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| Olive fruit traits and quality changes at different canopy position |
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| DOI： |
| KeyWord:olive different canopy position phenotypic trait oil content fatty acid composition |
| FundProject:攀西特色作物研究与利用四川省重点实验室开放基金项目（SZKF2208）；四川省科技计划资助（2020YFH0207） |
| Author Name | Affiliation | | YUAN Xiaohu1，ZHENG Caixia1，TONG Zhaoguo2,3，SU Guangcan2，WANG Anyi2，
LIU Huanping1，HUANG Yong2，ZHANG Zhiliang1，YANG Zeshen2 | （1.College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University,
Ya′an 625014, Sichuan, China
2.Liangshan Zhongze New Technology Development Co. , Ltd. ，
Xichang 615000, Sichuan, China
3.College of Agricultural Sciences,
Xichang University，Xichang 615000, Sichuan, China） |
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| Abstract: |
| In order to provide theoretical basis for improving canopy position productivity and its tree shaping and pruning, disease and pest control, the main olive varieties Koroneiki, Coratina, Arbosana and Ezhi No. 8 in Liangshan Prefecture, Sichuan Province were used as the research objects, the changes of phenotypic traits, oil content, moisture content of fruit, and acidity (based on free oleic acid content), fatty acid composition and relative content of olive oil of four varieties of olives in the upper, middle and lower canopy were investigated, and a comprehensive evaluation was made using the principal component analysis method and Entropy Weight Technique for Order Preference by Similarity to Ideal Solution (EW-TOPSIS). The results showed that with the canopy position from the bottom to the top, different varieties of olive single mass, fruit transverse diameter, fresh fruit oil content and the relative content of unsaturated fatty acids showed an increasing trend, while the fruit shape index, fruit hardness, acidity and the relative content of saturated fatty acids showed a decreasing trend; the moisture content of fresh olive fruits of different varieties was the lowest in the upper position of the tree. The results of the principal component analysis and the evaluation of the EW-TOPSIS indicated that the upper canopy of the same variety had the highest composite score, followed by the middle one and the smallest one in the lower position, in which the upper position of Ezhi No. 8 had the highest composite score in the principal component analysis, and the upper position of Coratina had the highest composite score in the EW-TOPSIS. In conclusion, the fruit traits and quality of the upper position of olive tree are better than that of the middle and lower parts, and in the process of shaping and pruning, different degrees of shaping and pruning should be carried out on different canopy layers to improve the canopy productivity by improving ventilation and light transmission, and preventing pests and diseases. |
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