Search

In this study , 48 SSR markers were used to assess the genetic variation of 63 peanut cultivars. The results showed that total 251 polymorphic alleles were detected , and the number of polymorphic fragments per marker ranged from 2 to 13 with an average of 5. 23. The genetic diversity index ranged from 0. 508 to 2. 243 with an average of 1.272. Polymorphism information content (PIC) ranged from 0. 252 to 0. 873 with an average of 0. 647 per primer pairs. Genetic similarity coefficients (GS) ranged from 0.657 to 0 . 9 6 0 , GS were lower among different botanical types , and genetic relationship was more distant among different origins. Cluster analysis was performed with the GS and the UPGMA method. 63 cultivars were divided into 4 groups at the threshold of 0. 74. The result of clustering analysis supported the conventional classification. [ABSTRACT FROM AUTHOR]

The quantitative trait loci (QTLs) for 21 traits of agronomy importance on ten substituted chromosomal segments were identified using single segment substitution lines (SSSLs) in rice, which were developed by the use of Taichung 65 as a recipient and zhai-ye-qing and dee-geo-woo-gen as donors respectively. Total length of the substituted segments in the SSSLs was 230.00 cM, which was 12.62% of rice genome. T-test was used to detect QTLs in the condition that the difference in phenotypes between a SSSL and the recipient parent (Taichung 65) was significant at the 0.1% level (P< or = 0.001). A total of 57 QTLs for 17 traits had been detected on the ten substituted segments, which were on chromosomes 1, 3, 5, 7, 8, 10 and 12 respectively. The additive effect percentages of the QTLs ranged from 1.10% to 89.73%. Among of 57 QTLs, fifteen QTLs had the additive effect percentage over 10%, thirty QTLs varied from 3% to 10% and other twelve QTLs were below 3%.