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Articles by R. Haghparast
Total Records ( 3 ) for R. Haghparast
  E. Farshadfar , M. Qaitoli and R. Haghparast
  In order to locate the genes involved in the inheritance of agronomic and physiological indicators of drought tolerance an experiment was carried out using a wheat-barley disomic addition lines. The results of analysis of variance revealed highly significant differences for most of the traits investigated. Mean comparison exhibited that most of the genes controlling drought tolerance criteria are located on chromosomes 4H and 5H. The overall consideration of the indices using Stress Tolerance Index (STI), Germination Stress Index (GSI) and physiological Multiple Selection Index (MSI) indicated that most of the genes responsible for the inheritance of drought tolerance predictors are located on chromosomes 4H and 5H, hence they can be transferred for the breeding of drought tolerance in barley through chromosome engineering and for mapping QTLs by the molecular breeding procedures. A three dimensional-plot and cluster analysis confirmed the same conclusion. Correlation analysis discarded chlorophyll a and b also proline as an indicator of drought tolerance, but proved that Excised Leaf Water Retention (ELWR), Relative Water Content (RWC), Relative Water Deficit (RWD), Relative Water Loss (RWL), Chlorophyll Fluorescence (CHF), Cell Membrane Stability (CMS) and Leaf Chlorophyll Content (LCC) are physiological indices of drought tolerance and they can be used for the improvement of drought tolerance and grain yield via correlated response. Association between field (STI) and laboratory (GSI) indicators of drought tolerance showed that GSI can be considered as an early selection criterion for drought tolerance.
  L. Zarei , E. Farshadfar , R. Haghparast , R. Rajabi and M. Mohammadi Sarab Badieh
  The objective of this study was to evaluate the ability of several selection indices to identify drought resistant cultivars under field and laboratory conditions in Kermanshah, Iran. Twenty bread wheat genotypes differing in yield performances were evaluated using a RCBD design with three replications under two different environments (irrigated and rein-fed) during 2004-2005 growing season. Grain yield of the genotype in the both conditions, Stress Tolerance Index (STI), was calculated for each genotype. Moreover Proline amino acid concentration (PC) in flag leaf of each genotype was also measured in grain filling stage in the stressed condition. Cell Membrane Stability (CMS) of leaf tissues in seedling stage was calculated for each genotype grown in the pots in greenhouse. Germination Stress Index (GSI), coleoptile length and root length, number of roots, Promptness Index in Stress (PIS) and non-stress (PINS) condition were recorded in the controlled condition of laboratory by using a 2x20 factorial experiment within completely randomized design with three replications under two different stress and non-stress (normal) water regimes. The result of analysis of variance exhibited highly significant difference among the genotypes for the most of the traits. Drought stress induced by PEG (polyethylene glycol) decreased all of the traits. Root length was the most sensitive to drought stress. Correlation analysis indicated strong association between STI and CMS and PC. It was inferred from the study that the greater drought tolerance corresponded to the greater cell membrane stability and proline accumulation. Also, highly significant correlation was observed between GSI, STI and PIS. The results imply that these criteria may be screened for indirect selection of drought tolerance in the initial stages of the bread wheat growth.
  S.F. Hossaini , R. Haghparast , N. Bahrami and Y. Haghi
  To study the response of advanced wheat genotypes to sunn pest, a research was conducted under free and non-free selection for sun pest attack, using a randomized complete block design with 5 replications and 25 genotypes including, 19 advanced bread wheat, 4 durum wheat and 2 checks (Sardari and Azar-2). These genotypes were evaluated in Dryland Agricultural Research Sub-Institute, Kermanshah, Iran during 2007-2008. To identify tolerant genotypes to sunn pest we used SPTI (Sunn pest tolerance index). Significant difference were observed between genotypes for number of damaged central bud, number of adult sunn pest, number of new generation sunn pest, percent of damaged seed, grain yield and thousand seed weight. Based on mean ranks of SPTI, number of damaged central buds and percentage of damaged seeds, PATO1 was the most tolerant genotype and among durum wheat genotype Pgs was the best genotype. This result indicated selection based on grain yield is better than thousand seed weight. Sunn pest tolerance index is an index related to grain yield and it is a new good index for genotype selection. We purpose this index for new experiments.
 
 
 
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