About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in CS

  1. Vol. 50 No. 1, p. 93-104
     
    Received: Feb 3, 2009


    * Corresponding author(s): jdubcovsky@ucdavis.edu
 View
 Download
 Alerts
 Permissions
Request Permissions
 Share

doi:10.2135/cropsci2009.02.0057

Effects of the Chromosome Region Including the Gpc-B1 Locus on Wheat Grain and Protein Yield

  1. Juan Carlos Brevis and
  2. Jorge Dubcovsky *
  1. Dep. of Plant Sciences, Univ. of California, Davis, CA 95616-8780; J. Brevis current address: Enza Zaden, San Juan Bautista, CA 95045

Abstract

The recent cloning of the Gpc-B1 gene from Triticum turgidum ssp. dicoccoides (Körn. ex Asch. and Graebn.) Thell. (DIC hereafter) chromosome 6BS revealed that modern wheat varieties have a nonfunctional allele. The DIC allele accelerates senescence and increases grain protein concentration (GPC) relative to the nonfunctional allele, but its effect on yield is not known. Here we describe the effect of Gpc-B1 on grain yield, grain weight, protein yield (grain yield by GPC), and N harvest index (NHI) of common (T. aestivum L.) and durum [T. turgidum ssp. durum (Desf.) Husn.] wheat using BC6F3 near-isogenic lines (NILs, >99% identical) with and without the DIC Gpc-B1 allele. Six hexaploid and three tetraploid pairs of NILs were tested in three California locations (2005–2007) and all showed higher GPC when the functional Gpc-B1 allele was present (P < 0.0001). Hexaploid NILs with the DIC Gpc-B1 allele showed a significant decrease in grain weight (2.8%, P = 0.0004) and a similar trend was observed between tetraploid NILs, although the differences were marginally not significant (P = 0.08). In spite of this reduction, the differences in grain yield between NILs with different Gpc-B1 alleles across genotypes and environments were not significant. Protein yield was increased in the Gpc-B1 NILs of both hexaploid (P < 0.0001) and tetraploid (P = 0.06) wheat. The Gpc-B1 introgression in hexaploid NILs resulted in significantly (P < 0.01) lower straw N concentration at maturity and higher NHI, which suggests that the functional Gpc-B1 allele improves N remobilization.

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

Copyright © 2010. Crop Science Society of AmericaCrop Science Society of America