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<p>Induced mutagenesis, a special breeding approach, is generally used to create novel variations in crops. In maize though ample variability exists for morphological traits, creation of heritable variation for yield component traits is very much essential to have good ideotypes. In this context an elite field corn inbred line was irradiated with High Energy Pulse Electron (HEPE) Beam to generate novel variation in kernel and cob related traits. Total 213 mutants were subjected to phenotypic characterization for Cob Length (CL), Cob Girth (CG), Kernel Row Number (KRN) and Kernel Number Per Row (KPR) and also genotyped with 50 SSR markers. Analysis of variance and estimated genetic component of variations clearly indicated that mutants generated through EB significantly differing from each other and variations were genetically controlled. Association analysis of kernel and cob related traits among mutants clearly suggested that EB has played a distinct role in breaking negative association among the yield component traits. Molecular marker analysis indicated that mutants were diverse from the wild type and there was an indication of presence of new alleles with low frequencies in the tested population for kernel and cob related traits. Total 10 best mutants were selected based on their traits means, among them mutant, EB24010202 seems to be most useful mutant as it is having most desirable character combination of high CG (4.7&#xa0;cm), CL (17&#xa0;cm), KRN (18) and KPR (28). Hence, it is clear that EB has successfully generated desirable variability with high heritability both at phenotypic and genotypic level. Mutants thus developed will be of great importance in future field corn improvement.</p>

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Assessment of Phenotypic Variability and Molecular Diversity Induced by High Energy Pulse Electron Beam for Yield Component Traits in Field Corn (Zea mays L.)

  • 期刊论文

  • 发表日期：

    2026年4月6日

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  • Mital S. Hadiya,
  • Ganapati Mukri,
  • Suvendu Mondal,
  • Jayant S. Bhat,
  • Shilpa Baliyan,
  • M. G. Mallikarjuna,
  • Chandu Singh,
  • Navin Chandra Gupta

摘要

Induced mutagenesis, a special breeding approach, is generally used to create novel variations in crops. In maize though ample variability exists for morphological traits, creation of heritable variation for yield component traits is very much essential to have good ideotypes. In this context an elite field corn inbred line was irradiated with High Energy Pulse Electron (HEPE) Beam to generate novel variation in kernel and cob related traits. Total 213 mutants were subjected to phenotypic characterization for Cob Length (CL), Cob Girth (CG), Kernel Row Number (KRN) and Kernel Number Per Row (KPR) and also genotyped with 50 SSR markers. Analysis of variance and estimated genetic component of variations clearly indicated that mutants generated through EB significantly differing from each other and variations were genetically controlled. Association analysis of kernel and cob related traits among mutants clearly suggested that EB has played a distinct role in breaking negative association among the yield component traits. Molecular marker analysis indicated that mutants were diverse from the wild type and there was an indication of presence of new alleles with low frequencies in the tested population for kernel and cob related traits. Total 10 best mutants were selected based on their traits means, among them mutant, EB24010202 seems to be most useful mutant as it is having most desirable character combination of high CG (4.7 cm), CL (17 cm), KRN (18) and KPR (28). Hence, it is clear that EB has successfully generated desirable variability with high heritability both at phenotypic and genotypic level. Mutants thus developed will be of great importance in future field corn improvement.