Quantitative inheritance of resistance to Septoria tritici blotch in durum wheat in Tunisia
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Citation
Samia Berraies, Karim Ammar, Mohamed Gharbi, Amor Yahyaoui, Salah Rezgui. (29/3/2014). Quantitative inheritance of resistance to Septoria tritici blotch in durum wheat in Tunisia. Chilean Journal of Agricultural Research, 74 (1), pp. 35-40.
Abstract
Septoria tritici blotch, causal agent Mycosphaerella graminicola (Fuckel) J. Schröt. (anamorph: Zymoseptoria tritici Desm.),
is the major foliar disease of wheat (Triticum aestivum L.) in Tunisia causing frequent epidemics on T. turgidum 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.
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