Abscisic acid levels in shoot apices in relation to tree vigour in mango (Mangifera indica L.).
Kurian R. M., Murti G. S. R., Iyer C. P. A.
Author Affiliation: Indian Institute of Horticultural Research, Bangalore 560?089, India.
Gartenbauwissenschaft 56 : 84-86
Abstract : Slightly higher abscisic acid (ABA) concentrations were found in the shoot apices of the vigorous cultivar Langra than in those of the less vigorous cultivar Kerala Dwarf. Flush length was 30.25 cm in Langra and 10.25 cm in Kerala Dwarf. The ABA content of dormant apical buds was nearly 3 times higher than that of actively growing buds in both cultivars. Trees of cv. Alphonso treated with soil applications of 2.5 g paclobutrazol per tree had lower ABA concentrations (2.28 µg/g FW) than untreated trees (2.80 µg/g FW). These results indicate that ABA does not limit vigour. However, the difference between ABA levels of dormant and actively growing buds suggest that ABA may affect flushing habit and thus influence tree size.