Journal
PLANT BREEDING
Volume 128, Issue 1, Pages 54-62Publisher
WILEY
DOI: 10.1111/j.1439-0523.2008.01529.x
Keywords
Zea mays; genetic linkage map; simple sequence repeat; stay-green trait; quantitative trait locus
Funding
- National '973' Program [2006CB101700]
- Shanghai Municipal Scientific & Technological Commission [06DZ19101]
- Shandong Key Lab of Crop Biology
- Shanghai Jiaotong University
- Shanghai Academy of Agricultural Science
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A maize genetic linkage map derived from 115 simple sequence repeat (SSR) markers was constructed from an F-2 population. The F-2 was generated from a cross between a stay-green inbred line (Q319) and a normal inbred line (Mo17). The map resolved 10 linkage groups and spanned 1431.0 cM in length with an average genetic distance of 12.44 cM between two neighbouring loci. A total of 14 quantitative trait loci (QTL) were detected for stay-green traits at different postflowering time intervals and identified by composite interval mapping. The respective QTL contribution to phenotypic variance ranged from 5.40% to 11.49%, with trait synergistic action from Q319. Moreover, maize stay-green traits were closely correlated to grain yield. Additional QTL analyses indicated that multiple intervals of stay-green QTL overlapped with yield QTL.
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