Distribution and evolution of cotton fiber development genes in the fibreless Gossypium raimondii genome

Abstract

Cotton fiber represents the largest single cell in plants and they serve as models to study cell development. This study investigated the distribution and evolution of fiber Unigenes anchored to recombination hotspots between tetraploid cotton (Gossypium hirsutum) At and Dt subgenomes, and within a parental diploid cotton (Gossypium raimondii) D genome. Comparative analysis of At vs D and Dt vs D showed that 1) the D genome provides many fiber genes after its merger with another parental diploid cotton (Gossypium arboreum) A genome although the D genome itself does not produce any spinnable fiber; 2) similarity of fiber genes is higher between At vs D than between Dt vs D genomic hotspots. This is the first report that fiber genes have higher similarity between At and D than between Dt and D. The finding provides new insights into cotton genomic regions that would facilitate genetic improvement of natural fiber properties.

Genetic Evaluation of Exotic Chromatins from Two Obsolete Interspecific Introgression Lines of Upland Cotton for Fiber Quality Improvement

“…The correlation observed among fiber quality traits may be the direct result of colocalization of fiber quality QTLs. Similar results were previously reported in cotton (Jiang et al, 1998;Paterson et al, 2003;Mei et al, 2004;Chee et al, 2005b;Rong et al, 2007;Yu et al, 2013;Xu et al, 2015), where the genetic control of fiber quality by the D t subgenome was significantly greater than that of A t subgenome. Another noteworthy observation is that 16 (or 57%) of the fiber quality QTLs were identified on D t subgenome.…”

“…Although the D subgenome progenitor did not produce spinnable fibers, it has loci that influence the quality of the fiber produced in allotetraploid cottons, which indicates that the polyploidization of Gossypium has given rise to novel variation for fiber quality traits (Jiang et al, 1998;Wendel, 2000). Similar results were previously reported in cotton (Jiang et al, 1998;Paterson et al, 2003;Mei et al, 2004;Chee et al, 2005b;Rong et al, 2007;Yu et al, 2013;Xu et al, 2015), where the genetic control of fiber quality by the D t subgenome was significantly greater than that of A t subgenome.…”

Transcription factors and molecular markers revealed asymmetric contributions between allotetraploid Upland cotton and its two diploid ancestors

“…Additionally, they did not have the same contribution to G. hirsutum, especially in fiber-and stress-associated TFs. The findings in this study for TFs are in accordance with another that reported that A and D genomes do not equally contribute and D genome (G. raimondii) provides more genes than A genome (G. arboreum) (Xu et al 2015). Therefore, they might share less genes with each other than with G. hirsutum.…”

Genomic insight into the biogeographic history, divergence, and adaptive potential ofG. purpurascens, a forgotten landrace ofG. hirsutum

“…In the case of G hirsutum, D-genome has a significant association of QTLs related to adaption i.e., BOD, DF, and FY, while A-genome has comparatively more associations for traits related to fiber quality. These results are in line with the A and D genome evolution (Xu, Yu et al, 2015).…”