Studies on minimizing dextran problems in sugar cane under subtropical conditions
1994
Sharma, K.P. (PAU Sugarcane Research Station, Jalandhar (India)) | Batta, S.K. | Singh, R.
The natural occurrence of pre-harvest dextran in fresh sugar cane grown at three geographically diversed locations in Punjab, India, was studied over a two-year period. Incidence of dextran ranged from 20 to 100 '%' at Jalandhar whereas no dextran was detected in cane at other locations. Dextran levels associated with genotypes over all locations varied widely but differences were not significant. There was a trend of reduced dextran content in the test varieties with medium levels of sugar compared to levels reported in subtropical areas. In post-harvest studies, the rate of change of weight loss, sucrose decline, and dextran development were predicted by regression equations for two genotypes during 7 days of storage at 20 or 30 degrees C. The rate of weight loss was 1.48 '%' for CoJ 64 and 1.25 '%' for CoJ 79 per day stored at 20 degrees C and 3.00 and 2.12 '%' per day, respectively, for canes stored at 30 degrees C. Cold storage significantly reduced the rate of sucrose loss and dextran development in both varieties. Rate of post-harvest losses was significantly lower in CoJ 79 than in CoJ 64 at both temperatures.
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