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Using of the international nurseries in improvement of yellow rust resistance in local wheat varieties

By: Contributor(s): Material type: TextTextPublication details: Tbilisi (Georgia) CIMMYT : 2004Description: p. 263Subject(s): DDC classification:
  • 633.1147 BED
Summary: Germplasm exchange among the countries is widely practiced in the world and contributes to identification of high yielding wheat varieties that are adapted to environments of different regions. At present, on the basis of the agreements signed between RI of Agriculture and the international centers (ICARDA and CIMMYT), as well as other research centers of the neighboring countries, a great number of bread and durum wheat entries are exported annually to our country. These varieties are released and studied in various regions of the republic. The major objective of the study was the screening of the introduced entries for reaction to yellow rust, and identification of resistant lines. The study has begun in 1995 and a certain number of resistant bread and drum wheat varieties have been identified and selected. The disease notes were taken based on the Cabb 's scale. The results of the screening carried out in 1995-2000 showed that 125 (23.4%) out of 535 entries were completely immune (reaction type 0), 57 (10.6%) entries demonstrated resistant reaction (R), 110 (20.5%) entries were found to be moderately resistant (MR), 171 (31.9%) entries were moderately susceptible (MS) and 72 (13.4%) entries showed susceptible reaction. In 2000-2001, out of 787 samples, 600 (77.12%) entries were found to be completely resistant (R), moderately resistant reaction (MR) was demonstrated by 53 (6.7%) entries, moderately susceptible (MS) were 35 (4.4%) entries, while susceptible reaction (S) was shown by 99 (11.8%) entries. In 2001-2002, out of226 samples, completely resistant were 85 (37.6% ) entries, resistant were 64 (28.3%) entries, moderately resistant were 20 (8.8%) entries, moderately susceptible were 25 (11.1 %), and susceptible were 32 (14.2%) entries. In 2003, on the study sites on the Apsheron peninsula, as a result of the sharp air temperature fluctuations, severity of yellow rust epidemic was low. Such environment is not favorable for screening of winter wheat germplasm for yellow rust resistance. The immune (completely resistant) entries selected as a result of the screening are used in breeding for yellow rust resistant wheat varieties.
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Item type Current library Collection Call number Copy number Status Date due Barcode Item holds
Conference proceedings CIMMYT Knowledge Center: John Woolston Library CIMMYT Publications Collection 633.1147 BED (Browse shelf(Opens below)) 1 Available 1B630072
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Abstract only

Germplasm exchange among the countries is widely practiced in the world and contributes to identification of high yielding wheat varieties that are adapted to environments of different regions. At present, on the basis of the agreements signed between RI of Agriculture and the international centers (ICARDA and CIMMYT), as well as other research centers of the neighboring countries, a great number of bread and durum wheat entries are exported annually to our country. These varieties are released and studied in various regions of the republic. The major objective of the study was the screening of the introduced entries for reaction to yellow rust, and identification of resistant lines. The study has begun in 1995 and a certain number of resistant bread and drum wheat varieties have been identified and selected. The disease notes were taken based on the Cabb 's scale. The results of the screening carried out in 1995-2000 showed that 125 (23.4%) out of 535 entries were completely immune (reaction type 0), 57 (10.6%) entries demonstrated resistant reaction (R), 110 (20.5%) entries were found to be moderately resistant (MR), 171 (31.9%) entries were moderately susceptible (MS) and 72 (13.4%) entries showed susceptible reaction. In 2000-2001, out of 787 samples, 600 (77.12%) entries were found to be completely resistant (R), moderately resistant reaction (MR) was demonstrated by 53 (6.7%) entries, moderately susceptible (MS) were 35 (4.4%) entries, while susceptible reaction (S) was shown by 99 (11.8%) entries. In 2001-2002, out of226 samples, completely resistant were 85 (37.6% ) entries, resistant were 64 (28.3%) entries, moderately resistant were 20 (8.8%) entries, moderately susceptible were 25 (11.1 %), and susceptible were 32 (14.2%) entries. In 2003, on the study sites on the Apsheron peninsula, as a result of the sharp air temperature fluctuations, severity of yellow rust epidemic was low. Such environment is not favorable for screening of winter wheat germplasm for yellow rust resistance. The immune (completely resistant) entries selected as a result of the screening are used in breeding for yellow rust resistant wheat varieties.

English

0408|AGRIS 0401|AL-Wheat Program

Juan Carlos Mendieta

CIMMYT Publications Collection


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