ISSN:
1439-0523
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Three F1 progenies and their families in the segregating generations (F3, F4, F5 and F6), obtained after crossing resistant × susceptible wheat genotypes were studied in the field to determine the genetics of resistance to spot blotch caused by Bipolaris sorokiniana. Spot blotch scores in the F1 generation showed absence of dominance. Individually threshed F2 plants were used to advance the generations. Progenies (200-250) of resistant genotypes Acc. No. 8226, Mon/Ald, Suzhoe#8 crossed with susceptible ‘Sonalika’ were evaluated in the F3, F4, F5 and F6 generations under induced epiphytotic conditions. Based on disease score distribution in individual progeny rows, F3 progenies were grouped into four classes: homozygous resistant, homozygous susceptible, segregating resistant and segregating susceptible. Resistance appeared to be under the control of three additive genes. The presence of three genes was also noted in the distribution of F4 and F5 lines. In the case of F6 progeny rows, both quantitative and qualitative models were used to estimate the number of segregating genes based on a 2-year trial. It appeared that resistance to spot blotch was controlled by the additive interaction of more than two genes, possibly only three.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1439-0523.2004.00954.x
