Genetic Variation In A Wide Gene Base Population Of Sweet Potato [Ipomoea Batatas (L) Lam]

Algerico  M. Mariscal,; Azucena  L. Carpena,

Genetic Variation In A Wide Gene Base Population Of Sweet Potato [Ipomoea Batatas (L) Lam]

Algerico M. Mariscal | Azucena L. Carpena

Abstract:

Design I mating system was used to estimate the components of genetic variation of sweet potato base population. Characters studied were total root yield, weight and number of marketable roots, total number of roots, fresh weight of vines, harvest index, scab rating and dry matter content of roots. Significant additive and dominance genotypic variances were observed in the population with high magnitude of the latter in all characters except in scab rating. The moderately high magnitudes of additive genetic variance for scab rating and dry matter content obtained suggest that the population may be im-proved using any available intrapopulation selection procedure like mass selection and full-sib family selection for the characters mentioned. Selected indivi-duals or full-sib families can be intercrossed to utilize the high dominance variation in the population. Dry matter content of the roots with its very low co-efficient of variability, is considered the most reliable basis for selection in this population.

References:

COMSTOCK, R.E. and ROBINSON, H.F. 1948. The components of genetic variance in population of biparental progenies and their use in estimating the average degree of dominance. Biometrics 4:254-266.
COMSTOCK, R.E. and ROBINSON, H.F. 1955. Analysis of genetic variability in corn with reference to probable effects of selections. CHS. Symp. on Quar. Biol. 20:127-136.
GARDNER, C.O. 1963. Estimates of genetic parameters in cross fertilizing plants and their application in plant breeding. In: Statistical Genetics and Plant Breeding. W.D. Hanson and H. F. Robinson (eds.). pp. 255-252.
HALLAUER, A.R. and MIRANDA, J.B. 1981. Quantitative Genetics in Maize Breeding. Iowa State University Press. 448 pp.
JONES, H. 1977. Heritability of seven sweet potato traits. Jour. ASHS 102: 404-446.
LI, L. 1975. Genetical studies of quantitative character in a randomly mating population of sweet potato. Jour. Agric. Res. in China 24:32-42.
LINDSEY, M.F., LONQUIST, N.J. and GARDNER, C.O. 1962. Estimates of genetic variance in open pollinated varieties of cornbelt. Crop. Sci. 2:105-108.
PASHHARON, K., SUKUMARAN, N. and GOPAKUMA, K. 1976. Analysis of yields and its components in sweet potato. Agric. Res. Jour. Kerala 4(2): 153-159.
ROBINSON, H.F., COMSTOCK, R.E. and HARVEY, P.H. 1949. Estimates of heritability and dominance in corn. Agron. J. 41:353-359.
THIBODEAUX, J.P. 1972. Combining ability and other factors affecting sweet potato breeding. Ph.D. Diss. LSU, Baton Rouge, Louisiana. 81 pp.
WANG, N. 1965. The breeding and cultivation of sweet potatoes. ASPAC Tech.Bull. 21:1-30.