采前喷施纳米钛提升冷藏杨梅品质及其通径分析

为了提升杨梅冷藏品质,本研究采用通径分析方法研究了采前喷施2种粒径(40和60 nm)、2种浓度(0.05%、0.10%)组合处理的金红石纳米TiO₂对冷藏期间杨梅品质及生理生化指标的影响。结果表明,采前喷施60 nm、0.05% 金红石纳米TiO₂,杨梅初始可溶性固形物(TSS)含量比对照组高21.9%,有利于杨梅早熟。冷藏15 d后,杨梅TSS含量比对照组高13.7%,发霉率比对照组低9.5个百分点。采前喷施40 nm、0.10% 金红石纳米TiO₂ 有助于杨梅的表面杀霉,提高杨梅的贮藏性能。冷藏15 d后,杨梅硬度、可滴定酸(TA)和维生素C(Vc)含量分别比对照组高19.5%、33.2%和5.6%,延缓了还原糖(RS)和TSS含量的上升,而发霉率比对照组低19.5个百分点。逐步回归和通径分析结果表明,RS含量是影响冷藏杨梅好果率的决策因子,影响杨梅好果率波动的限制因子是TSS含量,主要通过RS含量的积累而发生间接的负向作用;TA含量是影响冷藏杨梅发霉率和裂软果率的决策因子。本研究结果为促进杨梅早熟以及提高其冷藏性能提供了思路。

Path Analysis of Pre-Harvest Spraying Rutile TiO2 to Enhance the Quality of Summer Storage Myrica rubra

In order to improve the cold storage quality of Myrica rubra, the effects of pre-harvest spray rutile nano TiO₂ with 2 levels of size (40 nm, 60 nm) and 2 levels of concentration (0.05%, 0.10%) on the quality, physiological and biochemical indexes of Myrica rubra during cold storage were studied by the path analysis method. The results showed that spraying 60 nm, 0.05% rutile nano-TiO₂ before harvest, the total soluble solid (TSS) content of Myrica rubra was 21.9% higher than that of the control group, which was conducive to early maturity of Myrica rubra. The TSS content of Myrica rubra after 15 days cold storage was 13.7% higher than that of the control group, and the moldy rate was 9.5 percent point lower than that of the control group. Spraying 40 nm, 0.10% rutile nano-TiO₂ on the surface of Myrica rubra could kill mold and improve its storage property. The hardness, TA and Vc content of the Myrica rubra after 15 days cold storage were 19.5%, 33.2% and 5.6% higher than those of the control group, respectively, which delayed the increase of reducing sugar(RS)and TSS content. And the moldy rate of the Myrica rubra was 19.5 percent point lower than those of the control group. The results of stepwise regression and path analysis showed that RS content was the decision factor affecting the good fruit rate of cold storage Myrica rubra, and the TSS content was the limiting factor affecting the fluctuation of good fruit, which mainly played an indirect negative effect through the increase of RS content. The content of TA was a decision factor affecting the moldy rate and soft fruit cracching rate of cold stored Myrica rubra. The results of this study provide a way to promote the early maturity of Myrica rubra and improve its cold storage properties.