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Effects of Plastic Tunnel Culture on Growth and Quality of ’Cuiguan’ Pear

Author: ChenLuLu
Tutor: ZuoYuanWen
School: Zhejiang University
Course: Pomology
Keywords: Greenhouse cultivation ' Cuiguan ' pear Color Organic acids Soluble sugar Sucrose - metabolizing enzymes Reflective film Fruit quality
CLC: S628
Type: Master's thesis
Year: 2011
Downloads: 49
Quote: 0
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Abstract


The pear is 'Cuiguan' Pear (Pyrus pyrifolia Nakai), adaptability, excellent agronomic characters, spread rapidly in recent years all over the province. Greenhouse pear has the advantage of regulating fruit ripening, increase efficiency, and the prevention of natural disasters in coastal areas within the developed rapidly. However, studies have shown that the prevalence of greenhouse cultivation decline in fruit quality. To solve this problem, we have two consecutive years to greenhouses' Cuiguan 'pear as experimental materials to study the impact of greenhouse cultivation of its fruit quality and relative physiological and laying on the ground in the greenhouse silver reflective film study on greenhouse' Cuiguan 'glucose metabolism and Quality, aims to provide a scientific basis for the realization of the varieties in the greenhouse cultivation under the conditions of high-quality production. The main results are as follows: 'Cuiguan' pear fruit growth curve \Colorimeter measured apparent color of the fruit, greenhouse cultivation fruit saturation (C) increase the brightness (L *) decreased. Compared with the control greenhouses 'Cuiguan' If the number of points of the surface of the pear fruit decreased significantly, the fruit spot diameter and density were lower than the control. The greenhouse cultivation does not affect the hardness of the fruit ripening. Harvest, greenhouse 'Cuiguan' pear soluble solids content (TSS) was significantly lower than the open field, and malic acid, citric acid and total acid content were significantly higher than in open field. The greenhouse cultivation reducing the soluble sugars, especially sucrose content of 'Cuiguan' pear fruit fructose, sorbitol, glucose and sucrose. Sucrose accumulation occurs mainly in the stage of fruit development, the accumulation of greenhouse pear sucrose was significantly lower than the open field. The analysis showed that sucrose phosphate synthase (SPS) and sucrose accumulation in the highest correlation (greenhouse cultivation r = 0.908 ** control r = 0.858 *), in the fruits of growth and development of late continued to rise as the sucrose content of SPS activity increased significantly. Followed by neutral invertase (NI), the correlation with the sucrose -0.739 * (greenhouses) and -0.467 (open field). Sucrose synthase (SS), acid invertase (AI) and fruit sucrose accumulation in low correlation. Therefore, the decline in greenhouse pear fruit sucrose content may be a result of SPS activity decreased and NI activity increased. Greenhouse floor silver reflective film can be improved within the canopy, especially in the lower part of the canopy light conditions, improve leaf photosynthesis intensity. Filming shed 'Cuiguan' pear fruit TSS significantly increased fruit weight and hardness is slightly higher than the control, but the difference was not significant. The laying of the membrane treatment also changed the proportion of the fruit sugar component the four soluble sugar content higher than that of the control, in particular, the sucrose content of the differences reached statistical significant level. Detected five sucrose metabolism enzymes, the Filming sucrose phosphatase (SPS) activity higher than that of the control, invertase (NI) activity lower than that of the control. Filming qualitative change of light may induce phytochrome regulation of sucrose-metabolizing enzymes, promote and sucrose metabolizing enzymes SPS and NI activity changes. In summary, greenhouse cultivation to some extent, improve the 'Cuiguan' fruit appearance, but reduced the content of soluble sugar content, especially sucrose, organic acid content, reducing the inherent quality of the fruit. By reflective film laying the ground in the greenhouse, can improve the the canopy lighting conditions, increased soluble sugar content, thereby increasing the greenhouse the 'Cuiguan' the inherent quality of the pear.

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