We are glad that four articles have been published online. Prof. LI Fuguang, Editor-in-Chief, announced the launch of JCR, and descripted the objective of launching JCR.
In Genome-wide identification and expression analysis of Gossypium RING-H2 finger E3 ligase genes revealed their roles in fiber development, and phytohormone and abiotic stress responses, QANMBER Ghulam et al. found that RING-H2 finger E3 ligase (RH2FE3) genes encode cysteine-rich proteins that mediate E3 ubiquitin ligase activity and degrade target substrates. 140 G. hirsutum, 80 G. arboreum, and 89 G. raimondii putative RH2FE3 genes were identified. The authors all found that G. hirsutum RH2FE3 genes strongly correlated with cotton fiber development. Additionally, most of the identified genes were up-regulated in response to brassinolide, gibberellic acid, indole-3-acetic acid, salicylic acid and abiotic stresses. Thus, RH2FE3 genes play roles in cotton fiber development and respond to plant hormones and abiotic stresses.
Using F2 segregated populations constructed using a short-branch cotton variety, X1570, crossed with a long-branch genotype, Ekangmian-13, to analyze the short-fruiting branch gene and marker-assisted selection with single nucleotide polymorphism (SNPs) linked to its traits, ZHANG Youchang et al. identified a locus, SNP_GH1570, which is verified 100% co-segregated with short fruiting branch trait. The SNP_GH1570 locus could be used for molecular-assisted selection to improve cotton architecture and help in cotton breeding and cultivation.
The planting of transgenic Bacillus thuringiensis (Bt) cotton is a major approach to control cotton bollworm. Lü Limin et al. analyzed the effects of first-generation transgenic Bt cotton on the control of cotton bollworm in North China by investigating several parameters, including the number of cotton bollworms, the damage they inflicted to different cotton organs and the Bt protein content, in mainly cultivated cotton varieties from 2008 to 2015. Although Bt cotton varieties have been planted for more than 20 years in North China, almost all Bt varieties are still capable of controlling cotton bollworm effectively in North China.
In a review, Designations for individual genomes and chromosomes in Gossypium, Wang Kunbo et al. have provided a summary of the relationships and diversity among species of the Gossypium genus, as well as the designations for individual genomes and chromosomes in Gossypium. The genus was divided into eight diploid genomic groups (A through G, and K), as well as one allopolyploid clade (AD genome), formed from mergers and chromosomal doubling in the A and D genomic ancestors millions years ago. This cytogenetic and genomic nomenclature will facilitate comparative genomic studies, basic taxonomic exploration, breeding and germplasm introgression.