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| 1 | Role of SNPs in determining QTLs for major traits in cotton显示文摘A single nucleotide polymorphism is the simplest form of genetic variation among individuals and can induce minor changes in phenotypic,physiological and biochemical characteristics.This polymorphism induces various mutations that alter the sequence of a gene which can lead to observed changes in amino acids.Several assays have been developed for identification and validation of these markers.Each method has its own advantages and disadvantages but genotyping by sequencing is the most common and most widely used assay.These markers are also associated with several desirable traits like yield,fibre quality,boll size and genes respond to biotic and abiotic stresses in cotton.Changes in yield related traits are of interest to plant breeders.Numerous quantitative trait loci with novel functions have been identified in cotton by using these markers.This information can be used for crop improvement through molecular breeding approaches.In this review,we discuss the identification of these markers and their effects on gene function of economically important traits in cotton. | MAJEED Sajid RANA Iqrar Ahmad ATIF Rana Muhammad ALI Zulfiqar HINZE Lori AZHAR Muhammad Tehseen | 2019 | Journal of Cotton Research2019，2，1： | 2 |
| 2 | Phenotypic plasticity and genetic variation of cotton yield and its related traits under water-limited conditions显示文摘Global warming is limiting availability of water resources in arid and semi-arid regions,and so understanding water use efficiency(WUE)is increasingly important for agricultural production in those areas.As China is the largest cotton producing area,the problem of balancing WUE and efficient cotton production is a major issue.In this study,we used a natural population of 517 Upland cotton accessions to conduct a water-controlled trial in south and north of Xinjiang over two years.A total of 18 traits including agronomic traits,fiber yield indices and fiber quality indices,were investigated for broad-sense heritability and coefficient of variation.Appropriate water limitation was found to promote the establishment of favorable agronomic traits in cotton,associated with an increased cotton yield of 8.46%in Xinjiang,at the expense of a certain degree of fiber quality,such as decreased fiber length and an over-higher micronaire value.We detected 33 QTL related to response to water limitation using a drought resistance coefficient(DRC),and 6 QTL were found using a comprehensive indicator of CIDT(comprehensive index of drought tolerance)at the genetic level by integrating resequencing data.Two novel QTL-hotspots including six differentially expressed genes(DEGs)were further identified related to the drought response of cotton.These findings not only suggested a new approach to irrigation of cotton fields in Xinjiang,but also provided abundant genetic evidence for genetic breeders to study drought improvement of crops. | Baoqi Li Qin Tian Xuwen Wang Bei Han Li Liu Xianhui Kong Aijun Si Juan Wang Zhongxu Lin Xianlong Zhang Yu Yu Xiyan Yang | 2020 | The Crop Journal2020，8，6： | 1 |
| 3 | 陆地棉种质资源株型相关性状鉴定与分析评价显示文摘为了对棉花的株型相关性状进行鉴定与分析评价,本研究以收集的不同区域来源的315份陆地棉种质资源为研究对象,通过一年四个环境下三个株型相关性状,株高(Plant height,PH)、果枝夹角(Fruit branch angle,FBA)和果枝长度(Fruit branch length,FBL)的精准表型鉴定,对三个性状进行变异度、相关性、方差、聚类等分析与评价。结果表明,PH、FBA和FBL的变异度范围分别在11.02%~15.92%、4.67%~7.51%和17.42%~28.54%之间,且各性状之间存在极显著(P<0.01)相关性;三个性状在基因、环境和基因×环境互作中存在极显著(P<0.01)差异性,且PH、FBA和FBL在四个环境下的广义遗传力(hB2)分别为72.51%、25.12%和53.40%。当欧氏距离为30时,315份陆地棉种质资源根据三个株型性状被聚为Ⅰ(66份材料)、Ⅱ(25份材料)、Ⅲ(224份材料)三个大类群。区域差异性分析表明,PH在六个不同区域的材料间呈现出显著性(P<0.05)差异,FBA和FBL在不同区域之间的差异不显著;当欧氏距离为20时,来自USA的材料被单独划分为一个类群;当欧氏距离为15时,西北内陆棉区的材料也单独聚为一个类群。棉花株型相关性状的变异度相对较小,且遗传力相对较低。在棉花株型育种过程中,要重点利用美国材料做亲本,六个不同区域之间要加强种质资源引进、交流与利用,以改良本土品种的株型结构。本研究结论为机采棉株型遗传育种提供重要的理论依据和参考信息。 | 马麒 徐守振 宁新柱 陈红 谢斌 李吉莲 林海 | 2022 | 绿洲农业科学与工程2022，8，2： | 0 |
| 4 | A case study of a micro-inversion event in dark brown fibre cotton(Gossypium hirsutum)显示文摘Structural variation is a major type of genetic variation that can potentially induce powerful genetic effects.In this study,we examined the Inv(A07)p1.09 p2.23 genetic inversion in brown fibre cotton at the individual and population genetics levels.A dark-brown fibre mutant that resulted from a distant hybridization between Gossypium barbadense and G.hirsutum,and a natural population including 30 dark-brown,70 light-brown and 21 white fibre cotton accessions were collected to perform a functional study of this micro-inversion.The results showed that Inv(A07)p1.09 p2.23 can be detected by high-throughput resequencing method,and induce micro-deletion,gene disruption(Ghir_A07 G000980)and abnormal gene expression in the breakpoint regions.Inv(A07)p1.09 p2.23 existed in only dark-brown fibre cotton,had undergone negative selection in elite brown fibre cultivars,and was significantly associated with fibre colour and nine fibre traits.In the Inv(A07)p1.09 p2.23 region,nucleotide diversity was lower,recombination was absent,and linkage disequilibrium was higher.Overall,this inversion event in dark-brown fibre cotton produced significant genetic effects,and this study will guide us to better understand the genetic effects of inversion events in dark-brown fibre cotton. | Tianwang Wen Tian Yao Chunyuan You Zhongxu Lin | 2020 | The Crop Journal2020，8，4： | 0 |
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