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This article in CS

  1. Vol. 34 No. 4, p. 838-841
     
    Received: Mar 16, 1993
    Published: July, 1994


    * Corresponding author(s): kronstaw@css.orst.edu
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doi:10.2135/cropsci1994.0011183X003400040004x

Grain Filling Parameters and Protein Content in Selected Winter Wheat Populations: II. Associations

  1. Beiquan Mou,
  2. Warren E. Kronstad  and
  3. N. N. Saulescu
  1. Crop and Soil Dep., Oregon State Univ., Corvallis, OR 97331

Abstract

Abstract

Understanding the relationship between grain filling (GF) characteristics, earliness, and N accumulation would aid in improving grain size and grain protein content in wheat (Triticum aestivum L.). significant association of early anthesis, long GF duration, low GF rate, and high protein concentration was found in a set of F1 hybrids and their parents from a 4 × 4 diallel cross involving Chinese and U.S. cultivars. This association was also found in an F2 population of a cross between an early hard red winter Chinese wheat and a late soft white winter U.S. cultivar. Expressing GF duration and rate on a temperature basis (degree days) removed the correlation between anthesis date and GF parameters and showed that the early parent with a longer GF duration in days actually required less degree days for GF than did the late-heading parent. Regardless of the way of expressing GF parameters, a significant negative correlation was found between rate and duration of GF, suggesting a physiological barrier in combining high values for both traits. Kernel weight was significantly correlated with GF rate but not with GF duration, opening the possibility of breeding early maturing cnitivars with reduced GF period without sacrificing grain weight. Grain protein concentration was negatively correlated with GF rate and positively correlated with GF duration, regardless if GF parameters were expressed on a time or temperature basis. These results suggest that improvements in both grain size and grain protein concentration will be difficult but not impossible and that selecting for long GF duration might be beneficial in this respect. Expressing GF parameters on a temperature basis proved useful in removing the differential influence of temperature variation on plants of different earliness.

Technical paper no. 10074 of the Agric. Exp. Stn., Oregon State Univ.

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Copyright © 1994. Crop Science Society of America, Inc.Copyright © 1994 by the Crop Science Society of America, Inc.