Quantitative trait loci for seedling vigor in rice under field conditions

2007 ◽  
Vol 100 (2-3) ◽  
pp. 294-301 ◽  
Author(s):  
Liang Zhou ◽  
Jin-Kai Wang ◽  
Qiong Yi ◽  
Yi-Zhong Wang ◽  
Ying-Guo Zhu ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Field Conditions ◽  
Seedling Vigor ◽  
Trait Loci

Mapping of quantitative trait loci controlling seedling vigor in rice (Oryza sativa L.) under submergence

Euphytica ◽  
2012 ◽  
Vol 192 (1) ◽  
pp. 63-75 ◽  
Author(s):  
O. E. Manangkil ◽  
H. T. T. Vu ◽  
N. Mori ◽  
S. Yoshida ◽  
C. Nakamura
Keyword(s):  
Oryza Sativa ◽  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Oryza Sativa L ◽  
Seedling Vigor ◽  
Trait Loci

Molecular mapping of quantitative trait loci in japonica rice

Genome ◽  
1996 ◽  
Vol 39 (2) ◽  
pp. 395-403 ◽  
Author(s):  
Edilberto D. Redoña ◽  
David J. Mackill
Keyword(s):  
Oryza Sativa ◽  
Quantitative Trait Loci ◽  
Qtl Mapping ◽  
Phenotypic Variation ◽  
Quantitative Trait ◽  
Rflp Markers ◽  
Seedling Vigor ◽  
Trait Loci ◽  
Rice Chromosomes ◽  
Molecular Maps

Rice (Oryza sativa L.) molecular maps have previously been constructed using interspecific crosses or crosses between the two major subspecies: indica and japonica. For japonica breeding programs, however, it would be more suitable to use intrasubspecific crosses. A linkage map of 129 random amplified polymorphic DNA (RAPD) and 18 restriction fragment length polymorphism (RFLP) markers was developed using 118 F2 plants derived from a cross between two japonica cultivars with high and low seedling vigor, Italica Livorno (IL) and Labelle (LBL), respectively. The map spanned 980.5 cM (Kosambi function) with markers on all 12 rice chromosomes and an average distance of 7.6 cM between markers. Codominant (RFLP) and coupling phase linkages (among RAPDs) accounted for 79% of total map length and 71% of all intervals. This map contained a greater percentage of markers on chromosome 10, the least marked of the 12 rice chromosomes, than other rice molecular maps, but had relatively fewer markers on chromosomes 1 and 2. We used this map to detect quantitative trait loci (QTL) for four seedling vigor related traits scored on 113 F3 families in a growth chamber slantboard test at 18 °C. Two coleoptile, five root, and five mesocotyl length QTLs, each accounting for 9–50% of the phenotypic variation, were identified by interval analysis. Single-point analysis confirmed interval mapping results and detected additional markers significantly influencing each trait. About two-thirds of alleles positive for the putative QTLs were from the high-vigor parent, IL. One RAPD marker (OPAD13720) was associated with a IL allele that accounted for 18.5% of the phenotypic variation for shoot length, the most important determinant of seedling vigor in water-seeded rice. Results indicate that RAPDs are useful for map development and QTL mapping in rice populations with narrow genetic base, such as those derived from crosses among japonica cultivars. Other potential uses of the map are discussed. Key words : QTL mapping, RAPD, RFLP, seedling vigor, japonica, Oryza sativa.

Identification of Quantitative Trait Loci for Cold Response of Seedling Vigor Traits in Rice

2007 ◽  
Vol 34 (3) ◽  
pp. 239-246 ◽  
Author(s):  
Longzhi Han ◽  
Yongli Qiao ◽  
Sanyuan Zhang ◽  
Yuanyuan Zhang ◽  
Guilan Cao ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Seedling Vigor ◽  
Cold Response ◽  
Trait Loci

scholarly journals Genetic Analysis and Molecular Mapping of Quantitative Trait Loci in Common Bean Against Pythium ultimum

2010 ◽  
Vol 100 (12) ◽  
pp. 1315-1320 ◽  
Author(s):  
Ana Campa ◽  
Elena Pérez-Vega ◽  
Aida Pascual ◽  
Juan José Ferreira
Keyword(s):  
Quantitative Trait Loci ◽  
Common Bean ◽  
Seed Coat ◽  
Quantitative Trait ◽  
Molecular Mapping ◽  
Recombinant Inbred Lines ◽  
Pythium Ultimum ◽  
Seedling Vigor ◽  
Emergence Rate ◽  
Trait Loci

Pythium ultimum is a soil pathogen that can cause seed decay and damage to roots in common bean. In this study, the response of a set of 40 common bean genotypes to P. ultimum and inheritance of the resistance in the 92 F7 recombinant inbred lines (RIL) developed from a cross between Xana and Cornell 49242 was investigated by using emergence rate and seedling vigor. Emergence of the 40 genotypes showed a significant association between white seed coat and response to this pathogen. Among these, 11 common bean genotypes, all with colored seeds, exhibited a high percentage of emergence and seedling vigor not significantly different (P > 0.05) to noninoculated plants. Response of the RIL population revealed both qualitative and quantitative modes of inheritance. A major gene (Py-1) controlling the emergence rate was mapped in the region of the gene P, a basic color gene involved in control of seed coat color, located on LG 7. Using the RIL subpopulation with colored seeds, a significant quantitative trait loci (QTL) associated with the emergence rate (ER3XC) and another with seedling vigor (SV6XC) were identified on the LG 3 and 6, respectively. QTL SV6XC was mapped in the region of the gene V, another gene involved the genetic control of color. QTLs associated with seed traits were mapped in the same relative position as regions involved in responses to P. ultimum suggesting the possible implication of avoidance mechanisms in the response to this pathogen.

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