EFFECTS OF EXTENSION OF DAYS TO FLOWERING ON YIELD AND OTHER CHARACTERS OF EARLY MATURING SOYBEAN
Keywords:
soybean breeding, single seed descent, early maturing variety, correlation between charactersAbstract
Early maturing varieties of soybean are low yielding due to their small plant stature and short vegetativeperiod. The objective of this research was to develop early varieties of soybean with extended days toflowering while keeping the days from flowering to maturity intact. Crosses were made between twoearly (CM2 and NS1) and two late (CB1 and LJ4) maturing varieties. Conventional and modifiedsingle seed descent methods were used to select for late flowering but early maturing relative to theearly maturing parents. Eleven selected lines were tested for three seasons using two early maturingparents and SJ5, a medium maturing variety, as the standard check and it was found that four lines,C-3108, M-3213, M-3215, and M-3217, outyielded both early parents and the standard check, SJ5.These lines gave more days to flowering than the early maturing parental checks, but the days fromflowering to maturity were similar to the early checks. The correlation between the yield with days tomaturity was not important but with days to flowering it was significant. This experiment showed thatthe extension of days to flowering resulted in an increase of the yielding potential of early maturingsoybean.
References
Burton, J.W. (1987). Quantitative Genetics:Results Relevant to Soybean Breeding.In: Soybeans: Improvement, Productionand Uses. Wilcox, J.R. (ed.). AmericanSociety of Agronomy, Madison, WI, USA,p. 211-247.
Dunphy, E.J., Hanway, J.J., and Green, D.E.(1979). Soybean yields in relation to daysbetween specific developmental stages.Agron. J., 71:917-920.
Hartwig, E.E. (1970). Growth and reproductivecharacteristics of soybean [Glycine max(L) Merr.] grown under short-dayonditions. Trop Sci., 12:47-53.
Hasan, E., Arshad, M., Ahsan, M., and Saleem,M. (2008). Genetic variability andinterrelationship for grain yield and itsvarious components in chickpea (Cicerarietinum L.). J. Agric. Res., 46(2):109-115.
Ishibashi, T., Sneller, C.H., and Shannon, G.(2003). Soybean yield potential andphenology in the ultra-short-seasonproduction system. Agron. J., 95:1082-1087.
Machikowa, T., Waranyuwat, A., Burton, J.W.,and Laosuwan, P. (2007). Yieldimprovement of early maturing soybeansby selection for late flowering and earlymaturity. ScienceAsia, 33:229-234.
Malik, M.F.A., Ashraf, M., Qureshi, A.S., andGhafoor, A. (2006). Utilization of diversegermplasm for soybean yield improvement.Asian J. Plant Sci., 5(4):663-667.
Mayers, J.D., Lawn, R.J., and Byth, D.E. (1991).Agronomic studies on soybean (Glycinemax (L.) Merr) in the dry season ofthe tropics I. Limits to yield imposed byphenology. Aust. J. Agr. Res., 42:1,075-1,092.
Niessl, H., Vollmann, J., and Ruckenbauer, P.(1995). Selection for time to maturity insoybean (Glycine max (L.) Merrill) andseed protein content of early maturinggenotypes. Die Bodenultur, 46:311-320.
SAS Institute Inc. (1985). SAS user’s guide:Statistics, version 5ed. SAS Institute Inc.Cary, NC.
Weber, C.R. and Moorthy, B.R. (1952). Heritableand non-heritable relationships andvariability of oil content and agronomiccharacters in the F2 generation of soybeancrosses. Agron. J., 44:202-209.
Xu, H. and Wilcox, J.R. (1992). Recurrentselection for maturity and percent seedprotein in Glycine max based on S0 plantevaluations. Euphytica, 62:51-57.
