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Quantitative trait locus mapping of growth‐related traits in inter‐specific F1 hybrid grouper (Epinephelus fuscoguttatus x E. lanceolatus) in a tropical climate

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วันที่
2017
ผู้เขียน
Kubota, Satoshi
Longloy, Amphai
Singhabun, Arkom
Khammee, Wanpen
Kessuwan, Kanonkporn
Bunlipatanon, Paiboon
Ozaki, Akiyuki
Silapajarn, Kom
Tanasomwang, Varin
Okamoto, Nobuaki
Sakamoto, Takashi
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นามธรรม
Growth‐related traits are the main target of genetic breeding programmes in grouper aquaculture. We constructed genetic linkage maps for tiger grouper (Epinephelus fuscoguttatus) and giant grouper (E. lanceolatus) using 399 simple sequence repeat markers and performed a quantitative trait locus (QTL) analysis to identify the genomic regions responsible for growth‐related traits in F1 hybrid grouper (E. fuscoguttatus × E. lanceolatus). The tiger grouper (female) linkage map contained 330 markers assigned to 24 linkage groups (LGs) and spanned 1,202.0 cM. The giant grouper (male) linkage map contained 231 markers distributed in 24 LGs and spanned 953.7 cM. Six QTLs affecting growth‐related traits with 5% genome‐wide significance were detected on different LGs. Four QTLs were identified for total length and body weight on Efu_LG8, 10, 13 and 19 on the tiger grouper map, which explained 6.6%–12.0% of the phenotypic variance. An epistatic QTL with a reciprocal association was observed between Efu_LG8 and 10. Two QTLs were identified for body weight on Ela_LG3 and 10 on the giant grouper map, which explained 6.9% of the phenotypic variance. Two‐way analysis of variance indicated that the QTL on Efu_LG13 interacts with the QTLs on Ela_LG3 and 10 with large effects on body weight. Furthermore, these six QTLs showed different features among the winter, summer and rainy seasons, suggesting that environmental factors and fish age affected these QTLs. These findings will be useful to understand the genetic structure of growth and conduct genetic breeding in grouper species.
URI
http://hdl.handle.net/20.500.12067/1041
การอ้างอิง
Kubota, S., Longloy, A., Singhabun, A., Khammee, W., Kessuwan, K., Bunlipatanon, P., ... & Sakamoto, T. (2017). Quantitative trait locus mapping of growth‐related traits in inter‐specific F1 hybrid grouper (Epinephelus fuscoguttatus x E. lanceolatus) in a tropical climate. Aquaculture Research, 48(12), 5913-5927.
เรื่อง
Fish; Genomes; Weight; Aquaculture; Identification; Breeding; Programmes; Variance analysis; Body weight; Growth; Tropical environment; Environmental factors; DNA sequencing; Genetic structures; Epinephelus fuscoguttatus; Mycteroperca tigris; Epinephelus lanceolatus
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