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 Google Scholar Google Scholar Articles by Beversdorf, W. D. Articles by Daonnelly-Vanderloo, M. J. Search for Related Content PubMed Articles by Beversdorf, W. D. Articles by Daonnelly-Vanderloo, M. J. Agricola Articles by Beversdorf, W. D. Articles by Daonnelly-Vanderloo, M. J.

Agronomic Performance of Trianzine-Resistant and Susceptible Reciprocal Spring Canola Hybrids

Dep. of Crop Science, Univ. of Guelph, Guelph, Ontario, Canada N1G 2W1

^* Corresponding author.

Triazine-resistant (TR) spring rapeseed (canola) (Brussica napus L.) cultivars have been developed that permit selective chemical control of weeds but TR cultivars generally yield 20 to 30% less than triazine-susceptible (TS) cultivars. This lower yield in TR cultivars has been attributed to impaired electron flow between photosystems I1 and I. The objective of this experiment was to use reciprocal TR and TS hybrids to assess the effects of the TR trait in the same nuclear genetic background. The TR canola cv. OAC Triton was handcrossed with two TS cv., Topas and Hanna, to create reciprocal hybrids from each cross. The TR trait was cytoplasmically inherited so reciprocal hybrids were either TR or TS. Each cultivar plus the four hybrids were field tested in 1984 and 1985. The TR hybrids exhibited 21 and 25% lower yields than TS hybrids, flowered an average of 2 d later and had 8% lower mature plant heights. Days to maturity in the reciprocal hybrids were the same. The two TS hybrids exhibited an average of 14% high-parent heterosis for seed yield (2.96 vs. 2.60 Mg ha^–1). The TR hybrids yielded less than midparent averages and not significantly more than the TR parent (2.27 vs. 2.11 Mg ha^–1). The results suggest that TR hybrids will not perform well unless TR parental genotypes with more normal photosynthetic capabilities are found.

Received for publication September 28, 1986.