Hybrid parent lines from Mestiso 1 and 2 could withstand bacterial leaf attacks with the successful incorporation of resistance genes using gene pyramiding.
Gene pyramiding is the introduction of multiple target genes from different parental donors into a simple genotype.
This is the result of a research on gene pyramiding done by a team led by Dr. Dindo A. Tabanao, a plant breeder at the Philippine Rice Research Institute (PhilRice).
The varieties now contain two to three bacterial blight resistance genes providing better options for farmers in managing bacterial blight.
Mestizo 3 or NSIC Rct 116H that was released in 2002 has a maximum yield of 8.6 t/ha and matures in 106 days while Mestizo I or PSB RC72H, released in 1997, can yield up to 9.9 t/ha with 123 days of maturity.
However, study shows that susceptibility of hybrid rice to bacterial blight is one of the major constrains in the success of hybrid rice technology as it could cause 30 to 40% yield loss.
Symptoms include having water-soaked to yellowish stripes on leaf blades starting at leaf tips, which start to manifest at two to six weeks after seedling stage. Estrella Z. Gallardo PSciJourn MegaManila
Nice job
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