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Quantifying rice-leaf blast BI genetic relationship via the receptivity factor

International Rice Research Newsletter 17(2): 9

Quantifying rice-leaf blast BI genetic relationship via the receptivity factor

A study of the receptivity factor (RF; number of lesions produced on the plant divided by the number of Magnaporthe grisea spores deposited on the plant) in the susceptible lowland rice varieties IR50 and IR72, the moderately resistant upland variety UPLRi5 and the resistant Kinandang Patong showed that RF values were highest in IR50.

Accession: 002200518

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Related references

Tokunaga, Y.; Kato, H.; Koshimizu, Y., 1965: Studies on the relationship between metabolism of Rice plant and its resistance to blast disease. 2. Effect of the phosphorus content in leaf blades during maturity on disease proneness to leaf blast. Plants of the susceptible var. Norin No. 41 were grown at 8 levels of phosphoric acid from 0 to 150 p.p.m. Susceptibility to blast (Pyricularia oryzae) increased with an increase in available P, and was greater in young mature tissue than in old....

Anonymous, 1994: Study on the simulation and forecast model of epidemic of rice leaf blast in Jilin Province. I. The establishment of models of subsystems of rice leaf blast. Quantitative research on some main subsystems of epidemics of rice leaf blast [Magnaporthe grisea] were studied. A submodel based on the index of the promotion of disease by temp., humidity, rain, potentiality of incubation and symptom appearance...

Anonymous, 1941: Studies on the nature of rice blast resistance I The effect of silicic acid on the resistance II The effect of combined use of silicic acid and nitrogenous manure on the toughness of the leaf blade of rice and its resistance to rice blast III Relation between rice blast resistance and some physical and chemical properties of the different portions of the leaf blade of rice

Bastiaans, L., 1991: Quantifying the effect of rice leaf blast on leaf photosynthesis, crop growth, and final yield using an ecophysiological model of crop growth. At both high and low light intensities, infection by Pyricularia oryzae [Magnaporthe grisea] reduced photosynthesis by reduction in green leaf area and also through an effect on photosynthesis in the remaining green leaf tissue. Whole-leaf dark re...

Kiyosawa, S., 1966: Studies on inheritance of resistance of rice varieties to blast. 2. Genetic relationship between the blast resistance and other characters in the rice varieties, Reishiko and Sekiyama 2. Linkage relationships were studied in the F2and F3 populations of the cross Reishiko x Sekiyama 2. There was no linkage between the two dominant genes for resistance, between genes for colour of palea and lemma or between two recessive genes for y...

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Yoshi, H., 1941: Studies on the nature of rice blast resistance. II. The effect of combined use of silicic acid and nitrogenous manure to the toughness of the leaf blade of rice and its resistance to rice blast. This part of the investigation showed that the determination of the toughness of the leaf blade-gave a good indication of the degree of blast resistance, provided the plant is grown under unfavourable conditions such as excess of nitrogen manure.

Harasawa, R., 2001: Predicting the onset of general epidemics of rice leaf blast based on development of leaf blast in seedling mats left in paddy fields. Rice leaf blast, caused by Pyricularia grisea, usually starts in a region with a general leaf blast epidemic. Most (if not all) inoculum sources are believed to come from infected seedlings which are left in mats in the fields and used to fill vac...

Huang, Y.T.; Yu, C.M.; Tsai, W.H.; Tai, L.H.; Chan, Y.F.; Huang, T.Y., 1978: Epidemiology of rice blast I. Studies on the mathematical models for the curve of disease increase of rice leaf blast. Ten sets of data were used to fit 16 mathematical models for disease progress curves of Pyricularia oryzae. The results are discussed.

Ishiguro, K., 2001: Improving management strategies for rice blast disease using a simulation model of rice leaf blast epidemics. The objectives of this study, conducted in Iwate, Japan [date not given], were the quantitative validation of a simulation model for leaf blast [Magnaporthe grisea] epidemics of rice (BLASTL), the incorporation of the components of fungicide and N...