Quantitative Trait Loci Associated with Functional Stay-Green SNU-SG1 in Rice
Molecules and Cells, ISSN: 1016-8478, Vol: 24, Issue: 1, Page: 83-94
2007
- 76Citations
- 75Captures
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Article Description
During monocarpic senescence in higher plants, functional stay-green delays leaf yellowing, maintaining photosynthetic competence, whereas nonfunctional stay-green retains leaf greenness without sustaining photosynthetic activity. Thus, functional stay-green is considered a beneficial trait that can increase grain yield in cereal crops. A stay-green japonica rice ‘SNU-SG1’ had a good seedsetting rate and grain yield, indicating the presence of a functional stay-green genotype. SNU-SG1 was crossed with two regular cultivars to determine the inheritance mode and identify major QTLs conferring stay-green in SNU-SG1. For QTL analysis, linkage maps with 100 and 116 DNA marker loci were constructed using selective genotyping with F 2 and RIL (recombinant inbred line) populations, respectively. Molecular marker-based QTL analyses with both populations revealed that the functional stay-green phenotype of SNU-SG1 is regulated by several major QTLs accounting for a large portion of the genetic variation. Three main-effect QTLs located on chromosomes 7 and 9 were detected in both populations and a number of epistatic-effect QTLs were also found. The amount of variation explained by several digenic interactions was larger than that explained by main-effect QTLs. Two main-effect QTLs on chromosome 9 can be considered the target loci that most influence the functional staygreen in SNU-SG1. The functional stay-green QTLs may help develop low-input high-yielding rice cultivars by QTL-marker-assisted breeding with SNU-SG1.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S101684782310759X; http://dx.doi.org/10.1016/s1016-8478(23)10759-x; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=35048855476&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S101684782310759X; http://dx.doi.org/10.1016/s1016-8478%2823%2910759-x; https://dx.doi.org/10.1016/s1016-8478%2823%2910759-x
Elsevier BV
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