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Parent‐Offspring Relationships in Kleingrass, Panicum coloratum L. 1
Author(s) -
Potts Howard C.,
Holt Ethan C.
Publication year - 1967
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/cropsci1967.0011183x000700020016x
Subject(s) - biology , heritability , inbreeding , tussock , offspring , perennial plant , outbreeding depression , panicum , forage , agronomy , genetics , demography , pregnancy , population , sociology
Kleingrass ( Panicum coloratum L.), a recently introduced warm season, perennial bunchgrass, has many characteristics which are desirable in a forage grass. The relationship among and the variability in six agronomic characteristics of kleingrass were determined by the performance of both selfed ($1) and open‐pollinated (O.P.) progeny. Considerable genetic variation was apparent among the 42 parental clones, based on the performance of both types of progeny. “Broad sense” heritability estimates were similar regardless of the kind of progeny used for making these estimates. The “narrow sense” estimates, using the parent‐offspring regression method and based on S 1 progeny, indicated that the additive portion of genetic variance was limited. The same estimates based on O.P. progeny were 50 to 80% higher, indicating that considerable inbreeding took place in the parental plants of this reportedly cross‐pollinated species. The results of this study strongly support the theory that adjustment for inbreeding must be made to obtain accurate heritability estimates regardless of the species studied or the breeding system involved, symbolically h 2 = b/2r xy .