About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in CS

  1. Vol. 34 No. 2, p. 423-427
     
    Received: June 17, 1993


    * Corresponding author(s):
 View
 Download
 Alerts
 Permissions
Request Permissions
 Share

doi:10.2135/cropsci1994.0011183X003400020022x

Quantitative Inheritance of Forage Quality Traits in Intermediate Wheatgrass

  1. J. D. Berdahl ,
  2. J. F. Karn and
  3. S. T. Dara
  1. Land Reclamation Research Center, North Dakota State Univ., P.O. Box 459, Mandan, ND 58554

Abstract

Abstract

Knowledge of heritability and inheritance of nutritive quality traits in intermediate wheatgrass [Thinopyrum intermedium (Host) Barkw. & D.R. Dewey] would be helpful in choosing effective selection techniques. This study assesses variation and heritability of traits associated with hay quality in intermediate wheatgrass, ascertains the relative magnitude of general and specific combining ability (SCA and GCA) for these traits, and examines relationships among important agronomic and quality traits. Six parent clones and the 15 progenies from a diallel cross (reciprocal crosses not included) were evaluated in a replicated field test for in vitro digestible organic matter (IVDOM), neutral detergent fiber (NDF), and N concentration of whole plants, leaf blades, and stems (stem plus leaf sheath). Spike emergence date, plant height, and leaf/stem ratio were also measured. Variation among progenies was significant for all traits except leaf IVDOM and whole-plant N. Leaf/stem ratios varied from 0.22 to 0.28 among progenies, with stems contributing more to whole-plant IVDOM than did leaf blades. Low variation in whole-plant N concentration limits the potential for forage N improvement. Spike emergence date, a measure of relative plant maturity, was correlated positively with IVDOM (r = 0.75**) and negatively with NDF (r = −0.61*). Narrow-sense heritability estimates were moderately high for whole-plant IVDOM and for IVDOM, NDF, and N of stem and leaf fractions. Variance components for GCA were generally higher than those caused by SCA. Year effects for IVDOM and NDF were high, but year × GCA and year × SCA interaction effects for these traits were not significant. Selection for high whole-plant IVDOM in a single environment employing recurrent phenotypic selection or other selection techniques that utilize additive genetic variance should be effective in improving digestibility of intermediate wheatgrass hay.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

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