Early generation selection for yield and breadmaking quality of hard red spring wheat (Triticum aestivum L. em thell.)

Abstract

Evaluation of the effect of selection in 3 different F 3 populations of hard red spring wheat was achieved for yield and breadmaking quality parameters by examining the subsequent performance of F 3 selections as populations of F 5 lines. For baking absorption the mean performance of the F5 populations was positively related to the performance of the F 3 selections in each of the 3 population-years . A significant relationship between the performance in F 3 and in F 5 was not obtained in any of the 3 years for bushel weight, flour ash, remix loaf volume, farinograph mixing tolerance index or for flour color grade . A high positive relationship between performance in F3 and F 5 was found in two out of three years for protein content, flour protein content and 1,000-kernel weight. Predictive ability for sedimentation value, flour yield, farinograph development time and blend loaf volume was inconsistent for different population-years .A positive relationship between the yield of F 3 plots and the mean yield of F 5 populations was found in only 1 year . In the other 2 years the relationship between F3 and F5 yields ranged from nonsignificant to low, negative and significant . The latter results were possibly related to the relatively narrow high yielding range of the total F 3 variability for yield which was sampled in each of those years . In all 3 population-years the highest yielding F 5 populations were derived from F 3 lines which were high yielding on a plot basis and also very high yielding relative to the yield of their adjacent control in the F 3 nursery .Broad sense heritabilities calculated for the F 5 generation support the thesis that selection between F 3-derived populations would be a worthwhile plant breeding procedure for many of the breadmaking quality parameters .

The effectiveness of early generation (F3) yield testing and the single seed descent procedures in two cowpea (Vigna unguiculata (L.) Walp.) crosses

“…Thus the relatively wide interrow spacing along with replications helped in reducing the competition effects . Similar correlation studies have between conducted in several self-pollinated crops such as soybeans, wheat, oats and barley but the various ranges of observed intergeneration correlations have been such that no firm conclusions can be drawn as to the effectiveness of early generation selection for yield (BRIGGS & SHEBESKI, 1971 ;DE PAUW & SHEBESKI, 1973 ;KNOTT & KUMAR, 1975 ;O'BRIEN et al ., 1978 ;WHAN et al ., 1981) . The resuts of this study, however, clearly indicated that early generation (F 3) selection for yield can be effective in cowpeas .…”

Evaluation of Early Generation Testing in Chickpea1)

“…SHEBESKI (1967) suggested yield testing in early generations when most of the variability is present, assuming that there is a positive relationship of the yield of the genotypes in the early generations with the yielding ability of the later generation derivatives of such genotypes. MAHMUD and KRAMER (1951) observed in soybean that F3 lines provided good estimates of the average yield potentials of F4 segregates if genotype-environment interaction can be kept under control.Results using the yields of F2 derived lines to predict the lines of later generations have been inconsistent (FREY 1954, MCKENZIE and LAMBERT 1961, BRIGGS and SHEBESKI 1971and KNOTT and KUMAR 1975 and often poor correlations were obtained. In some of these experiments, the generations were grown in different years, so the interaction between geriotype and environment could have affected the correlations.…”

“…Results using the yields of F2 derived lines to predict the lines of later generations have been inconsistent (FREY 1954, MCKENZIE and LAMBERT 1961, BRIGGS and SHEBESKI 1971and KNOTT and KUMAR 1975 and often poor correlations were obtained. In some of these experiments, the generations were grown in different years, so the interaction between geriotype and environment could have affected the correlations.…”

Selection for yield in small plots of spring wheat

“…Results of yield selection based on the performance of small F 3 plots have been inconsistent {ALESSANDRONI & SCALFATI, 1973;BRIGGS & SHEBESKI, 1971;DEPAUW & SHEBESKI, 1973;SElTZER & EvANS, 1978), but generally the response in later generations after selection for yield in earlier generations was disappointing.…”