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Genetic Structure Analysis of a Collection of Tunisian Durum Wheat Germplasm.
Thursday, 2019/07/25 | 06:45:52

Slim APiarulli LChennaoui Kourda HRouaissi MRobbana CChaabane RPignone DMontemurro CMangini G.

Int J Mol Sci. 2019 Jul 9;20(13). pii: E3362. doi: 10.3390/ijms20133362.

GERMPLASM CONSERVATION

Abstract

The Tunisian durum wheat germplasm includes modern cultivars and traditional varieties that are still cultivated in areas where elite cultivars or intensive cultivation systems are not suitable. Within the frame of a collection program of the National Gene Bank of Tunisia (NGBT), durum wheat germplasm was collected from different Tunisian agro-ecological zones. The collected samples were studied using simple sequence repeats (SSRs) markers to explore the genetic diversity and evaluate the genetic structure in Tunisian germplasm. The results demonstrated significant diversity in the Tunisian durum wheat germplasm, with clear differentiation between traditional varieties and modern cultivars. The population structure analysis allowed the identification of five subpopulations, two of which appear to be more strongly represented in germplasm collected in central and southern Tunisia, where environmental conditions at critical development phases of the plant are harsher. Moreover these subpopulations are underrepresented in modern varieties, suggesting that traits of adaptation useful for breeding more resilient varieties might be present in central and southern germplasm. Moreover, our results will support, the activity of in situ on farm conservation of Tunisian durum wheat germplasm started by the National Gene Bank of Tunisia along with the ex situ approach.

 

See https://www.ncbi.nlm.nih.gov/pubmed/31323925

Figure 2: Dendrogram of durum wheat collection resulting from the neighbor-joining cluster analysis based on the dissimilarity matrix obtained from SSR allelic data. The colors blue and red were used to distinguish the two main clusters.

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