Genetic Analysis of Floral Organ Traits in Hybrid Progenioes of Camellia oleifera
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College of Forestry, Central South University of Forestry and Technology / Hunan Provincial Key Laboratory of the Breeding of Camellia oleifera in Common University / Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees of Ministry of Education, Central South University of Forestry and Technology, Changsha 410004,Hunan

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Foundation projects: Special Funds for the Construction of Innovative Provinces in Hunan (2021NK1007); Program of Young Science and Technology Talent in Hunan Province (2022RC1152); Key Program of Education Department of Hunan Province (20A524)

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    Abstract:

    The study aimed to analyze the degree of variation, heterosis and genetic tendency of floral traits in hybrid progenies of Camellia oleifera. 322 hybrid progenies and their parents (DY2×HS) were analyzed at eight characters, including flower transverse diameter, flower longitudinal diameter, petal number, anthers number, style dehiscence number, stamens group length, style length and pistils length, followed by the genetic variation analysis, test of normality and probability grading, heterosis analysis and cluster analysis. The results showed that: (1) The coefficient of variation ranged from 11.74% to 22.10%, with an average of 16.26%. (2) The normal distribution was observed at the flower transverse diameter, flower longitudinal diameter, anthers number and stamens group length, the bi-modal distribution was detected at the number of petals and style length, and the skewness distribution was detected at style dehiscence number and pistils length. The class III showed highest proportion of frequency distribution with an average of 43.05%, while grade V accounted for the lowest proportion, with an average of 8.07%. (3) The mid-parent heterosis of floral organs ranged from –28.48% to 5.65%, the ultra-high parent heterosis ranged from –49.29% to –9.12%, and the ultra-low parent heterosis ranged from –18.06% to 29.12%. Except for the ultra-high parent heterosis was all negative which suggested a certain degree of heterosis decline, the other two indicators showed a trend of positive and negative bidirectional distribution, among which the style dehiscence number and anthers number were positive in the mid-parent heterosis and the ultra-low parent heterosis, and the advantages were obvious and stable; the style length and the pistils length are positive in the ultra-low parent heterosis. The results of relative heritability showed that the male parent was superior than the female parent in number of anthers and style dehiscence, and the progenies had a paternal tendency. For the remaining 6 quantitative traits, female parent was more dominant and the progenies had a maternal characteristics. (4) The test materials were divided into three groups by cluster analysis, among which the group II had the best comprehensive performance and heterosis utilization value. These results demonstrate that hybrid progeny populations have a high degree of genetic variation and the heterosis of significance, which can provide a reference basis for enriching the comprehensive evaluation system of C. oleifera and screening of excellent individuals early.

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History
  • Received:April 11,2023
  • Revised:May 06,2023
  • Adopted:
  • Online: October 31,2023
  • Published: October 31,2023
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