Histochemical studies on the lesions of rice blast caused by Piricularia oryzae CAV.

Toyoda, Sakae; Suzuki, Naoji

doi:10.3186/jjphytopath.22.173

Cited by 6 publications

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“…However, grain yield of the artificially defoliated plants was greater than that of diseased rice plants, indicating that leaf blast influenced the host plant more than just through a loss in leaf area. This conclusion is supported by Toyoda and Suzuki ( 1957), who observed an increased respiration in the surrounding green tissue of blast lesions. Moreover, Bastiaans ( 1991) measured that leaf blast reduced photosynthetic rate of the remaining green part of infected leaves.…”

Section: Introductionsupporting

confidence: 54%

Effects of leaf blast on photosynthesis of rice 2. Canopy photosynthesis

Bastiaans

Kropff

1993

Netherlands Journal of Plant Pathology

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The effect of Pyricu/aria ory:ae, the causal organism of leaf blast in rice, on photosynthetic rate of a rice crop was detennined with mobile equipment in the field. Canopy C0 2 exchange rate (CER) was significantly reduced in plots inoculated with P. oryzae. The experimentally obtained data were used to evaluate the perforn1ance of a model for the effects of leaf blast on canopy photosynthesis. The model comprised photosynthesis and respiration routines of a mechanistic crop growth model, extended with submodels for effects of leaf blast on both processes. Canopy photosynthesis and the effect of leaf blast on CER were accurately simulated with the model.Analysis showed that the reduction in canopy photosynthesis was mainly due to an adverse effect of lesions on leaf photosynthetic rate and to shading by dead leaf area resulting from disease induced senescence. A sensitivity analysis demonstrated the importance of the vertical distribution of the disease in the canopy. This implies that disease monitoring for crop loss assessment should consider vertical disease distribution.

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Section: Introductionsupporting

confidence: 54%

Effects of leaf blast on photosynthesis of rice 2. Canopy photosynthesis

Bastiaans

Kropff

1993

Netherlands Journal of Plant Pathology

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“…Detailed physiological research is required if a better insight in the mechanisms responsible for the reduction in leaf photosynthetic rate is desired. Toyoda and Suzuki ( 1957) observed an increase in the respiration of rice leaves after infection with P. oryzae. The present observations confirm this finding.…”

Section: Discussionmentioning

confidence: 87%

“…After infection, the physiology of rice leaves is affected. Toyoda and Suzuki ( 1957) have observed an increased respiration in the green tissue surrounding blast lesions. This increase was connected with a shift from the glycolytic to the pentose phosphate pathway, a phenomenon generally observed in plants infected by biotrofic pathogens (Shaw and Samborski, 1957;Smedegaard-Petersen, 1984).…”

Section: Introductionmentioning

confidence: 92%

Effects of leaf blast on photosynthesis of rice. 1. Leaf photosynthesis

Bastiaans

1993

Netherlands Journal of Plant Pathology

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The effect of Pyricu/aria oryzae, the causal organism of leaf blast in rice, on photosynthesis characteristics of rice leaves was measured in two greenhouse experiments. Leaf blast reduced photosynthesis not only through a reduction in green leaf area, but also through an effect on photosynthesis of green leaf tissu~ surrounding the lesions. The assimilation rate at light saturation (Pnu) was more affected than the initial light use efficiency (E). Dark respiration (Rd) increased as a result of infection. The experimental data were used to derive relations between leaf blast severity and pmax' E and Rd.

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“…However, another explanation for the observed correlation would be increased respiration of infected plants, reducing tissue C content. Rice leaves infected with the blast pathogen can show enhanced respiration (Toyoda & Suzuki, 1957). This increase can be attributed to the combination of fungal respiration and an increased respiration of the host.…”

Section: Discussionmentioning

confidence: 99%

Loci controlling partial resistance to rice blast do not show marked QTL × environment interaction when plant nitrogen status alters disease severity

2005

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Summary• Plant disease susceptibility is often increased by nitrogen (N) application. Therefore, it is important to know if resistance loci are effective in different plant N environments.• One-hundred lines of the Bala × Azucena rice ( Oryza sativa ) mapping population were grown in two N treatments and tested for partial resistance to blast ( Magnaporthe grisea ) isolate CD100. Disease severity (DS), the number and size of lesions and plant N and C concentrations were measured and the results subject to quantitative trait loci (QTL) and QTL × environment analysis.• There was a 66% higher plant N concentration in the high N treatment and DS increased significantly, mostly as a result of increased numbers of lesions. Nine regions contained QTL for disease traits but only one showed evidence of statistically significant QTL × treatment interaction. This was a large effect quantitative trait locus at marker R1933 on chromosome 12 which was less effective at high N.• Apparently, blast disease is increased by higher plant N, but the efficacy of partial resistance genes is not greatly affected by N application.

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Histochemical studies on the lesions of rice blast caused by Piricularia oryzae CAV.

Cited by 6 publications

References 0 publications

Effects of leaf blast on photosynthesis of rice 2. Canopy photosynthesis

Effects of leaf blast on photosynthesis of rice 2. Canopy photosynthesis

Effects of leaf blast on photosynthesis of rice. 1. Leaf photosynthesis

Loci controlling partial resistance to rice blast do not show marked QTL × environment interaction when plant nitrogen status alters disease severity

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