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Single‐Cross Hybrid Development in Maize by Reciprocal Half‐Sib Selection
Author(s) -
Sfakianakis J. N.
Publication year - 1995
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1995.0011183x003500010018x
Subject(s) - biology , hybrid , inbreeding , selection (genetic algorithm) , zea mays , inbred strain , reciprocal , agronomy , genetics , population , computer science , linguistics , philosophy , demography , artificial intelligence , sociology , gene
Maize ( Zea mays L.) inbred lines were developed from two diverse populations, Across‐8045 and GROP‐272, by a reciprocal half‐sib selection scheme for developing single‐cross hybrids. Selection, which was based on half‐sib progenies, was carried out both among and within lines during the S o × S o through S s × S s generations. Genetic gain was measured by comparing progeny yields to the mean of six adapted check hybrids each year. After six generations of inbreeding and selection, gain was 4.0% per generation for Across‐8045 and 6.5% per generation for GROP‐272. The mean yield of the S o × S o topcrosses was 17% less than that of the checks for Across‐8045 and 30% less than that of the checks for GROP‐272. The mean yield of the best S s × S s topcrosses was 11.8% greater than the mean of the checks for Across‐8045 and 15.8% greater than the mean of the checks for GROP‐272. The advantages of the breeding scheme are that it provides abundant half‐sib seed for testing while coupling the development of inbreds and hybrids throughout the process.