Volume 3, Issue 1 (2001)
JAST 2001, 3(1): 43-49 |
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Saba J, Moghadam M, Ghassemi K, Nishabouri M R. Genetic Properties of Drought Resistance Indices. JAST 2001; 3 (1) :43-49
URL: http://jast.modares.ac.ir/article-23-5572-en.html
URL: http://jast.modares.ac.ir/article-23-5572-en.html
1- Department of Crop Prouction and Breeding, Faculty of Agriculture, Zanjan University, Zanjan, Islamic
Republic of Iran, 45195.
2- Department of Crop Production and Breeding, Faculty of Agriculture, Tabriz University, Tabriz, Islamic Rebublic of Iran, 51664.
3- Department of Soil Science, Faculty of Agriculture, Tabriz University, Tabriz, Islamic Republic of Iran, 51664.
2- Department of Crop Production and Breeding, Faculty of Agriculture, Tabriz University, Tabriz, Islamic Rebublic of Iran, 51664.
3- Department of Soil Science, Faculty of Agriculture, Tabriz University, Tabriz, Islamic Republic of Iran, 51664.
Abstract: (6078 Views)
Inheritance of several yield-based drought resistance indices was studied by a halfdiallel
method using seven winter wheat varieties. The parental lines were such chosen as
to represent a broad range of drought stress resistance. The experiment was conducted in
a split-plot design at the research farm, Faculty of Agriculture, Zanjan University, Iran,
in 1998. Irrigated vs. rainfed regimes were considered as the main plots. The F1 hybrids
and parental varieties constituted the subplots. From the grain yield data, some drought
resistance indices such as geometric mean productivity (GMP), mean productivity (MP),
standard superiority measure (SP), stress susceptibility index (SSI), stress tolerance index
(STI), superiority measure (P), and tolerance (TOL) were calculated. Genetic components
of variance and heritabilities were estimated using Gardner and Eberhart’s Method 3,
Model II. Significant differences among parents and F1s were observed for all indices except
for SSI and TOL. Significant general combining abilities (GCA) were obtained for
GMP, MP, P, SP, STI, and TOL but not for SSI. Therefore, except for SSI, other indices
could be regarded as heritable. The specific combining ability (SCA) effects were also
highly significant for GMP, MP, P, SP, and STI. However, additive variances were more
important than dominance ones. Narrow-sense heritability estimates were very low for
SSI, low for TOL, but moderate for GMP, MP, P. SP, and STI. Thus selection based on
the latter indices could be more promising than on SSI and TOL. It seems that SP and
STI might be better yield-based drought resistance indices to be employed in plant breeding
programs, because of their moderate narrow-sense heritabilities and the inherent ability
of selecting high yielding genotypes in either stressed or non-stressed conditions.
Subject:
Plant Breeding
Received: 2010/05/15 | Accepted: 2010/05/15 | Published: 2010/05/15
Received: 2010/05/15 | Accepted: 2010/05/15 | Published: 2010/05/15
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