, Volume 66, Issue 1, pp 81–87

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

  • L. Bastiaans
  • E. C. Roumen

DOI: 10.1007/BF00023511

Cite this article as:
Bastiaans, L. & Roumen, E.C. Euphytica (1992) 66: 81. doi:10.1007/BF00023511


The 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 CO39, 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 CO39, 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.

Key words

leaf blast Oryza sativa photosynthesis Pyricularia oryzae rice tolerance 

Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • L. Bastiaans
    • 1
  • E. C. Roumen
    • 2
  1. 1.Department of Theoretical Production EcologyWageningen Agricultural UniversityWageningenThe Netherlands
  2. 2.Department of Plant BreedingWageningen Agricultural UniversityWageningenThe Netherlands

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