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Variability of In Vitro Dry Matter Digestion in Diallel and Polycross Progenies of Intermediate Wheatgrass 1
Author(s) -
Thaden Ronald T.,
Ross James G.,
Akyurek Ahmet
Publication year - 1975
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/cropsci1975.0011183x001500030028x
Subject(s) - diallel cross , biology , tiller (botany) , peduncle (anatomy) , agronomy , dry matter , population , cultivar , genetic variation , zoology , botany , genetics , gene , hybrid , demography , sociology
Variation in height, seed set, and in vitro dry matter digestion (IVDMD) within a diallel and a polycross nursery of intermediate wheatgrass, Agropyron intermedium (Host) Beauv., were studied. Significant differences in IVDMD of whole tillers occurred among diallel crosses, but did not occur among polycrosses, indicating greater precision of measurement in the diallel. Differences among diallel crosses for plant fraction (flag leaf, peduncle, and spike) IVDMD were also significant. Digestibility of the peduncle contributed the greatest effect to whole tiller digestibility. It was concluded, however, that digestibility of the upper part of the plant could not be used as an indicator of whole tiller digestibility. Correlations of height, seed weight for 10 heads, and seed set with IVDMD were low. Significant general combining ability, specific combining ability, and reciprocal effects were found for each character. General combining ability estimates were highest in one parent for almost all characters investigated. Since additive genetic effects were predominant, the variability within the diallel cross population should allow success in selection of a superior cultivar for the characters studied