Heterotic responses among crosses of IITA and CIMMYT early white maize inbred lines under multiple stress environments

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• 作者：B. Badu-Apraku ; M. A. B. Fakorede ; M. Gedil ; A. O. Talabi ; B. Annor…
• 关键词：Zea mays L. ; Heterotic grouping ; Low ; soil nitrogen ; Drought tolerance
• 刊名：Euphytica
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：206
• 期：1
• 页码：245-262
• 全文大小：670 KB
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• 作者单位：B. Badu-Apraku (1)
  M. A. B. Fakorede (3)
  M. Gedil (1)
  A. O. Talabi (1)
  B. Annor (1)
  M. Oyekunle (2)
  R. O. Akinwale (3)
  T. Y. Fasanmade (1)
  I. C. Akaogu (1)
  M. Aderounmu (1)
  
  1. International Institute of Tropical Agriculture (IITA), IITA (UK) Ltd, Carolyn House, 26 Dingwall Road, Croydon, CR9 3EE, UK
  3. Obafemi Awolowo University, Ile-Ife, Nigeria
  2. IAR, Zaria, Nigeria
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  Plant Sciences
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5060

文摘

Two major constraints militating against the achievement of food security in West Africa (WA) are recurrent drought and poor soil fertility. Seventeen early maturing maize inbreds from IITA and CIMMYT were used as parents to produce 136 diallel crosses which were evaluated along with four checks in contrasting environments at four locations for 2 year in Nigeria. The objectives of the study were to (i) examine the combining ability of the lines under drought, low soil nitrogen (low N), optimal and across environments; (ii) classify the inbreds into heterotic groups using the specific combining ability (SCA) effects of grain yield, heterotic group’s specific and general combining ability (HSGCA), the heterotic grouping based on general combining ability (GCA) of multiple traits (HGCAMT) and the molecular-based genetic distance methods; (iii) compare the efficiencies of the four heterotic grouping methods in classifying the inbreds and identifying the best testers; and (iv) examine the performance of the inbreds in hybrid combinations across environments. Sum of squares for GCA of inbreds for grain yield and other measured traits were larger than those of the SCA in all environments. The relative importance of GCA to SCA effects for grain yield and other traits increased from stress to nonstress environments with the additive genetic effects accounting for the major portion of the total genetic variation under all research environments. The HSGCA method classified the lines into three groups and was the most efficient because it had the highest breeding efficiency (40 %) in the test environments followed by the HGCAMT, SNP marker-based and the SCA effects of grain yield methods. Inbred TZEI 19 was identified as the best tester across research environments based on HSGCA method. Hybrids ENT 11 × TZEI 19 and TZEI 1 × TZEI 19 were the most outstanding and should be tested extensively in on-farm trials and commercialized. Keywords Zea mays L. Heterotic grouping Low-soil nitrogen Drought tolerance