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Detection of partial resistance components of leaf rust in new four Egyptian wheat cultivars [electronic resource].

By:

EL-Shamy, M. M

Contributor(s):

Mousa, M. M

Language: English Summary language: Arabic Description: p.161-170Other title:

تقدير مكونات المقاومة الجزئية لصدأ الأوراق في أربعة أصناف مصرية من القمح [Added title page title]

Uniform titles:

Journal of agricultural research Tanta University, 2004 v.30 (2) [electronic resource].

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In: Journal of Agricultural Research Tanta Univeristy 2004.v.30(2)Summary: Four new Egyptian wheat cultivars, Gemmeiza-7,Gemmeiza-9, Sakha 93 and Giza. 168 were tested for slow rusting against two leaf rust races, i.e. 77 ( virulent) and 130 (avirulent). At seedling stage, the cultivar Gemmeiza - 9 exhibited the longest latent period , the lowest number of pustules/cm2 and moderate resistant infection type . On contrast, the cultivars Gemmeiza- 7 and Sakha 93 had the lowest latent period , the highest number of pustules / cm2 and susceptible infection type, The cultivar Giza 168 showed moderate values of the two parameters . A high positive correlation was found between latent period and number of pustules / cm2 At adult stage , the cultivar Gemmeiza 9 showed moderate resistant / moderate susceptible response (MR / MS ) to a mixture of 77 and 130 leaf rust races and exhibited the lowest values of average coefficient of infection (ACI) and area under disease progress curve (AUDPC). Consequently , it gave the highest grain yield / plot ( 3.357 and 3.354 Kg. ) and 1000 grain weight (43.640 and 43.610 gm) either under protected or rusted plots and showed small losses ( 0.09 and 0.07 % , respectively). Giza 168 wheat cultivar showed low susceptible response (20-S) and low values oflosses (0.59 and 0.32) .The cultivars Gemmeiza 7 and Sakha 93 had high disease severity ( 70-S and 60-S ) and the loss in grain yield / plot and 1000 kernel weight were 8.38 , 7.30 % and 7.09 and 6.93 % , respectively.

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Four new Egyptian wheat cultivars, Gemmeiza-7,Gemmeiza-9, Sakha 93 and Giza. 168 were tested for slow rusting against two leaf rust races, i.e. 77 ( virulent) and 130 (avirulent). At seedling stage, the cultivar Gemmeiza - 9 exhibited the longest latent period , the lowest number of pustules/cm2 and moderate resistant infection type . On contrast, the cultivars Gemmeiza- 7 and Sakha 93 had the lowest latent period , the highest number of pustules / cm2 and susceptible infection type, The cultivar Giza 168 showed moderate values of the two parameters . A high positive correlation was found between latent period and number of pustules / cm2 At adult stage , the cultivar Gemmeiza 9 showed moderate resistant / moderate susceptible response (MR / MS ) to a mixture of 77 and 130 leaf rust races and exhibited the lowest values of average coefficient of infection (ACI) and area under disease progress curve (AUDPC). Consequently , it gave the highest grain yield / plot ( 3.357 and 3.354 Kg. ) and 1000 grain weight (43.640 and 43.610 gm) either under protected or rusted plots and showed small losses ( 0.09 and 0.07 % , respectively). Giza 168 wheat cultivar showed low susceptible response (20-S) and low values oflosses (0.59 and 0.32) .The cultivars Gemmeiza 7 and Sakha 93 had high disease severity ( 70-S and 60-S ) and the loss in grain yield / plot and 1000 kernel weight were 8.38 , 7.30 % and 7.09 and 6.93 % , respectively.