Genetic divergence in a meta-population of the Hourani durum wheat landrace. (3457)
Authors:
A.A. Jaradat* - NCSC REsearch Lab, ARS, USDA
Abstract:
The Hourani durum wheat landrace was cultivated for millennia in the Houran plateau of northern Jordan and southern Syria. Recently however, it became highly fragmented due to the introduction of HYVs. Its genetic divergence was assessed in 289 populations from 10 villages in 4 ecogeographical (EG) regions in both
countries. Ten agronomic (QNT) and 10 qualitative (QLT) traits in addition to polymorphism at 2 high-molecular-weight (HMW) glutenin loci were analyzed.
Polymorphism in QNTs was apportioned among populations (13.5%), among villages (56.4%), among EG regions (21.0%) and among countries (9.1%). The respective values for QLTs were 8.3, 20.7, 47.9 and 23.1%. Population
differentiation at the HMW glutenin loci showed a few significant differences among and within countries. Geographical distances among villages were significantly correlated with QNT (r=0.59) and QLT (r=0.43) ones; genetic
distances of the last two, however, were highly correlated (r=0.9; p=0.00). Based on QNTs, only 20% of the populations had all 10 principal components (CPCs) in common; almost half (53%) shared 6 to 8, whereas the remaining 27% shared zero to 3 CPCs. Average correct classification of germplasm by country (82%), EG region (70%) village (51%) and population (35.7%), based on the discriminant power of agronomic traits, confirms the existence of a highly divergent germplasm in this landrace.
Speaker Information: Abdullah Jaradat, NCSC REsearch Lab, ARS, USDA, 803 Iowa Avenue, Morris, MN 56267; Phone: 320-589-3411; E-mail:
Session Information: Tuesday, November 2, 2004, 8:00 AM-11:45 AM Presentation Start: 8:40 AM
Keywords: Landrace; Diversity; metapopulation; wheat
