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GrainGenes Reference Report: CRI-30-159

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Reference	CRI-30-159
Title	Genetics of leaf blight resistance in durum wheat
Journal	Crop Improvement
Year	2003
Volume	30
Pages	159-163
Author	Sunil J Mahal GS Satvinder K Sarvjeet S
Abstract	The inheritance of leaf blight resistance in durum wheat (Triticum turgidum var. durum (T. durum)) was studied by crossing 2 resistant genotypes (PDW 239 and Dack/Kiwi//Oste/3/Chen84.1/4/Mexi75/5/Nigris 4) with 2 susceptible genotypes (PDW 272 and PDW 273). The parents, and F1, F2 and F3 generations from the 4 crosses were screened under artificial epiphytotic conditions in the greenhouse by spraying the spore suspension inoculum of a mixture of virulent races of Helminthosporium sativum (Cochliobolus sativus) and Alternaria triticina. The plants showing less than 35% of leaf area infected were considered resistant and those with greater leaf area infected were considered susceptible. The F1s of all the crosses showed susceptibility reaction, indicating dominance of susceptibility over resistance. The chi-square ( chi 2) analysis gave a good fit to ratio of 9 susceptible:7 resistant plants in the F2 generation of all the crosses, suggesting that susceptibility reaction is governed by 2 dominant genes with complementary effect. The results were further confirmed from the data of F3 progenies that segregated into 1:8:7 ratio, i.e. 1 completely susceptible, 8 segregating and 7 completely resistant progenies
Keyword	[ Hide all but 1 of 13 ] cross disease resistance dominance fungal diseases genotype hard wheat inheritance leaf area plant breeding plant diseases plant pathogenic fungi plant pathogens susceptibility

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