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Crop and Pasture Science Crop and Pasture Science Society
Plant sciences, sustainable farming systems and food quality
RESEARCH ARTICLE

Genomic analysis of carbon isotope discrimination, photosynthesis rate, stomatal conductance, and grain yield in wheat (Triticum aestivum L.) under water-stressed conditions

Shahram Mohammady A B , Roghayeh Aminian A , Sadolla Hoshmand A and Mahmood Khodombashi A
+ Author Affiliations
- Author Affiliations

A Faculty of Agriculture and Environmental Sciences, Shahrekord University, PO Box 115, Iran.

B Corresponding author. Email: mohammadyshahram@yahoo.com

Crop and Pasture Science 63(6) 513-519 https://doi.org/10.1071/CP12050
Submitted: 6 February 2012  Accepted: 2 July 2012   Published: 22 August 2012

Abstract

Chromosomal substitution lines of wheat variety Timstein (Tim) into the genetic background of variety Chinese Spring (CS) were used to evaluate the chromosomal location of genes controlling carbon isotope discrimination (Δ), photosynthesis rate (PR), stomatal conductance (SC), and grain yield. The experiment was carried out in the field at Shahrekord University Research Station. Considerable variation was observed among the substitution lines and between the parents for all traits. Chinese Spring had smaller values for the characters under study than Timstein. Significant correlations were found for grain yield with PR (r = 0.556) and Δ (r = 0.619). The substitution line CS (Tim2B) was significantly different from CS for Δ (P < 0.01). The substitution of homeologous group 3 chromosomes produced significant differences from the recipient variety for PR. Substitution lines CS (Tim3A), CS (Tim3B), CS (Tim4B), and CS (Tim1D) were significantly different from CS for SC. Genomic comparisons indicated that genome B had higher values of all four characters compared with the A and D genomes. Homeologous effects of genomes were documented for Δ and PR only and not for SC and grain yield.

Additional keywords: abiotic stress, chromosomal location, homeologous effects, substitution lines.


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