The concentration of 3‐hydroxy‐β‐ionone in the hypocotyls of both cultivars increased after a 20‐min lag and reached plateau values after 12 h. The concentration of the inhibitor in the hypocotyls of the dwarf cultivar increased to about 4 to 8 times the level in the nonirradiated controls, while that in the hypocotyls of the tall cultivar increased only about 2‐ to 3‐fold under the same conditions. The high concentration of 3‐hydroxy‐β‐ionone in the dwarf cultivar under steady‐state conditions in continuous light, as compared with that in the tall cultivar, may determine the growth habit of these cultivars.