ISHS Acta Horticulturae 231: II International Symposium on Mango
ROLE OF MALFORMINS IN THE FLORAL MALFORMATION OF MANGO |
| Authors: | L.D. Bist, S. Ram |
| Abstract:
Malformin-like factors M1, M2 and M3 were isolated from malformed panicles of mango cv. Dashehari. The factor M3, after acid hydrolysis, resolved into 4 different amino acids, namely, cystine, valine, leucine and isoleucine and appeared to be a cyclic pentapeptide. Malformed panicles possessed malformin-like substances and the healthy panicles did not. The malformin activity increased and decreased rapidly in malformed panicles corresponding with growth and cessation of the panicles. Application of antimalformins controlled malformation by counteracting malformin production in the panicles. The treatment of 650 ppm glutathione, 1055 ppm ascorbic acid, 560 ppm K2S2O5, 2100 ppm AgNO3 and 200 ppm NAA on malformed panicles, starting from their emergence (4-6 cm long panicle), increased the percentage of fruiting panicles, number of fruits per panicle and fruit quality. Per cent malformed panicles, converting into healthy ones after application of 560 ppm glutathione, 1055 ppm ascorbic acid, 560 ppm K2S2O5, 2100 ppm AgNO3 and 200 ppm NAA were 86.6, 93.3, 93.3, 93.3, 80.0 and 40.0 respectively. The malformed panicles treated with 2240 ppm glutathione, 2110 ppm ascorbic acid, 140 ppm K2S2O5 and 600 ppm AgNO3 did not produce malformins and fruited. A hypothesis is presented on the role of malformins in the causation of floral malformation. | |
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