Effect on leaf photosynthetic rate by leaf blast for rice cultivars with different types and levels of resistance

Abstract

SummaryThe effect of an inoculation with Pyricularia oryzae (isolate P06-6) on net leaf photosynthetic rate of rice ( Oryza sativa) was studied with four cultivars. Measurements were taken on the sixth leaf of the main culm of plants in the early tillering stage. On cultivars C039, IR50 and IR64 a susceptible infection type developed, but a clear difference in relative infection efficiency of the cultivars was observed. The highest number of lesions developed on leaves of C039, whereas the lowest number was found on leaves of IR64. For all three cultivars the effect of a single lesion on the reduction in net leaf photosynthetic rate was found to be equal to a reduction in leaf area of three times the area occupied by the visible lesion. On IR68, a cultivar with complete resistance, brown specks of pinpoint size appeared without any effect on net leaf photosynthetic rate.

Role of Host‐plant Resistance and Disease Development Stage on Leaf Photosynthetic Competence of Soybean Rust Infected Leaves

“…Consistent with the results in the current study, Bastiaans and Roumen (1993) reported that the photosynthetic competence of rice (Oryza sativa L.) plants were similar among three rice cultivars with a wide range in relative infection effi ciency (proportion of sporulating lesions) of rice leaf blast (Pyricularia oryzae). The resistance gene from Hyuuga was eff ective in changing the lesion type, reducing disease severity, and eliminating sporulation in the RIL GO1-PR68.…”

Leaf gas exchange and chlorophyll a fluorescence of Eucalyptus urophylla in response to Puccinia psidii infection

“…When plants are attacked by pathogens, physiological and photosynthetic properties are often impaired (Guo et al 2005;Swiech et al 2001). A number of studies have shown that pathogen infection leads to a decrease in photosynthesis rates (Bastiaans 1991;Bastiaans and Roumen 1992;Berger et al 2007;Chou et al 2000;Domiciano et al 2009) and modifications of the photosynthetic apparatus (Lichtenthaler and Miehé 1997). These modifications can be due to negative regulation or damage to the photosynthetic apparatus.…”

Silicon enhances photochemical efficiency and adjusts mineral nutrient absorption in Magnaporthe oryzae infected rice plants

“…When plants were infected by pathogens, physiological and photosynthetic properties and growth of plants were negatively influenced (Chia and He 1999;Swiech et al 2001;Guo et al 2005). Most studies showed that pathogen infection led to a decrease in photosynthesis (Bastiaans 1991;Ogren and Evans 1992;Bastiaans and Roumen 1993;Chou et al 2000;Berger et al 2004) and modification or damage of the photosynthetic apparatus (Lichtenthaler and Miehé 1997) which might be the result of a down-regulation of photosynthesis or damage of the photosynthetic apparatus. Both of maximum/ potential quantum efficiency (F v /F m ) and the maximum primary yield (F v /F 0 ) of photochemistry of PS II are related to photosynthetic efficiency of plant leaves (Shangguan et al 2000).…”