HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Cregan, P. B. Articles by Busch, R. H. Search for Related Content PubMed Articles by Cregan, P. B. Articles by Busch, R. H. Agricola Articles by Cregan, P. B. Articles by Busch, R. H.

Early Generation Bulk Hybrid Yield Testing of Adapted Hard Red Spring Wheat Crosses¹

The parents, F₁, F₂ through F₅ bulks, and 519 F₅, lines from 28 crosses of a diallel produced from adapted high-yielding hard red spring wheats (Triticum aestivum L.) were grown in standard nursery plots at two locations in 1975. Our objective was to determine the value of 1975 midparent, F₁, and bulk generation yields and 1971-73 midparent and bulk generation yields as predictive criteria for identifying crosses producing high proportions of superior-yielding F₅ lines in 1975. Except for the 1971-73 midparental performance, all predictive criteria were significantly correlated with mean cross yield of F₅ lines. The highest correlation (r=0.81. P 0.01) was between F₅ line means and the 1975 F₂ bulk performance.

Of the F₅ lines which yielded at least two standard deviations above the overall line mean, 67 and 56% were derived from sets of seven crosses (upper 25%) chosen on the basis of the 1975 mean F₂ + F₃ bulk yields and the 1971-73 mean F₂ + F₃ bulk yields, respectively. This compared with 37 and 43% respectively, when 1975 and 1971-73 midparental performances were used to choose sets of seven crosses. While bulk yields were more useful than midparent yields in identifying superior crosses at the 25% selection intensity, the superiority of the bulks was not as great at a cross selection intensity of 50%.

Key Words: Breeding methods • Triticum aestivum L. • Genetic variances • Cross selection

² Former graduate research assistant (Present address: Cell Culture and Nitrogen Fixation Laboratory, Building 001, Beltsville Agricultural Research Center-West, Beltsville, MD 20705) and professor, Agronomy Dep., North Dakota State Univ., Fargo, ND 58102.

Received for publication March 17, 1977.

This article has been cited by other articles:

				J. W. Burton and C. Brownie Heterosis and Inbreeding Depression in Two Soybean Single Crosses Crop Sci., November 21, 2006; 46(6): 2643 - 2648. [Abstract] [Full Text] [PDF]

				P. S. Baenziger, W. K. Russell, G. L. Graef, and B. T. Campbell Improving Lives: 50 Years of Crop Breeding, Genetics, and Cytology (C-1) Crop Sci., September 8, 2006; 46(5): 2230 - 2244. [Abstract] [Full Text] [PDF]