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Variation of Stem‐Solidness in Wheat 1
Author(s) -
Lebsock K. L.,
Koch E. J.
Publication year - 1968
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/cropsci1968.0011183x000800020027x
Subject(s) - sawfly , biology , heritability , stem rust , resistance (ecology) , agronomy , botany , genetics , hymenoptera
Solid‐stemmed wheats, Triticum aestivum L., em. Thell, grown for resistance to sawfly have been less productive than hollow‐stemmed varieties. Parent, F 1 , F 2 , F 3 , and F 4 populations from two wheat crosses, P.I. 56219‐12 × ‘Conley’ and Conley × ‘Rescue’, were evaluated in replicated field trials to determine if stem‐solidness was associated with agronomic and quality traits and with reactions to black chaff and stem rust infections. Variation in stem‐solidness was independent of variation in almost all other traits in both crosses. Statistically significant negative associations occurred, but they were weak and generally would be of little consequence in a breeding scheme. Rescue (solid‐stemmed) was a poorer combiner for yielding ability than P.I. 56219‐12 (solid‐stemmed) when crossed with Conley (hollow‐stemmed). Rescue has been the major source of stem‐solidness in breeding programs, and usually it has been crossed with locally adapted, high‐quality varieties. Heritability values for stem‐solidness ranged from 60% to 95%. Indirect selection for sawfly‐resistance using solidness as an indicator should be effective in any environment where solidness is expressed. Heritability values, and phenotyplc correlation coefficients for traits other than solidness are presented.