Effect of potash deficiency on hot susceptibility to cochliobolus sativus causing spot blotch on wheat
(2007) Wheat Production in Stressed Environments — p. 273-279 pp, published
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- Abstract
- Helminthosporium leaf blight is the most important disease of bread wheat in the Indo-Gangetic plains and is caused by Cochliobolus sativus and Pyrenophora tricirepentis. Late planting and unbalanced fertility increase disease severity. A study on two genotypes BL2217(moderately resistant) and Ciano 79 (susceptible) was conducted in a greenhouse under controlled-environment with 3 levels of potassium fertilisation. Treatments consisted of half-strength standard Hoagland solution pH7.0 as control , and two levels of potassium deficient solutions containing only 36.8% and 13.5% potassium of the standard half-strength solution. Plants were inoculated with a C. sativus virulent isolate from Nepal. Disease severity (% DLA) and chlorophyll content measured as SPAD value (SPAD-502, Minolta Co. Ltd., Japan) at 3,7,10,14,17 and 21 days after inoculation were evaluated in inoculated and control plants, respectively. To assess the interaction of the pathogen with host cells, microscopic analysis and histochemical assays for H2O2 detection were performed 24-h and 48-h after inoculation. Potassium deficiency significantly increased disease severity in both genotypes. A significant(P<0.01) negative linear correlation between AUDPC and chlorophyll content was observed for both genotypes. Microscopic analysis and histochemical assay for H2O2 detection showed that cell wall apposition formation and hypersensitive reaction were significantly reduced in BL 2217 under potassium deficiency , stressing the importance of the soil fertility as part of an integrated crop management of HLB.
- Affiliations
Cimmyt South Asia Office , Singha Durbar Plaza Marg. P.O. Box 5186, Kathmandu - Népal
Citations
Mercado Vergnes, D. (2007). Effect of potash deficiency on hot susceptibility to cochliobolus sativus causing spot blotch on wheat. In Buck, H.T. et al. (ed.), Wheat Production in Stressed Environments (p. p. 273-279 pp). Springer Verlag. https://hdl.handle.net/2078.5/64472