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Resistance to Helminthosporium leaf blight and agronomic performance of spring wheat genotypes of diverse origins

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Abstract

Helminthosporium leaf blight (HLB), caused by a complex of Cochliobolus sativus (Ito & Kurib.) Drechsler ex Dastur and Pyrenophora tritici-repentis Died, is a serious disease of wheat (Triticum aestivum L.) in the warm lowlands of South Asia. Wheat cultivars grown in the area are either susceptible to HLB or possess low levels of resistance to it. A replicated field study was conducted in 1999 and 2000 at two sites in Nepal to determine the level of HLB resistance and other desirable traits in 60 wheat genotypes of diverse origin. The test genotypes were planted in main strips divided into two strips one of which was sprayed four times with Tilt™ (a.i. propiconazole) @ 125 g of a.i. ha−1. Four readings of HLB were recorded to calculate the area under the disease progress curve (AUDPC). Other traits under investigation included biomass yield (BY), grain yield (GY), 1000-kernel weight (TKW), harvest index (HI), days to heading (DH) and maturity (DM), plant height (PHT), and effective tiller number (ETN). Wheat genotypes differed significantly for all traits. Mean AUDPC values ranged from 45 to 1268. A few exotic genotypes were highly resistant to HLB. Losses in GY due to HLB ranged from 2 to 26%, and TKW was reduced by up to 33%. A few genotypes showed HLB tolerance, i.e., relatively smaller GY and TKW reductions despite high levels of HLB. In general, medium to late maturity and higher levels of HLB resistance and low to high GY and TKW characterized genotypes exotic to South Asia. Biplot analysis identified several genotypes that were HLB-resistant and agronomically superior. Results suggest it is possible to improve HLB resistance of local wheat cultivars based on selective breeding using this pool of germplasm.

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Abbreviations

BY:

biomass yield

DH:

days to heading

DM:

days to maturity

ETN:

effective tiller number

GY:

grain yield

HI:

harvest index

HLB:

Helminthosporium leaf blight

PHT:

plant height

TKW:

1000-kernel weight

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Authors and Affiliations

  1. Institute of Agriculture and Animal Science, Rampur, Chitwan, Nepal

    R. C. Sharma, S. Gyawali, S. M. Shrestha & N. K. Chaudhary

  2. CIMMYT, South Asia Regional Office, P.O. Box 5186, Kathmandu, Nepal

    E. Duveiller

  3. Local Initiatives for Biodiversity, Research and Development (LI-BIRD), Bharatpur, Chitwan, Nepal

    S. Gyawali

  4. National Wheat Research Program, Nepal Agricultural Research Council, Bhairahawa, Nepal

    M. R. Bhatta

Authors
  1. R. C. Sharma
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  2. E. Duveiller
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  3. S. Gyawali
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  4. S. M. Shrestha
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  5. N. K. Chaudhary
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  6. M. R. Bhatta
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Correspondence to R. C. Sharma.

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Sharma, R.C., Duveiller, E., Gyawali, S. et al. Resistance to Helminthosporium leaf blight and agronomic performance of spring wheat genotypes of diverse origins. Euphytica 139, 33–44 (2004). https://doi.org/10.1007/s10681-004-2292-2

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  • DOI: https://doi.org/10.1007/s10681-004-2292-2

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