Related Experiment Video
Updated: May 17, 2025

The Use of Induced Somatic Sector Analysis ISSA for Studying Genes and Promoters Involved in Wood Formation and Secondary Stem Development
Published on: October 5, 2016
Analysis of combining ability and heterosis based on controlled pollination populations of eucalypt
Zhiyi Su1, Wanhong Lu2, Haoyang Cao1
1Research Institute of Fast-Growing Trees, Chinese Academy of Forestry, 30 Mid Renmin Dadao, Zhanjiang, 524022, Guangdong, China.
Abstract:
Artificial hybridization remains the most effective method for genetic improvement of eucalypt, though limited research exists on the genetic basis of heterosis for interesting traits in Chinese eucalypt. We attempted to use Python in combined with SAS and SPSS to explore the relationship between parental combining ability and heterosis in controlled pollination populations of eucalypt. Our results indicated that E. urophylla had the highest general combining ability (GCA). The special combining ability (SCA) of U3423 × 3327, 06H16 × LL131, and H0733 × U6 were the highest. H0733 × U6, H0733 × P9060, and (E. urophylla × E. grandis) × 06H241 had the strongest mid-parent heterosis (MPH). U3423 × 3327, U952 × C2232, and (E. urophylla × E. grandis) × 06H241 had the strongest high-parent heterosis (HPH). We found that completely controlled by non-additive effects were (E. tereticornis × E. urophylla) × (E. urophylla), E. urophylla or (E. urophylla × E. grandis) × (open pollination). Fully controlled by additive effects were (E. tereticornis × E. urophylla) × E. camaldulensis or E. grandis, (E. urophylla) × (E. pellita × E. tereticornis), (E. urophylla × E. grandis) × E. pellita or E. tereticornis. All the findings in the present research explained the genetic basis of heterosis in eucalypt growth, and enriched the theory of hybrid breeding in eucalypt.
More Related Videos
Related Concept Videos
Incomplete Dominance
Chi-square Analysis
The chi-square test was developed by Pearson in 1990.
The first step of performing a Chi-square analysis is to establish a null hypothesis, which assumes that there is no real...
Dihybrid Crosses
Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal...
Test Cross
Epistasis Analysis

