IJSRP, Volume 5, Issue 4, April 2015 Edition [ISSN 2250-3153]
Sumathi Manoharan, Seshadri Shivashankar, Sathisha G.J
Corky tissue of sapota cv.Cricket Ball (Manilkara achras) is a major physiological disorder distinguished by the occurrence of starchy lumps coupled with lower sugar levels in ripening pulp. Since sugar content of pulp is one of the major determinants of sapota fruit quality, a reduction in sugar level in CT fruit coupled with the buildup of starch unfavorably impacts fruit quality. In view of this, the present study was carried out with the objective of determining the possible reasons for the disturbance in starch metabolism in corky tissue affected fruits of sapota. Changes in the activities of starch hydrolyzing enzymes, sugar and starch contents, and tissue concentrations of Zn and P in healthy, apparently healthy and CT affected fruit tissues were measured to assess the potential interrelationships among them. Results indicated that the activities of starch phosphorylase and α-amylase enzymes in CT pulp were significantly lower (P≤0.005) compared to AH and healthy pulp.