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Study On The Postharvest Physiology And Storage Characteristic Of Seedused Pumpkin

Posted on:2004-05-06Degree:MasterType:Thesis
Country:ChinaCandidate:Y X LiuFull Text:PDF
GTID:2121360095450694Subject:Food Science
Abstract/Summary:PDF Full Text Request
Based on seed-used pumpkin of QingYang area in GanSu Province, storage characteristic, mature characteristic of pumpkin seed, physiological & biochemical characteristic and influence to flesh and seed quality by temperature after harvest were studied in 2001 and 2002. The difference between 10 , 5 , room temperature and storage time were analyzed, physiological & biochemical rule and mature & senescence mechanism of seed-used pumpkin were discussed. The best time of drawing out seeds was brought forward. All results would be theoretical basis and technology for full using of seed-used pumpkin.In the course of storage of seed-used pumpkin, respiration rate and release of ethylene is up trended in collectivity. But the highest is not appearing at the same time. By analysis of variance, storage time have marked influence to respiration rate but not to release of ethylene, the temperature have no marked influence to respiration rate and release of ethylene.Seed-used pumpkin relative electrical conductivity and membrane peroxidation increased because of senescence after harvest. There are affinity between activities of SOD, contents of MDA and cell membrane permeability. Along with decrease of activities of SOD, contents of MDA were accumulated; cell membrane permeability was increase incessantly. Senescent indexes and anti-senescence abilities have marked difference of different part, activities of SOD in flesh were higher than that in pulp, but contents of MDA and accumulation of soluble protein were on the contrary. Increase and decrease tendency of activities of POD were found in flesh and pulp of seed-used pumpkin.Study proved that cankered index of seed-used pumpkin showed increased tendency. Cankered index in 10 was higher than 5 and room temperature; weightlessness rate connection is 5 >room temperature>10 ; weight ratio with seed and flesh is between 0.04%~0.06%, there were no obvious increased tendency; characteristic index of seeds were between 14.3mm and 21.3mm in vertical length,6.9mm~11.3mm in transverse length, 2.1mm~3.6mm in thickness, 1.8~2.2 in vertical and horizontal length ratio, thethickness increased ceaselessly, formal dimension changed obviously; weights of 1000 seeds were between 240g and 340g, the highest weight in three temperatures was when they were stored to 30 days.The content of protein in seed showed obviously different, and behaved decreasing; content of fat decrease from 47.8% to 37%; water content decreased from 36.6% to 30.3%. Rigidity of flesh outside increased ceaselessly, but inside decrease; the content of soluble solid in flesh show single apex; the content of total acid and water decrease constantly alone with the increasing of the storage time.The paper was first systematically studied on the post-harvest physiology and storage characteristic of seed-used pumpkin in China. It brought forward seed-used pumpkin belonging to respiration climacteric. The best time of drawing out seeds was storaging 30 days after harvest.
Keywords/Search Tags:seed-used pumpkin, storage, physiology after harvest, mature characters
PDF Full Text Request
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