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Suitability of drought tolerance indices for selecting alfalfa (Medicago sativa L.) genotypes under organic farming in Austria

Moghaddam, Ali; Vollmann, Johann; Wanek, Wolfgang; Ardakani, M. Reza; Raza, Amir; Pietsch, Gabriele and Friedel, Juergen K. (2012) Suitability of drought tolerance indices for selecting alfalfa (Medicago sativa L.) genotypes under organic farming in Austria. Crop Breeding Journal, 2 (2), pp. 79-89.

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Document available online at: http://cbjournal.spii.ir/browse.php?cur=1&sid=1&slc_lang=en


In eastern Austria, alfalfa is usually grown as a rainfed crop in crop rotations in organic farming systems, where year-to-year rainfall fluctuations cause different levels of drought stress. To identify the suitability of different alfalfa genotypes and drought tolerance indices, 18 contrasting alfalfa genotypes were evaluated under irrigated and rainfed conditions at the research station of the University of Natural Resources and Life Sciences (BOKU), Vienna, Austria, during 2006-08. The first study year (2006) was considered as the establishment year. Five drought tolerance selection indices were estimated based on shoot dry matter, total biomass yield and biological nitrogen fixation (BNF) data. The correlation between irrigated and rainfed performances increased (from r=-0.17 to 0.56) with decreasing stress intensity from the first to the second year. Genotypes Sitel, Plato ZS, Vlasta and NS-Banat were the best genotypes based on their performance under both conditions. Drought tolerance selection indices TOL and SSI showed high correlations (r = 0.32 to 0.81) only with rainfed performance, and SSI was the index that best identified genotypes with high yield potential under rainfed conditions. Indices STI and GMP were the ones that best identified genotypes with high performance under both conditions.

EPrint Type:Journal paper
Keywords:biological nitrogen fixation, Iranian ecotypes, shoot dry matter, stress intensity, total biomass yield
Agrovoc keywords:
Subjects:"Organics" in general
Crop husbandry
Research affiliation:Other countries
Austria > Univ. BOKU Wien
Austria > Univ. BOKU Wien > Sustainable Agr. Systems - IfÖL
Austria > University of Vienna
Deposited By: Ardakani, Professor M.Reza
ID Code:22510
Deposited On:18 Apr 2013 13:43
Last Modified:24 Apr 2013 09:12
Document Language:English
Refereed:Peer-reviewed and accepted

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