Inheritance of major genes for rice blast resistance in some Egyptian varieties [electronic resource].

Includes references.

Japanese differential varieties, known to contain specific blast resistant genes, were used in crosses with Egyptian varieties to understand the inheritance of major genes for rice blast resistance. Three types of experimental crosses were conducted: (resistant x resistant); (resistant x susceptible) and (susceptible x susceptible). Genetic analysis of their F1 and F2 populations showed that the five-resistant varieties namely; Toride 1, Shin 2, Fukunishiki, Giza 177, and Sakha 103 contain either one or two different leaf blast resistant gene(s). The varieties Toride 1 and Shin 2 contain two resistance genes (AABB), while the other three varieties contained one resistance gene, which varied from. Fukunishiki (BB) to Giza 177 and Sakha 103 (AA). Correlation coefficients (CCs) were estimated among the nine rice varieties for eleven agronomic characters with blast infection. Positive correlations of three vegetative characters; heading date, plant height and flag leaf area with blast infection were observed. Thousandgrain weight had highly negative CC with blast infection while unfilled grains per panicle expressed positive correlation.

Summary in Arabic.

1