壳聚糖对番木瓜结果期果实干物质及重要内含物的影响

以番木瓜日升中白皮为试材，研究不同浓度的壳聚糖对番木瓜结果期果实干重、可溶性固形物、可溶性糖、蛋白质、总酸含量及糖酸比的影响。结果表明：①开花期喷施壳聚糖，番木瓜结果70d内的单果重增长速率低于清水对照，但70d后壳聚糖处理的果重继续增加，而清水对照则停止增长，成熟时（结果第90～110d）壳聚糖处理的果重显著高于对照；②壳聚糖处理的可溶性固形物、可溶性糖、蛋白质和有机酸含量整个结果期间均高于对照（除第90～110d的蛋白质外），它们快速增长期的速率均高于对照；③壳聚糖处理后番木瓜果实的糖酸比，前期（第10～50d）显著低于对照，但后期（第50～117d）均显著高于对照。初步得出，壳聚糖有助于番木瓜果实干物质及重要内含物的积累，有助于增加果实的优良口感，以0.5 mg/mL为最适。

Effect of Chitosan on Total Dry Weight and Contents of Important Materials in Papaya Fruit During Fruiting Period

In order to study the influence laws of chitosan on fruit growing in papaya, different concentrations of 0, 0.1, 0.5 and 1.5 mg/mL were sprayed onto leaves during flowering period, based on variety of‘Sun-Rise mid-white skin’papaya, total dry weight and contents of important materials including soluble solid, soluble sugar, protein, organic acid and ratio of sugar and acid in papaya fruit during fruiting period were studied. The results indicated:①the dry weight of per fruit under chitosan treatment increased more quickly and longer than control group during fruiting period, so the dry weight at last was higher significantly, increasing by 20.44%.②During the whole fruiting period the contents of soluble solid, soluble sugar, protein and organic acid of papaya fruit under chitosan treatment were higher than control group except protein from 90th to 110th. Their speed during quick-growing was much higher than control.③The ratio of sugar and acid under chitosan treatment was lower during 10th to 50th but higher during 50th to 117th than control. In short, the chitosan treatment was helpful on increasing the dry weight and contents of important materials of papaya fruit, was helpful on improving the taste of papaya fruit, the optimal concentration was 0.5 mg/mL.