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

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Related articles in Crop Science Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Web of Science (2) Citing Articles via Google Scholar Google Scholar Articles by Koemel, J. E. Articles by Smith, E. L. Search for Related Content PubMed Articles by Koemel, J. E., Jr. Articles by Smith, E. L. Agricola Articles by Koemel, J. E. Articles by Smith, E. L. Related Collections Wheat Plant and Environment Interactions Crop Genetics

CROP BREEDING, GENETICS & CYTOLOGY

Hybrid and Pureline Hard Winter Wheat Yield and Stability

^a Dep. of Plant and Soil Sci., Oklahoma State Univ., Stillwater, OK 74078-6028
^b Dep. of Statistics, Oklahoma State Univ., OK 74078

^* Corresponding author (acg{at}okstate.edu).

Pureline wheat (Triticum aestivum L.) cultivars continue to dominate production fields in the southern Great Plains despite numerous attempts to introduce hybrids during the past 28 yr. The objective of this study was to analyze yield trends and yield stability in both hybrid and pureline entries in the Oklahoma Variety-Hybrid Performance Nursery (VHPN). Grain yield data from 1975 to 1995 from four locations were selected and analyzed by relative yield indices. Regression equations across time were calculated for both hybrids and purelines relative to the mean performance of long-term check cultivars. Both hybrids and purelines evidenced yield improvement, with the yield of hybrids, in general, increasing at a greater rate than that of purelines. Predicted values in the last year tested indicated a 10.9% advantage of hybrids over purelines. Stability parameters were compared by regressing hybrid and pureline yields on an environmental index based on location mean yields for checks. Regression coefficients for hybrids and purelines were not significantly different from one, nor from each other. Confidence intervals for hybrid and pureline performance generally overlapped throughout the observed yield ranges, indicating no divergence in predicted grain yield as environmental yield potential increased. No significant differences in stability between hybrids and purelines were found by comparing variances represented by the pooled deviations for each cultivar type. Hybrid wheat offers an opportunity for increased grain yield in the southern Great Plains of the USA, but without a stability advantage over pureline cultivars.

Abbreviations: GE, cultivar type x environment • VHPN, Oklahoma Variety-Hybrid Performance Nursery

Related articles in Crop Science:

THIS ISSUE IN CROP SCIENCE

Crop Science 2004 44: 1-4. [Full Text]