EVALUATION OF GENETIC PARAMETERS FOR LOW TEMPERATURE TOLERANT TRAITS AND GROWTH TRAITS OF TAKIFUGURUBRIPES
The culture area of Takifugu rubripes is primarily concentrated in the northern regions of China,where winter water temperatures fall significantly below the species'optimal growth range.Overcoming the challenges associated with indoor wintering,such as low survival rates and increasing costs,is essential to promote sustainable development in the industry.Consequently,there is an urgent need to develop new varieties with improved cold tolerance.In this study,we evaluated the response of 31 F1 full-sib families to low-temperature stress through controlled temperature manipulation.We quantified low temperature tolerant traits using cooling degree hours(CDH)as a trait.To assess the genetic parameters of both low temperature tolerant traits and growth-related traits,we established mixed linear models.The likelihood ratio is used to verify and compare the different models,and finally model A and model BF are selected.Our findings indicate that CDH heritability for low temperature tolerant trait was estimated at 0.27±0.08,reflecting a medium heritability.Heritability values for body weight(BW)as growth trait was 0.36±0.13 indicating a medium heritability.The heritability of body weight was 0.14±0.06,reflecting a low heritability.These estimates reached a highly significant level(P＜0.01)upon testing.Genetic correlations between CDH and both body weight and body length were-0.40±0.22 and-0.44±0.24,respectively,with phenotypic correlations of-0.09±0.06 and-0.16±0.05,all indicating negative associations.In contrast,the genetic correlation between body weight and body length for growth traits was 0.92±0.05,with a phenotypic correlation of 0.80±0.02,demonstrating a strong positive relationship(P＜0.01).Our results suggest that there is significant potential for improving both low temperature tolerant traits and growth traits in T.rubripes.When developing breeding plans,it is crucial to consider trait correlations.One strategy could involve selecting for low-temperature tolerance and fast growth separately and then crossing to create new varieties with composite traits.This study represents the first comprehensive evaluation of genetic parameters related to low-temperature tolerance in T.rubripes,offering valuable theoretical support for the development of new varieties with improved cold tolerance.
Takifugu rubripeslow temperature tolerant traitsheritabilitygenetic correlation
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