Plus Tree Selection of Fresh Docynia delavayi (Franch.) Schneid.
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1.College of Forestry, Southwest Forestry University, Key Laboratory of Ministry of Education for Conservation and Utilization of Mountain Forest Resources in the Southwest China / Key Laboratory for Forest Genetic and Tree Improvement & Propagation in Universities of Yunnan Province, Kunming 650224;2.Yunnan Province Mojiang Xiqiao Provincial Nature Reserve Management Bureau, Puer 654800

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Foundation projects: The National Natural Science Foundation of China (32060350); The Fund of Ten-Thousand Talent Plans for Young Top-notch Talents of Yunnan Province (YNWR-QNBJ-2020-230)

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    Abstract:

    Docynia delavayi (Franch.) Schneid. is a well-known wild fruit tree in Yunnan Province, whose fruit is rich in nutrients and ideal green fruit. The fruit is rich in tannins, crude fibres and flavonoids, resulting in most of the fruit being sour and difficult to eat fruits directly. The preliminary resource survey of Docynia delavayi (Franch.) Schneid. revealed abundant natural variations on fruit. For example, some of them showed a better taste of sweet juice and crispy flesh. Therefore, this study attempted to screen out the fresh Docynia delavayi. In this study, 100 fresh-feeding plants from Nuozadu Township, Lancang County, Yunnan Province, China, were analyzed for their fruit phenotypes (fruit weight, fruit cross diameter and fruit longitudinal diameter). Based on the average fruit weight of 61.28 g as cutoff, 66 plus plants were obtained, followed by quantifying the quality traits, such as total sugars, total acids, Vc, flavonoids, tannins, crude protein, and crude fibre. There were phenotypic variations at all traits, among which the content of Vc was the most variable with a coefficient of variation of 0.318, and the content of total sugar was the most stable with a high overall consistency with a coefficient of variation of 0.064. Based on the correlation analysis, except for crude protein content that was significantly negatively correlated with flavonoid content, the other indicators were detected with positive or negative correlations without significance. The comprehensive scoring method was used to score and rank the initial selection of superior plants (the higher ranking with better overall quality), and finally the lower limit of significantly lower than average scores was determined according to the one-sample mean hypothesis test. Thirteen fresh-feeding individuals with a total score higher than the lowest lower limit (56.13) were identified, of which the first one was No. 98 with a score of 66 and the best overall performance, and the rest of the plus trees are, in descending order of overall score: 1, 15, 34, 12, 76, 9, 77, 8, 71, 7, 99, 6. Collectively, this study obtained 13 plus trees of Docynia delavayi, thus providing raw material for the future breeding of improved varieties of fresh Docynia delavayi.

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History
  • Received:November 07,2022
  • Revised:December 25,2022
  • Adopted:
  • Online: April 27,2023
  • Published:
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