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Plant sciences, sustainable farming systems and food quality
RESEARCH ARTICLE

Drought-tolerance indices in a tall fescue population and its polycross progenies

Maryam Ebrahimiyan A , Mohammad Mahdi Majidi A C , Aghafakhr Mirlohi A and Mahdi Gheysari B
+ Author Affiliations
- Author Affiliations

A Department of Agronomy and Plant Breeding, College of Agriculture, Isfahan University of Technology, Isfahan 84156-8311, Iran.

B Department of Water Engineering, College of Agriculture, Isfahan University of Technology, Isfahan 84156-8311, Iran.

C Corresponding author. Email: majidi@cc.iut.ac.ir

Crop and Pasture Science 63(4) 360-369 https://doi.org/10.1071/CP11279
Submitted: 5 October 2011  Accepted: 5 April 2012   Published: 21 May 2012

Abstract

Development of drought-tolerant cultivars is hampered by a lack of effective selection criteria. In this research, drought tolerance of 75 genotypes of tall fescue in three sets (25 parental, 25 early, 25 late-flowering progenies) was evaluated under no soil moisture stress and soil moisture stress in the field during 2009 and 2010. Five drought-tolerance indices were calculated: stress tolerance (TOL), mean productivity (MP), geometric mean productivity (GMP), stress susceptibility index (SSI), and stress tolerance index (STI). These calculations were based on forage yield (dry matter basis) under drought (Ys) and non-drought (Yp) conditions. Soil moisture stress caused significant reduction in forage yield. Considerable genetic variation for drought tolerance was found among genotypes. A moderately high relationship was found between Yp and Ys using regression analysis, with a clear relationship in the second year. Indices GMP and STI were found to be valuable aids in the selection of drought-tolerant, high-yielding genotypes. Plots of the first and second principal components identified drought-tolerant genotypes in each set. Results indicated that selection for drought-tolerant genotypes should be planned separately for first year (establishment stage) and second year (productive stage) in tall fescue.

Additional keywords: principal component analysis, selection index, soil moisture, tall fescue.


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