Locating QTLs controlling drought tolerance criteria in rye using disomic addition lines

R. Mohammadi, E. Farshadfar, M. Aghaee-Sarbarzeh, J. Sutka

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Abstract

Drought stress is one of the most important threatening factors for the production of crop plants in the arid and semi-arid regions of the world. The related species of wheat are valuable genetic material for different traits including resistance/tolerance to biotic and abiotic stresses. To locate the genes controlling drought tolerance disomic addition lines of Imperial rye (donor) in the genetic background of Chinese Spring (recipient) were tested in a completely randomized design in controlled condition, and in a randomized complete block design in the field condition each with three replications. The materials were tested under two different water regimes (irrigated and rainfed) in the Agricultural Research Station of College of Agriculture, Razi University, Kermanshah, Iran. The potential yield (Yp), stress yield (Ys), Promptness Index in stress (PIS) and non-stress (PINS) condition, Germination Stress Index (GSI), Stress Tolerance Index (STI), Coleoptile Length (COL), Primary Root Length (PRL), and Primary Root No. (PRN) were recorded. The results of analysis of variance exhibited highly significant differences among the lines for all the traits, except PRN indicating the presence of genetic variation and possible chromosomal localization of the genes controlling the traits investigated. Mean comparison of different traits revealed that most of the genes controlling yield and drought tolerance related traits are located on chromosomes 7R, 3R, and 5R. Cluster analysis of addition lines for GSI also placed the lines carrying these chromosomes in a group with higher GSI. Correlation analysis indicated strong association between STI with GSI, COL, and PRL. Therefore these criteria may be screened for indirect selection of drought tolerance in the initial stages of the crop growth.

Original languageEnglish
Pages (from-to)257-264
Number of pages8
JournalCereal Research Communications
Volume31
Issue number3-4
Publication statusPublished - Nov 14 2003

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Keywords

  • Addition line
  • Drought tolerance
  • Gene location
  • Secale cereale
  • Wheat

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Genetics

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