Global Advanced Research Journal of Agricultural Science (GARJAS) ISSN: 2315-5094
June 2017 Vol. 6(6): pp. 141-150
Copyright © 2017 Global Advanced Research Journals

 

Full Length Research Paper

Evaluation of forage biomass and seed yield among alfalfa progenies bred for adaptation to Tunisian outside oases conditions

Tlahig Samir1,2(*), Ben Khaled Abdennaceur1,2and Loumerem Mohamed1

 

1Dryland and oases cropping Laboratory- Arid Land Institute of Médenine - Tunisia

2National Agronomic Institute of Tunis, University of Carthage - Tunisia

Email: samirtlahig@gmail.com

Accepted 07 June, 2017

 

Abstract

A breeding program focusing on the preservation and the improvement of local alfalfa germplasm ‘Gabssia’ collected from different oases of southern Tunisia was undertaken since 2004. Exotic genotypes (Sardi10, Ameristand801S, ABT805 and Siciliano Ecotipo) were used to improve local landraces considering their excellent response to the cropping conditions in the oases of southern Tunisia. In this trial, twelve superior alfalfa polycross progenies were evaluated on basis of polycross progeny performance. The purpose of this work was (i) to evaluate progenies’ forage yield variability among different seasons of a single cropping year and (ii) to assess their seed yield components and shoots parameters during the last cutting. Obtained results showed a noticeable genetic diversity in almost of assessed traits. Significant differences on fresh and dry yields under progeny and season factors were recorded. Progeny has highly significant effect (P<0.05) on variation of all shoots traits expect fresh Leaf/stem ratio. For seed yield components, highly significant differences were obtained among progenies (P<0.01) expect 1000 seeds weights. Multivariate cluster analysis and ACP bi-plot showed four groups of progenies. Superior progenies belong to the first group (progenies of local genotype ‘Gabssia’ L4, L23 and L39 having highest averages of seed yield components) and the second group (progenies of the genotype ‘Ameristand801S’ A73, A17 and A56 characterized by the highest averages of forage yield and shoots parameters). Based on these progenies performances, the original clones are selected from superior plant material to establish a synthetic variety well adapted to the arid conditions outside oasis.

Keywords: alfalfa, forage, breeding, seed-yield, arid conditions.

 


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