In vivo role of indole-3-acetic acid, gibberellic acid, zeatin, abscisic acid and ethylene in floral malformation of Mangifera indica L.
Singh Z., Dhillon B. S.
Author Affiliation: Department of Horticulture, Punjab Agricultural University, Ludhiana 141?004, Punjab, India.
Journal of Phytopathology 128 : 235-245
Abstract : The endogenous levels of indole-3-acetic acid (IAA), gibberellic acid (GA3), zeatin, abscisic acid (ABA) and ethylene were studied in panicles/shoots of Dusheri mango at 4 stages viz., (1) fully swollen buds; (2) bud inception; (3) fully grown panicles prior to full bloom and (4) fully grown panicles at full bloom, for 3 consecutive years. The malformed panicles and the shoots bearing malformed panicles (SBMP) possessed lower levels of IAA in relation to healthy panicles and shoots bearing healthy panicles (SBHP) at stage, 1, 2, 3 and 4. The malformed panicles and SBMP maintained lower levels of GA3 than healthy panicles and SBHP at stage 1. However, the converse was true for stages 2, 3 and 4. The malformed panicles and SBMP exhibited higher levels of zeatin compared with their healthy counterparts at the 4 developmental stages. Likewise, the contents of ABA and ethylene were also higher in malformed panicles and SBMP than healthy panicles and SBHP at all the stages. It is concluded that floral malformation is associated with malformin stimulated ethylene production and higher levels of ABA, gibberellic acid, zeatin and lower levels of IAA.