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 Brandle, J. E. Articles by McVetty, P. B. E. Search for Related Content PubMed Articles by Brandle, J. E. Articles by McVetty, P. B. E. Agricola Articles by Brandle, J. E. Articles by McVetty, P. B. E.

Heterosis and Combining Ability in Hybrids Derived from Oilseed Rape Cultivars and Inbred Lines

Dep. of Plant Sci., Univ. of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2

^* Corresponding author.

Basic genetic information needed to develop hybrid oilseed rape (Brassica napus spp. oleifera) cultivars has not been previously reported. Since recent work had shown oilseed rape cultivars to be genetically heterogeneous, inbred line derived hybrids were compared to cultivar derived hybrids to determine if there were differences among inbred lines in terms of their performance in hybrid combination. For inbred line derived hybrids, midparent was compared to general combining ability as a means of predicting hybrid yield. Three inbred lines, from each of three source cultivars, were crossed using a factorial mating design and the resultant hybrids were field evaluated in three environments. The inbred lines, source cultivars, and cultivar hybrids were included as checks. Yields of inbred line derived hybrids were compared to their respective cultivar derived hybrids and some inbred line crosses were found to be significantly (P < 0.05) higher and others significantly (P < 0.05) lower yielding. There were also differences in general combining ability (GCA) effects among inbred lines. This result indicates the presence of variability in breeding values among cultivar derived inbred lines and that hybrid oilseed rape breeding programs should be based on inbred line crosses, rather than cultivar crosses. General combining ability (GCA) was significant (P < 0.01) and accounted for 88% of the cross sums of squares, while specific combining ability (SCA) was nonsignificant (P > 0.05) indicating that additive genetic effects predominantly influence the expression of yield. Regression of midparent on observed hybrid yield was significant (P < 0.01), with an r² of 0.37. Regression of expected hybrid yield, based on parental GCA, on observed hybrid yield was also significant (P < 0.01), but with an r² of 0.88. Therefore, GCA was more effective than midparent for describing hybrid yield. There was, however, a positive relationship between midparent and hybrid yield indicating that despite the somewhat low r², midparent may still be a useful guide for the selection of parents for testing in hybrid combination.

Received for publication October 26, 1988.

This article has been cited by other articles:

				A. Teklewold and H. C. Becker Heterosis and Combining Ability in a Diallel Cross of Ethiopian Mustard Inbred Lines Crop Sci., October 27, 2005; 45(6): 2629 - 2635. [Abstract] [Full Text] [PDF]

				P. A. Quijada, J. A. Udall, H. Polewicz, R. D. Vogelzang, and T. C. Osborn Phenotypic Effects of Introgressing French Winter Germplasm into Hybrid Spring Canola Crop Sci., November 1, 2004; 44(6): 1982 - 1989. [Abstract] [Full Text] [PDF]

				D.V. Butruille, R.P. Guries, and T.C. Osborn Increasing Yield of Spring Oilseed Rape Hybrids through Introgression of Winter Germplasm Crop Sci., September 1, 1999; 39(5): 1491 - 1496. [Abstract] [Full Text]