Clonal evaluation for increased seed production in two species of forage grasses, Festuca arundinacea Schreb. and Phleum pratense L.
Tóm tắt
A study was made of the seed production characters of replicated single plants of two Aberystwyth varieties, S.170 tall fescue and S.48 timothy, and estimates were made of the total genetic variation and the heritability of each character. Six-plant selections were made from each of the two varieties, and performance trials indicated that seed yield had been increased by 20% in tall fescue and 47% in timothy. As indicated by the measurements on single plants, increases in seed weight per inflorescence were almost wholly responsible for the increase in seed yield, with the number of inflorescences remaining unaltered in the two new selections. The mean inflorescence size of both selections was similar to that of the two varieties, but floret fertility and 1000-seed weight were significantly increased. In S.48 timothy there was also an improvement in the facility with which seed could be threshed from the mature inflorescence.
Tài liệu tham khảo
Burton, G. W. & De, Vane, E. H., 1953. Estimating heritability in tall fescue (Festuca arundinacea) from replicated clonal material. Agron. J. 45: 478–481.
Burton, G. W., 1959. Breeding methods for pearl millet (Pennisetum glaucum) indicated by genetic variance component studies. Agron. J. 51: 479–481.
Cowan, J. R., 1955. Rep. 9th West Grass Breeders Work Planning Conf.; 26–30.
Johnson, H. W., Robinson, H. F. & Comstock, R. E., 1955. Estimates of genetic and environmental variability in soybeans. Agron. J. 47: 314–318.
Lowe, C. C. & Murphy, R. P., 1955. Open-pollinated seed setting among self-sterile clones of smooth bromegrass. Agron. J. 47: 221–224.
Schaaf, H. M., Rogler, G. A. & Lorenz, R. J., 1962. Importance of variations in forage yield, seed yield and seed weight to the improvement of crested wheatgrass. Crop Sci. 2: 67–71.
Slinkard, A. E., 1965. Fertility in intermediate wheatgrass Agropyron intermedium (Host) Beauv. Crop Sci. 5: 363–365.
Thomas, J. R., & Frakes, R. V., 1967. Clonal and progeny evaluations in two populations of tall fescue (Festuca arundinacea Schreb). Crop Sci. 7: 55–58.