Changes in the levels of endogenous hormones in relation to shoot vigour in mango (Mangifera indica L.).
Murti G. S. R., Upreti K. K.
Author Affiliation: Plant Hormones Laboratory, Indian Institute of Horticultural Research, Hessaraghatta Lake P.O., Bangalore 560 089, India.
Plant Physiology & Biochemistry (New Delhi) 25 : 167-171
Abstract : The shoot growth and changes in endogenous growth regulator levels, IAA, gibberellins, ABA and ethylene production were monitored at 10-day intervals from bud burst, in the growing shoots of two mango cultivars, Totapuri and Rumani, growing at Hessaraghatta, Bangalore, India, during 1992. Although the pattern of shoot growth was similar in both the cultivars, the magnitude and rate of shoot growth were higher in cv. Totapuri than in cv. Rumani. The shoots of high vigour cv. Totapuri showed higher IAA content, IAA:ABA ratio and gibberellin activity but lower ABA levels at most of the growth stages than the less vigorous cv. Rumani. The concentrations of IAA and gibberellins were higher in the shoots of both the cultivars during the active growth phase while that of ABA was greater at a later phase when the shoot growth levelled off. Ethylene production appears to be unrelated to differential vigour of the cultivars of mango.