Quantitative trait locus analysis of multiple agronomic traits in the model legume Lotus japonicus

Genome ◽  
2007 ◽  
Vol 50 (7) ◽  
pp. 627-637 ◽  
Author(s):  
Takahiro Gondo ◽  
Shusei Sato ◽  
Kenji Okumura ◽  
Satoshi Tabata ◽  
Ryo Akashi ◽  
...  
Keyword(s):  
Quantitative Trait Locus ◽  
Quantitative Trait ◽  
Agronomic Traits ◽  
Recombinant Inbred Lines ◽  
Lotus Japonicus ◽  
Seed Mass ◽  
Chromosome 2 ◽  
Seed Traits ◽  
Model Legume ◽  
Trait Locus

The first quantitative trait locus (QTL) analysis of multiple agronomic traits in the model legume Lotus japonicus was performed with a population of recombinant inbred lines derived from Miyakojima MG-20 × Gifu B-129. Thirteen agronomic traits were evaluated in 2004 and 2005: traits of vegetative parts (plant height, stem thickness, leaf length, leaf width, plant regrowth, plant shape, and stem color), flowering traits (flowering time and degree), and pod and seed traits (pod length, pod width, seeds per pod, and seed mass). A total of 40 QTLs were detected that explained 5%–69% of total variation. The QTL that explained the most variation was that for stem color, which was detected in the same region of chromosome 2 in both years. Some QTLs were colocated, especially those for pod and seed traits. Seed mass QTLs were located at 5 locations that mapped to the corresponding genomic positions of equivalent QTLs in soybean, pea, chickpea, and mung bean. This study provides fundamental information for breeding of agronomically important legume crops.

Quantitative trait locus mapping of the transpiration ratio related to preflowering drought tolerance in sorghum (Sorghum bicolor)

2014 ◽  
Vol 41 (11) ◽  
pp. 1049 ◽  
Author(s):  
Mohankumar H. Kapanigowda ◽  
William A. Payne ◽  
William L. Rooney ◽  
John E. Mullet ◽  
Maria Balota
Keyword(s):  
Sorghum Bicolor ◽  
Quantitative Trait ◽  
Agronomic Traits ◽  
Stomatal Density ◽  
Recombinant Inbred Lines ◽  
Vapour Pressure Deficit ◽  
Field Capacity ◽  
Co2 Assimilation ◽  
Mean Values ◽  
Trait Locus

To meet future food needs, grain production must increase despite reduced water availability, so waterproductivity must rise. One way to do this is to raise the ratio of biomass produced to water transpired, which is controlled by the ratio of CO2 assimilation (A) to transpiration (E) (i.e. the transpiration ratio, A : E divided by vapour pressure deficit) or anything affecting stomatal movement.. We describe the genetic variation and basis of A, E and A : E among 70 recombinant inbred lines (RILs) of sorghum (Sorghum bicolor (L.) Moench), using greenhouse experiments. Experiment 1 used 40% and 80% of field capacity (FC) as water regimes; Experiment 2 used 80% FC. Genotype had a significant effect on A, E and A : E. In Experiment 1, mean values for A : E were 1.2–4.4 mmol CO2 mol–1 H2O kPa–1 and 1.6–3.1 mmol CO2 mol–1 H2O kPa–1 under 40% and 80% FC, respectively. In Experiment 2, values were 5.6–9.8 mmol CO2 mol–1 H2O kPa–1. Pooled data for A : E and A : E VPD–1 from Experiment 1 indicate that A : E fell quickly at temperatures >32.3°C. A : E distributions were skewed. Mean heritabilities for A : E were 0.9 (40% FC) and 0.8 (80% FC). Three significant quantitative trait loci (QTLs) associated with A:E, two on SBI-09 and one on SBI-10, accounted for 17–21% of the phenotypic variation. Subsequent experiments identified 38 QTLs controlling variation in height, flowering, biomass, leaf area, greenness and stomatal density. Colocalisation of A : E QTLs with agronomic traits indicated that these QTLs can be used for improving sorghum performance through marker assisted selection (MAS) under preflowering drought stress.

A major quantitative trait locus determining serum leptin levels and fat mass is located on human chromosome 2

1997 ◽  
Vol 15 (3) ◽  
pp. 273-276 ◽  
Author(s):  
Anthony G. Comuzzie ◽  
James E. Hixson ◽  
Laura Almasy ◽  
Braxton D. Mitchell ◽  
Michael C. Mahaney ◽  
...  
Keyword(s):  
Quantitative Trait Locus ◽  
Human Chromosome ◽  
Fat Mass ◽  
Quantitative Trait ◽  
Major Quantitative Trait Locus ◽  
Chromosome 2 ◽  
Serum Leptin ◽  
Trait Locus

scholarly journals Recessive Resistance Governed by a Major Quantitative Trait Locus Restricts Clover Yellow Vein Virus in Mechanically but Not Graft-Inoculated Cultivated Soybeans

2019 ◽  
Vol 32 (8) ◽  
pp. 1026-1037 ◽  
Author(s):  
Junya Abe ◽  
Yongzhi Wang ◽  
Tetsuya Yamada ◽  
Masako Sato ◽  
Takuya Ono ◽  
...  
Keyword(s):  
Quantitative Trait Locus ◽  
Quantitative Trait ◽  
Major Quantitative Trait Locus ◽  
Recombinant Inbred Lines ◽  
Systemic Infection ◽  
Yellow Vein ◽  
Systemic Spread ◽  
Clover Yellow Vein Virus ◽  
Trait Locus ◽  
Cultivated Soybean

Clover yellow vein virus (ClYVV) infects and causes disease in legume plants. However, here, we found that ClYVV isolate No. 30 (ClYVV-No.30) inefficiently multiplied or spread via cell-to-cell movement in mechanically inoculated leaves of a dozen soybean (Glycine max) cultivars and resulted in failure to spread systemically. Soybean plants also had a similar resistance phenotype against additional ClYVV isolates. In contrast, all but one of 24 tested accessions of wild soybeans (G. soja) were susceptible to ClYVV-No.30. Graft inoculation of cultivated soybean TK780 with ClYVV-No.30–infected wild soybean B01167 scion resulted in systemic infection of the cultivated soybean rootstock. This suggests that, upon mechanical inoculation, the cultivated soybean inhibits ClYVV-No.30, at infection steps prior to the systemic spread of the virus, via vascular systems. Systemic infection of all F1 plants from crossing between TK780 and B01167 and of 68 of 76 F2 plants with ClYVV-No.30 indicated recessive inheritance of the resistance. Further genetic analysis using 64 recombinant inbred lines between TK780 and B01167 detected one major quantitative trait locus, designated d-cv, for the resistance that was positioned in the linkage group D1b (chromosome 2). The mapped region on soybean genome suggests that d-cv is not an allele of the known resistance genes against soybean mosaic virus.

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