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Prediction of hybrid performance based on the genetic distance of parental lines in two-line rice ( Oryza sativa L.) hybrids

Prediction of hybrid performance based on the genetic distance of parental lines in two-line rice ( Oryza sativa L.) hybrids,10.1007/s12892-010-0111-y

Prediction of hybrid performance based on the genetic distance of parental lines in two-line rice ( Oryza sativa L.) hybrids  
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Vikas Kumar Singh, Priti Upadhyay, Pallavi Sinha, Ashish Kumar Mall, Ranjith K. Ellur, Atul Singh, Sanjay K. Jaiswal, Sunil Biradar, S. Ramakrishna, R. M. Sundaram, Ilyas Ahmed, B. C. Viraktamathhttp://academic.research.microsoft.com/io.ashx?type=5&id=47908920&selfId1=0&selfId2=0&maxNumber=12&query=
A total of six TGMS (thermosensitive genic male sterile lines) and nine pollinator lines were subjected to molecular characterization using 48 genome-wide SSR (simple sequence repeat) markers. Cluster analysis revealed clear differentiation among the TGMS lines according to their source of origin. The SSR-based genetic distance between the hybrids of the parental lines ranged from 0.36 to 0.79 suggesting a high degree of genetic divergence. Among a set of 54 hybrids generated using parental lines, 32 showed better parent heterosis (+21.7%) while 19 showed mid-parent heterosis (+15.0%). For the trait yield per plant genetic distance (GD) was negatively correlated with F1 performance (r = −0.202), mid-parent heterosis (r = −0.325*; P r = −0.261), while it was positively correlated with specific combining ability (r = 0.042). Based on the grouped genetic distance (GGD), the hybrid combinations were divided into four groups. The GGD showed linear correlation with hybrid performance within the group (GGD = 40–50: r = −0.07; GGD = 70–80: r = 0.32). This information can be utilized in the development of higher yielding, two-line rice hybrids through selection of intermediately diverse parental lines using GGD.
Journal: Journal of Crop Science and Biotechnology , vol. 14, no. 1, pp. 1-10, 2011
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