Regulation of fruit set and retention in mango with exogenous application of polyamines and their biosynthesis inhibitors.
Zora Singh, Janes J.
Author Affiliation: Department of Horticulture, Curtin University of Technology, GPO Box U 1987, Western Australia 6845, Australia.
: 675-680
Abstract : Aqueous solutions of spermine, spermidine and putrescine (10-3, 10-4, 10-5 M) were applied to Kensington Pride panicles prior to anthesis, and spermine (10-3, 10-4, 10-5 M) was sprayed onto fully grown panicles prior to anthesis in Haden, Kent, Glenn and Kensington Pride mangoes to study effects on fruit set and retention in Western Australia, Australia. The effects of different concentrations (0, 1, 10, 100, 250 and 500 µM) of DFMO (DL-?-difluoro-methylornithine) and MGBG (methylglyoxal-bisguanyl hydrazone), inhibitors of polyamine biosynthesis, on initial and final fruit set in Kensington Pride were also studied. Application of spermine resulted in higher mean fruit set in Kensington Pride compared with putrescine and spermidine. Spermine (10-4 M) was most effective in increasing mean fruit set compared with the control and other treatments. Spermine-induced improvement in mean fruit set varied with cultivar, with 10-4 M spermine best in Haden, Kent and Kensington Pride, and 10-5 M spermine the most effective in stimulating fruit set in Glenn. The inhibitors of polyamine biosynthesis reduced initial and final fruit set in Kensington Pride when applied to fully-grown panicles prior to anthesis.