ISHS Acta Horticulturae 509: VI International Symposium on Mango
REGULATION OF FRUIT SET AND RETENTION IN MANGO WITH EXOGENOUS APPLICATION OF POLYAMINES AND THEIR BIOSYNTHESIS INHIBITORS |
| Authors: | Z. Singh, J. Janes |
| Keywords: | fruit retention, fruit set, inhibitors, polyamines, mango |
| Abstract:
Aqueous solutions of spermine, spermidine and putrescine of different concentrations (10-3, 10-4, 10-5 M) and spermine (10-3, 10-4, 10-5 M) were sprayed onto fully grown panicles prior to the anthesis in "Kensington Pride" and cvs Haden, Kent, Glenn and Kensington Pride of mango (Mangifera indica L.) respectively to study the effects on fruit set and retention. The effects of different concentrations (0, 1, 10, 100, 250 and 500 μM) of DFMO (DL-  -difluoro-methylornithine) or MGBG (methylglyoxal-bisguanyl hydrazone), inhibitors of biosynthesis of polyamines on initial and final fruit set in "Kensington Pride" mango were also studied.
A single spray application of spermine onto the fully-grown panicles prior to the anthesis resulted in higher mean fruit set in ‘Kensington Pride’ as compared to putrescine, and spermidine.
Spermine (10-4M) was most effective in increasing mean fruit set as compared to control and all other treatments.
The improvement in mean fruit set with the spermine treatments varied greatly among different mango cultivars.
The treatment of spermine (10-4 M), when applied onto the fully-grown panicles prior to the anthesis increased fruit set in cvs Haden, Kent and Kensington Pride, where as (10-5 M) was the most effective in stimulating fruit set in Glenn.
The increase in fruit retention with spermine was similar among all the cultivars.
The treatments of inhibitors of biosynthesis of polyamines reduced the initial and final fruit set in "Kensington Pride" mango, when applied onto the fully-grown panicles prior to the anthesis.
Spray application of spermine (10-4 M) onto fully-grown panicles prior to anthesis was most effective in increasing the final fruit retention in all the cultivars.
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