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Pathogenic races of Tilletia laevis - the causal agent of wheat common bunt in Iran

By: Contributor(s): Material type: TextTextPublication details: Tbilisi (Georgia) CIMMYT : 2004Description: p. 271Subject(s): DDC classification:
  • 633.1147 BED
Summary: To identify races of Tilletia laevis, several infected samples of wheat were collected from important wheat grown areas of Iran. Seeds of the differential monogenic and oligogenic lines were artificially infected with teliospores of different samples and grown in the field. At harvesting time, percentage of infected spikes was assessed for each line, and races of each sample were determined using standard method. According to the results, five isolates which were virulent to Bt7 were determined as race L-l , four isolates having virulence on Bt2 and Bt7 determined as L-3, two isolates with virulence on Btl and Bt7 determined as L-4, eight isolates virulent on Bt2, Bt3and Bt7 determined as L-I0 and one isolate with virulence on Bt2, Bt3, Bt4, Bt6 and Bt7 as race L-17 . Genes Bt2, Bt3, Bt7 were susceptible to the most of isolates therefore are not recommended to be used in breeding programs, Bt8, Bt9, Bt13 were susceptible to some isolates. Genes Btl , Bt4, Bt6 (except one race), Bt5, Btl0, Bt11, Bt12, Bt14 and Btp were resistant to all identified races; these genes will be effective for development of resistant cultivars in different parts of the country.
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library CIMMYT Publications Collection 633.1147 BED (Browse shelf(Opens below)) 1 Available 1K630072
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Abstract only

To identify races of Tilletia laevis, several infected samples of wheat were collected from important wheat grown areas of Iran. Seeds of the differential monogenic and oligogenic lines were artificially infected with teliospores of different samples and grown in the field. At harvesting time, percentage of infected spikes was assessed for each line, and races of each sample were determined using standard method. According to the results, five isolates which were virulent to Bt7 were determined as race L-l , four isolates having virulence on Bt2 and Bt7 determined as L-3, two isolates with virulence on Btl and Bt7 determined as L-4, eight isolates virulent on Bt2, Bt3and Bt7 determined as L-I0 and one isolate with virulence on Bt2, Bt3, Bt4, Bt6 and Bt7 as race L-17 . Genes Bt2, Bt3, Bt7 were susceptible to the most of isolates therefore are not recommended to be used in breeding programs, Bt8, Bt9, Bt13 were susceptible to some isolates. Genes Btl , Bt4, Bt6 (except one race), Bt5, Btl0, Bt11, Bt12, Bt14 and Btp were resistant to all identified races; these genes will be effective for development of resistant cultivars in different parts of the country.

English

0408|AGRIS 0401|AL-Wheat Program

Juan Carlos Mendieta

CIMMYT Publications Collection


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