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Salt stress is a major limitation for crop production in saline soil. For investigating genetic mechanism of salt tolerance at germination and seedling stage, and improving salt tolerance of sorghum, 181 recombinant inbred lines derived from Shihong137 and L-Tian were used in this study. Quantitative trait loci (QTLs) for three traits at germination stage and nine traits at seedling stage were analyzed...
Organic acids play a primary role in defining grape flavor and wine organoleptic properties. China-originated grape species contain high level acid, which limits to a certain extent, the marketing of fruits and their processing products. The objective of this study is to compare the changes of four organic acids along with grape berry development in cultivars native to China and Europe as well as...
Maize (Zea mays L.) is one of few crops that can offer significant genetic gains with the utilization of genetic diversity. Genetically broad-based germplasm has the potential to contribute useful and unique alleles to U.S. Corn Belt breeding programs not present in current U.S. genome sequences (e.g. B73, NAM, etc.). Our objectives were to determine if unique tropical genetic materials have been...
Increasing crop yield is a major challenge in modern agriculture. Thus, the relationships between yield and its impact traits in cotton breeding need to be studied. A genetic model with additive, dominance, and their interaction effect with environment was used to analyze the two-year data of 20 parents and 100 F1 hybrids from a 10 × 10 diallel cross (North Carolina II design) in intraspecific upland...
The cytoplasmic male sterile (CMS) wheat (Triticum aestivum L.) line KTP116A developed at Northwest A&F University, Yangling, China, was sterile at temperatures below 18 °C and fertile at temperatures above 20 °C during Zadok’s growth stages 45–52. The possibility of a two-line system has a promising future for hybrid wheat production. The present study describes morphological differences in pollen...
Six faba bean gene-pools were cultivated to develop locally adapted genetic material for low-input (LI) systems that take advantage of the observed benefit of LI agriculture in pollinator density and diversity. Bee pollinators intensify selection on floral traits important in attraction and mechanical-fit but may also select for traits that increase seed set through outcrossing and aided selfing....
Epistasis, is the interaction between alleles from two or more loci determining complex traits, and thus plays an important role in the development of quantitative traits of crops. In mapping studies of inbreeding species epistasis is usually defined as the interactions between quantitative trait loci with significant additive gene effects. Indeed, in many studies, genes with small effects do not...
Despite efforts made, forage yield of smooth bromegrass has increased slowly over the last 50 years of breeding. It therefore seems necessary to investigate more on the genetic basis of agro-morphological traits in this cool-season, highly drought resistant grass. The present study was aimed at estimation of total genetic variance, narrow-sense heritability, general combining ability, phenotypic and...
Producing higher yields under organic conditions is generally hampered by weeds and lesser nutrient supply. In wheat certain adaptive traits like early season vigour, taller plants, and shorter life cycle have been reported to help plants compete with weeds and produce satisfactory yields. In this experiment we tested the hypothesis ‘that early flowering and maturity conferred by insensitive vernalization...
Common cutworm (CCW; Spodoptera litura Fabricius) is a major leaf-feeding pest in Asia. The focus of this study was to explore the genetic mechanism for resistance to CCW in terms of antibiosis and antixenosis through mapping QTL (Quantitative trait locus/loci) in soybean using two recombinant inbred line populations. Larva weight (LW) and pupa weight (PW) were evaluated as indicators for antibiosis...
Plant height is an important plant architecture trait that determines the canopy structure, photosynthetic capacity and lodging resistance of upland cotton populations. To understand the genetic basis of plant height for marker-assisted breeding, quantitative trait loci (QTL) analysis was conducted based on the genetic map of recombinant inbred lines (RILs) derived from the cross “CRI12 × J8891” (...
High prices of fish oil make linseed attractive for aquaculture and animal feed. To ensure a constant supply of linseed, the development of stable cultivars is of strategic importance. In this study, 35 linseed genotypes were evaluated in five Chilean environments (E) from 2009 to 2012. The additive main effect and multiplicative interaction analysis (AMMI), genotype (G) plus genotype by environment...
Genetic progress has brought about a dramatic increase in yield potential per se for almost all production areas around the world. The present study examines the relationship of wheat yield with year of release, yield components, harvest index (HI), biomass production, and plant height. We used aggregative data from 1945 to 2010 to calculate genetic gain in wheat yield across different zones in China...
Stripe rust (or yellow rust), caused by Puccinia striiformis f. sp. tritici, is one of the most destructive diseases of wheat worldwide. Growing resistant cultivars is the best approach to control the disease. To identify and map genes for stripe rust resistance in wheat cultivar ‘Wuhan 2', an F2 population was developed from a cross between the cultivar and susceptible cultivar Mingxian 169. The...
We investigated the molecular basis of an extremely late bolting, non-heading ‘Leafy Green Parental Line No. 2 (Tsukena No. 2)’, to obtain suitable DNA markers for breeding the late bolting trait in Chinese cabbage (Brassica rapa L. ssp. pekinensis). We found that Tsukena No. 2 contains a ~5 kbp large insertion near the 5′ end of the first intron of BrFLC2, BrFLC3 and BrFLC3′, which are homologs of...
The mature fruit skin of ‘Dangshansuli’ pear (Pyrus bretchnederi Rehd.) is yellow-green, but the fruit of the mutant, ‘Xiusu’, is russetted. To understand the mechanism of russet formation, the suppression subtractive hybridization libraries were used to screen for differentially expressed genes between the wild type pear and the mutant. Three hundred and twenty nine and 366 unigenes were obtained...
Molecular screening and genetic diversity of major rice blast resistance (R) genes were determined in 32 accessions of rice germplasm from North East and Eastern India with ten gene based single nucleotide polymorphisms and sequence tagged sites (STS) markers, namely z56592, zt56591, k39512, k3957, candidate gene marker, Pita3, YL155/YL87, YL183/YL87, Pb28, 195R-1 which showed close-set linkage to...
Quantitative trait locus (QTL) for grain size traits that include grain length (GL), grain width (GW), grain thickness (GT) as well as thousand grain weight (TGW) were identified using F2 population derived from a cross between a japonica cultivar Nongken58 and its large grain-sized mutant, ‘Dali’, which was selected in SP2 generation of plants from Nongken58 seeds exposed to cosmic radiation upon...
Introduced maize (Zea mays L.) germplasm can serve as sources of favorable alleles to enhance performance in new maize varieties and hybrids under drought stress conditions. In the present study, the combining abilities of 12 exotic maize inbred lines from CIMMYT and 12 adapted maize inbred lines from IITA were studied for grain yield and other traits under controlled drought stress. The inbred lines...
Stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst), is one of the most important diseases on wheat in China. To assess resistance in wheat cultivars and breeding lines in China, 330 leading cultivars and 164 advanced breeding lines were evaluated with stripe rust. In the greenhouse tests, seedlings of the entries were inoculated separately with several Pst pathotypes. In the field tests,...
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