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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 74, No. 1, 2014, pp. 35-40
Bioline Code: cj14006
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 74, No. 1, 2014, pp. 35-40

 en Quantitative inheritance of resistance to Septoria tritici check for this species in other resources blotch in durum wheat in Tunisia
Berraies, Samia; Ammar, Karim; Salah Gharbi, Mohamed; Yahyaoui, Amor & Rezgui, Salah

Abstract

Septoria tritici check for this species in other resources blotch, causal agent Mycosphaerella graminicola check for this species in other resources (Fuckel) J. Schröt. (anamorph: Zymoseptoria tritici check for this species in other resources Desm.), is the major foliar disease of wheat ( Triticum aestivum check for this species in other resources L.) in Tunisia causing frequent epidemics on T. turgidum check for this species in other resources L. var. durum (Desf.) Bowden, and important yield and grain quality losses. To determine the inheritance of resistance to septoria, a cross was made using resistant (‘Salim’) and susceptible (‘Karim’) cultivars. Parents, and the 149 derived recombinant lines, were tested for resistance to septoria under field conditions during the 2009 and 2010 crop seasons. The inheritance of resistance to septoria was quantitative where a continuous and normal distribution (W = 0.93) was shown among segregate progenies. During 2009 and 2010 crop seasons, the mean disease severities of recombinant inbred lines (RILs) ranged from 29.1% to 41.8%, respectively, and 53% of RILs were associated with lower disease severity than the mid-parent value. The severity was significantly affected by Genotype × Year interaction (p < 0.01). Broad sense heritability was 0.55 suggesting a quantitative inheritance of resistance to M. graminicola. These results would imply that genetic resistance to STB could be attributed to additive gene effects. Thus, using identified sources of tolerance to STB in a breeding program would enhance the development of cultivars that are adapted to the prevailing isolates in field conditions.

Keywords
Inheritance; quantitative resistance; recombinant inbred line population; Triticum durum; Zymoseptoria tritici

 
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