Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 64, Issue 4, Pages 808-815Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.64.808
Keywords
4-chloroindole-3-acetic acid eaters; chlorinated auxins; Avena coleoptile elongation; hypocotyl growth inhibition; adventitious root formation
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4-Chloroindole-3-acetic acid (4-CI-IAA) and its esters were synthesized from 2-chloro-6-nitrotoluene as the starting material. The biological activities of 4-CI-IAA and its esters were determined by four bioassays. Except for the tert-butyl ester, 4-CI-IAA and its esters had stronger elongation activity toward Avena coleoptiles than had indole-3-acetic acid. The biological activities of the methyl, ethyl and allyl esters were as strong as the activity of the free acid. All the esters, except for the tert-butyl, inhibited Chinese cabbage hypocotyl growth more than the free acid did, and all the esters induced severe swelling and formation of numerous lateral roots in black gram seedlings even at a low concentration. Furthermore, adventitious root formation was strongly promoted in Serissa japonica cuttings by all the esters. The root formation-promoting activities of the ethyl and allyl esters were about three times the value for indole3-butyric acid which is used to promote and accelerate root formation in plant cuttings.
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