Genetic analysis of fruit shape traits at different maturation stages in sponge gourd |
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Authors: | Zhang Sheng Hu Jin Zhang Cai-fang Guan Ya-jing Zhang Ying |
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Institution: | (1) Department of Agronomy, Zhejiang University, Hangzhou, 310029, China |
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Abstract: | The fruit shape is important quantitative trait closely related to the fruit quality. However, the genetic model of fruit
shapes has not been proposed. Therefore, in the present study, analysis of genetic effects for fruit shape traits (fruit length
and fruit perimeter) in sponge gourd was conducted by employing a developmental genetic model including fruit direct effects
and maternal effects. Analysis approaches of unconditional and conditional variances were applied to evaluate the genetic
behavior of fruit shape traits at economical and physiological maturation times. The results of variance analysis indicated
that fruit length and fruit perimeter were simultaneously affected by fruit direct genetic effects and maternal effects. Fruit
direct genetic effects were relatively more important for fruit shape traits at whole developmental period. The gene expression
was most active at the economical maturation stage (1∼12 d after flowering) for two shape traits, and the activation of gene
was mostly due to direct dominance effects at physiological maturation stage (13∼60 d after flowering). The coefficients due
to different genetic effects, as well as the phenotypic correlation coefficients, varied significantly between fruit shape
traits themselves at various maturation stages. The results showed that it was relatively easy to improve fruit shape traits
for industrial purpose by carefully selecting the parents at economical maturation stage instead of that at physiological
maturation stage.
Project supported by the National Natural Science Foundation of China (No. 30370911) and the Science and Technology Department
of Zhejiang Province (No. 2005C32001), China |
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Keywords: | Fruit length Fruit perimeter Genetic effects Genetic variance Luffa cylindrical Roem |
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