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Evaluation of some flax plant introductions for powdery mildew resistance under natural infection conditions [electronic resource].

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Mansour, M. T. M

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Language: English Summary language: Arabic Description: p.2689-2697Other title:

تقييم بعض مستوردات الكتان من حيث المقاومة لمرض البياض الدقيقى تحت ظروف العدوى الطبيعية [Added title page title]

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Mansoura University journal of agricultural sciences, 2003 v. 28 (4) [electronic resource].

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In: Mansoura University Journal of Agricultural Sciences 2003.v.28(4)Summary: A two-year outdoor pot experiment was conducted at Giza Agricultural Research Station to (1) estimate heritability of powdery mildew resistance when d;sease incidence (01). and diEease severity (DS), were used as criteria to evaluate resistance, (2) assess resistance to powdery mildew of 43 flax plant introductions. Genotype components of variance of both 01 and DS were very highly significant (p s 0.000) each year indicating that extensive genetic variation for 01 and DS was present within the ested genotypes. Heritability for 01 ranged from 71.86 to 95.93%, while heritability for DS ranged from 91.59 to 94.35%. Genetic advance expected from selection based on 01 ratings ranged from 29.21 to 50.78, while that based on OS ranged from 39.62 to 40.45. 01 ratings ranged from 30 to 100% in 2001, and from 10.67 to 96.67% in 2002. OS ratings ranged from 15.85 to 100% in 2001, and from 15.13 to 92.47% in 2002. - Selection of the introductions for powdery mildew resistance was based on DS and not 01 because OS was environmentally more stable.

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A two-year outdoor pot experiment was conducted at Giza Agricultural Research Station to (1) estimate heritability of powdery mildew resistance when d;sease incidence (01). and diEease severity (DS), were used as criteria to evaluate resistance, (2) assess resistance to powdery mildew of 43 flax plant introductions. Genotype components of variance of both 01 and DS were very highly significant (p s 0.000) each year indicating that extensive genetic variation for 01 and DS was present within the ested genotypes. Heritability for 01 ranged from 71.86 to 95.93%, while heritability for DS ranged from 91.59 to 94.35%. Genetic advance expected from selection based on 01 ratings ranged from 29.21 to 50.78, while that based on OS ranged from 39.62 to 40.45. 01 ratings ranged from 30 to 100% in 2001, and from 10.67 to 96.67% in 2002. OS ratings ranged from 15.85 to 100% in 2001, and from 15.13 to 92.47% in 2002. - Selection of the introductions for powdery mildew resistance was based on DS and not 01 because OS was environmentally more stable.

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