melhoramento das variedades paulistas de algodão. criação da iac 13-1 improvement of the são paulo cotton varieties origin and breeding of iac 13-1
تحسين أصناف القطن في ساو باولو. استنباط IAC 13-1. تحسين أصناف القطن في ساو باولو: منشأ وتربية IAC 13-1.
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Abstract
The origin and breending of the São Paulo cotton variety IAC 13-1, as well as the involved proceedings and numerical results are reported. The "eastern Acala" Acala 5675, selected at Knoxville, Tenn., from a Mexican cotton was introduced to São Paulo in 1950. It showed very good fiber qualities in the new environment. After nine years of acclimation and individual selection it yielded a promising line named IAG 61/60. IAC 13-1 was developped from this line by the general pedegree selection process adopted in breeding for final genetic balance by the Cotton Section of the Instituto Agronômico. The first stock of genetic seed was released for further increase in 1968. IAC 13-1 substituted the commercial variety IAC 12-2. This substitution signified an improvement in yield, type and size of bolls, size of seeds, fiber qualities and behaviour in areas contaminated by Fusarium oxysporum f. vasinfectum (Atk.) Snyder et Hansen.
يتناول هذا التقرير أصل صنف قطن ساو باولو IAC 13-1 وتربيته، فضلاً عن الإجراءات المتبعة والنتائج الرقمية ذات الصلة. أُدخلت سلالة "أكالا الشرقية" Acala 5675، المنتخبة في نوكسفيل بولاية تينيسي من قطن مكسيكي، إلى ساو باولو في عام 1950. وأظهرت خصائص ممتازة للألياف في البيئة الجديدة. وبعد تسع سنوات من التأقلم والانتخاب الفردي، أنتجت سلالة واعدة سُميت IAG 61/60. وطُوّر الصنف IAC 13-1 من هذه السلالة عبر طريقة الانتخاب النسبي العامة المعتمدة في التربية للوصول إلى التوازن الوراثي النهائي من قِبل قسم القطن في معهد البحوث الزراعية (Instituto Agronômico). وأُطلقت الدفعة الأولى من البذور الوراثية للتوسع في إكثارها عام 1968. حل الصنف IAC 13-1 محل الصنف التجاري IAC 12-2، وشكّل هذا الإحلال تحسناً في المحصول، ونوعية اللوزات وحجمها، وحجم البذور، وخصائص الألياف، وسلوك الصنف في المناطق الموبوءة بفطر *Fusarium oxysporum* f. *vasinfectum* (Atk.) Snyder et Hansen.
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cavaleri1975bragantiamelhoramento
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| Journal | revista espanola de salud publica |
| Year | 1975 |
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