Comparing the efficiency of the three heterotic-group and traditional two heterotic-group classifications for the hybrid maize breeding

Document Type : Research Paper

Author

Seed and Plant Improvement Institute, Karaj, Iran.

Abstract

Increasing the efficiency of the hybrid-based maize breeding program has highly contributed to the heterotic group classification. The present study was aimed to compare the breeding efficiency of the three heterotic-group (TriHG) classification [Lancaster Sure Crop (LSC), Reid Yellow Dent (RYD), CIMMYT] system and usual two heterotic-group (DiHG) classification (RYD, LSC) system. To accomplish this, specific breeding efficiency (SBE) and general breeding efficiency (GBE) were estimated for the grain yield. The mating design was a line × tester scheme in which seven adapted tropical and subtropical lines were crossed to four testers. GBE increased by 128% in the TriHG classification system as compared to the DiHG system while no significant loss was observed in SBE. It seems that the TriHG system was advantageous over the DiHG system by improving the maize breeding efficiency. Therefore, using one tester from each of the three heterotic groups (RYD, LSC, CIMMYT) could be more efficient in hybrid-based maize breeding programs in temperate regions, including Iran.

Keywords

Article Title [Persian]

مقایسه بازده سیستم سه گروه-هتروتیکی (TriHG) و دو گروه-هتروتیکی سنتی (DiHG) برای اصلاح هیبرید ذرت

Author [Persian]

  • محمدرضا شیری
موسسه تحقیقات اصلاح و تهیه نهال و بذر، کرج
Abstract [Persian]

تعیین گروه هتروتیک لاین­ های ذرت کمک زیادی به افزایش کارآیی برنامه­ های اصلاح ذرت مبتنی بر تولید هیبرید کرده است. بنابراین، مطالعه حاضر با هدف مقایسه کارآیی برنامه اصلاح ذرت با سیستم سه گروه-هتروتیکی (TriHG) شامل گروه­ های هتروتیک Lancaster Sure Crop (LSC)، Reid Yellow Dent (RYD) و CIMMYT و سیستم دو گروه-هتروتیکی سنتی (DiHG) شامل گروه ­های هتروتیک RYD وLSC، انجام گرفت. برای دستیابی به این هدف، بازده خصوصی برنامه اصلاحی (SBE) و بازده عمومی برنامه اصلاحی(GBE) برای عملکرد دانه برآورد شدند. هفت لاین سازگار با منشاء نواحی گرمسیری و نیمه ­گرمسیری با چهار تستر در قالب طرح تلاقی لاین × تستر تلاقی داده شدند. سیستم TriHG در مقایسه با سیستمDiHG  بازده خصوصی برنامه اصلاحی را بدون کاهش محسوس در بازده عمومی، 28 درصد افزایش داد. به نظر می­ رسد که در برنامه اصلاح ذرت مبتنی بر تولید هیبرید، استفاده از سه تستر با یک تستر از هر یک از گروه­ های هتروتیک RYD، LSC وCIMMYT  در مناطق معتدل کارآمدتر از سیستم DiHG باشد. لذا توصیه می ­گردد جهت افزایش کارآیی برنامه­ های اصلاح ذرت در کشور، از سیستم TriHG استفاده شود.

Keywords [Persian]

  • الگوی هتروتیکی
  • گروه هتروتیکی
  • لاین × تستر
  • DiHGY
  • TriHG

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Journal of Plant Physiology and Breeding
Volume 10, Issue 2
December 2020
Pages 99-107

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