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Accueil du site → Doctorat → Chine → 2020 → Genetic Basis of Cotton Response to Drought Stresses Revealed by Field Performance and Image-based Traits through Phenotyping Platform

Huazhong Agricultural University (2020)

Genetic Basis of Cotton Response to Drought Stresses Revealed by Field Performance and Image-based Traits through Phenotyping Platform

李保奇;

Titre : Genetic Basis of Cotton Response to Drought Stresses Revealed by Field Performance and Image-based Traits through Phenotyping Platform

Auteur : 李保奇;

Grade : Doctoral Dissertation 2020

Université : Huazhong Agricultural University

Résumé partiel
Drought resistance is a complex quantitative trait regulated by both genetics and environments.Although cotton is a relatively drought-resistant economic crop,the shortage of water resources has become an important factor restricting the yield and quality of cotton,for that the cotton growing area is gradually moving to the arid north-west region with global warming and the change of crop-planting structure in China.Studying the mechanism of drought resistance,cloning drought-resistant genes and then applying them to cotton breeding is the effective way to solve the shortage of water in the cotton field.At present,the process of discovering and applying drought-resistant genes in cotton is slowly.Although there are some reports on regulatory and functional genes,the progress of researches on drought resistance in cotton still lags behind major food crops,such as maize,rice and wheat.Due to the long growth period,the evaluation index of cotton drought resistance has always been a big problem for researchers.In the current study,a natural population of upland cotton accessions(Gossypium hirsutum Linn.)was used,either to obtain agronomic traits,yield and fiber quality in the field under water-controlled treatment,or to collect a large amount of digital phenotypic indices in greenhouse under drought stress treatment through a phenotyping platform.Combining genome resequencing and transcriptome sequencing data with phenotypic data,genome-wide association study(GWAS)was used to identify important loci and candidate genes related to cotton drought response.The main findings are as follows:1.Comprehensive drought resistance related traits study and association analysis of cotton drought-related traits in fieldIn this study,a natural population consisting of 517 upland cotton accessions were selected for water-limited experiments and association analysis.The water-limited treatment panel was supplied with 50% the water volume of the controls during the whole growth season.A total of 18 traits including agronomic traits,fiber yield indices and fiber quality indices,were investigated at two locations in two years.The phenotypic data were analyzed by BLUP and the drought resistance coefficient of each trait was calculated.

Mots clés : cotton; drought resistance; phenotypic plasticity; genome resequencing; phenotyping platform; i-traits; GWAS;

Présentation (CNKI)

Page publiée le 15 juin 2021, mise à jour le 22 octobre 2021