Heterosis and correlation in interspecific and intraspecific hybrids of cotton

Munir, Sana; Hussain, Sajid; Manzoor, Hamid; Quereshi, M K; Zubair, Muhammad; Nouman, Wasif; Shehzad, Ahmad Naeem; Rasul, Sumaira; Manzoor, Sobia

doi:10.4238/gmr.15028083

Cited by 12 publications

(11 citation statements)

References 18 publications

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“…These results suggest that lint percentage has been selected as a major target in the breeding process of elite parents, and that increased lint index combined with decreased seed index are the primary contributors for increased lint percentage (The seed index was the weight of 100 seeds and the lint index was the lint obtained from 100 seeds. Lint percentage = lint weight/seed cotton weight) (Munir et al ., ).…”

Section: Resultsmentioning

confidence: 97%

Resequencing core accessions of a pedigree identifies derivation of genomic segments and key agronomic trait loci during cotton improvement

Wang

et al. 2018

Plant Biotechnology Journal

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Upland cotton (Gossypium hirsutum) is the world's largest source of natural fibre and dominates the global textile industry. Hybrid cotton varieties exhibit strong heterosis that confers high fibre yields, yet the genome-wide effects of artificial selection that have influenced Upland cotton during its breeding history are poorly understood. Here, we resequenced Upland cotton genomes and constructed a variation map of an intact breeding pedigree comprising seven elite and 19 backbone parents. Compared to wild accessions, the 26 pedigree accessions underwent strong artificial selection during domestication that has resulted in reduced genetic diversity but stronger linkage disequilibrium and higher extents of selective sweeps. In contrast to the backbone parents, the elite parents have acquired significantly improved agronomic traits, with an especially pronounced increase in the lint percentage. Notably, identify by descent (IBD) tracking revealed that the elite parents inherited abundant beneficial trait segments and loci from the backbone parents and our combined analyses led to the identification of a core genomic segment which was inherited in the elite lines from the parents Zhong 7263 and Ejing 1 and that was strongly associated with lint percentage. Additionally, SNP correlation analysis of this core segment showed that a non-synonymous SNP (A-to-G) site in a gene encoding the cell wall-associated receptor-like kinase 3 (GhWAKL3) protein was highly correlated with increased lint percentage. Our results substantially increase the valuable genomics resources available for future genetic and functional genomics studies of cotton and reveal insights that will facilitate yield increases in the molecular breeding of cotton.

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Section: Resultsmentioning

confidence: 97%

Resequencing core accessions of a pedigree identifies derivation of genomic segments and key agronomic trait loci during cotton improvement

Wang

et al. 2018

Plant Biotechnology Journal

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“…Number of bolls in cotton has been reported to be a major yield contributing feature, affecting the hybrid yield (Zeng and Wu, 2012). The higher number of bolls in the cotton hybrids resulted from the collective effect of both the boll retention and fruiting node (Munir et al ., 2016). Mean values for sowing dates revealed that S1 produced maximum bolls while S4 sowing minimum BP.…”

Section: Discussionmentioning

confidence: 99%

Developing short-season cotton genotypes with high harvest index might be an advantageous option under late duration plantings

Iqbal

Khan

Chattha

2020

Plant Genet. Resour.

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Short duration cotton (Gossypium hirsutum L.) cultivar may be more profitable for the growers, as it will have shortened critical growth window for drought, heat and insect pests. Therefore, in the present research work, two cotton advance lines IUB-71 and IUB-73 along with an approved cotton cultivar IUB-13 were tested under four different sowing dates i.e. S1 (25th April), S2 (10th May), S3 (25th May) and S4 (10th June) in 2017 and 2018 under field condition. Field layout was RCBD factorial with four sowing dates as one factor and three cotton genotypes as another factor with three replications. Data were recorded for plant height, total number of nodes, bolls per plant, seed cotton yield (SCY), above ground fresh biomass (AGFB) and harvest index (HI). An overall decreasing trend with increasing sowing dates was observed in all the traits except HI that relatively increased in all the three genotypes. Within each sowing date, a higher value for each trait was observed for genotype IUB-73 except for AGFB might be due to higher reproductive allocation. It is concluded that IUB-73 due to superior SCY and HI specifically under late planting is best fit for short cotton seasons with reduced critical window for cotton management.

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“…Interspecific crosses between upland and Pima cotton produce better fiber traits but disease incidence was a major problem. In contrast, intraspecific hybrids gave stability in production, improved fiber traits, and ensure seed purity [15]. In most cases, positive heterosis is required but for plant height, maturity, and gossypol content negative heterosis is desired in cotton.…”

Section: Introductionmentioning

confidence: 99%

Comparative transcriptome analysis of inbred lines and contrasting hybrids reveals overdominance mediate early biomass vigor in hybrid cotton

et al. 2020

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Background: Heterosis breeding is the most useful method for yield increase around the globe. Heterosis is an intriguing process to develop superior offspring to either parent in the desired character. The biomass vigor produced during seedling emergence stage has a direct influence on yield heterosis in plants. Unfortunately, the genetic basis of early biomass vigor in cotton is poorly understood. Results: Three stable performing F 1 hybrids varying in yield heterosis named as high, medium and low hybrids with their inbred parents were used in this study. Phenotypically, these hybrids established noticeable biomass heterosis during the early stage of seedling growth in the field. Transcriptome analysis of root and leaf revealed that hybrids showed many differentially expressed genes (DEGs) relative to their parents, while the comparison of inbred parents showed limited number of DEGs indicating similarity in their genetic constitution. Further analysis indicated expression patterns of most DEGs were overdominant in both tissues of hybrids. According to GO results, functions of overdominance genes in leaf were enriched for chloroplast, membrane, and protein binding, whereas functions of overdominance genes in root were enriched for plasma membrane, extracellular region, and responses to stress. We found several genes of circadian rhythm pathway related to LATE ELONGATED HYPOCOTYL (LHY) showed downregulated overdominant expressions in both tissues of hybrids. In addition to circadian rhythm, several leaf genes related to Aux/IAA regulation, and many root genes involved in peroxidase activity also showed overdominant expressions in hybrids. Twelve genes involved in circadian rhythm plant were selected to perform qRT-PCR analysis to confirm the accuracy of RNA-seq results. Conclusions: Through genome-wide comparative transcriptome analysis, we strongly predict that overdominance at gene expression level plays a pivotal role in early biomass vigor of hybrids. The combinational contribution of circadian rhythm and other metabolic process may control vigorous growth in hybrids. Our result provides an important foundation for dissecting molecular mechanisms of biomass vigor in hybrid cotton.

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Heterosis and correlation in interspecific and intraspecific hybrids of cotton

Cited by 12 publications

References 18 publications

Resequencing core accessions of a pedigree identifies derivation of genomic segments and key agronomic trait loci during cotton improvement

Resequencing core accessions of a pedigree identifies derivation of genomic segments and key agronomic trait loci during cotton improvement

Developing short-season cotton genotypes with high harvest index might be an advantageous option under late duration plantings

Comparative transcriptome analysis of inbred lines and contrasting hybrids reveals overdominance mediate early biomass vigor in hybrid cotton

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