Species Diversity in Wheat Landrace Populations from two Regions of Ethiopia |
| |
| Authors: | Firdissa Eticha Getachew Belay Endashaw Bekele |
| |
| Institution: | (1) Bako Agricultural Research Center, P.O. Box 3, Bako, Ethiopia;(2) Ethiopian Agricultural Research Organization, Debre Zeit Center, P.O. Box 32, Debre Zeit, Ethiopia;(3) Department of Biology, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia |
| |
| Abstract: | Wheat (Triticum spp.) landrace populations in Ethiopia are mostly species mixtures. However, no quantitative data is available with regard
to their species components. We studied here 32 wheat landrace populations originating from two regions (Bale and Wello).
A total of 2559 individual plants, 45–110 plants representing each population, were classified into their species components.
Five tetraploid (2n = 4x = 28) and one hexaploid (2n = 6x = 42) wheat species were found in mixtures of varying proportions.
These included the tetraploids Triticum durum Desf., Triticum turgidum L., Triticum aethiopicum Jakubz., Triticum polonicum L., Triticum dicoccon Schrank and the hexaploid Triticum aestivum L. Also found, however in a rare frequency, in two populations from Wollo was T. durum Desf. convar. durocompactoides Flaksb. (Triticum pyramidale Percival), which is a very dense spiked durum. Discriminant analysis using seven qualitative traits revealed 91.5% correct
classification of the wheat species, beak awn and awn length with the most significant importance. Single species were found
in eight of the populations; six were for T. durum and two for T. aethiopicum. Two to three species-combinations were the most frequent; a maximum of four species was recorded in one population. The
highest diversity index (H′) observed was 0.44. T. durum was the most predominant species. The hexaploid T. aestivum was found in nine of the Wollo populations and, in one population, its frequency reached up to 35.5%. On altitudinal basis,
no clear trend of clinal variation was observed both from the frequency distributions and H′ estimates. The results confirmed that Ethiopian wheats, despite the morphological overlaps, could be classified into their
species components with high degree of certainty. For the future, therefore, genetic diversity estimations should be dissolved
into their species components for more expeditious utilization and conservation of this important genetic resource. |
| |
| Keywords: | Ethiopian wheats Landrace Triticum spp Wheat taxonomy |
| 本文献已被 SpringerLink 等数据库收录！ |
|
