Showing 3 results for Yazdi-Samadi
N. Majnoun Hosseini, R. H. Ellis, B. Yazdi-Samadi,
Volume 3, Issue 2 (Number 2 - 2001)
Abstract
A field study was conducted to evaluate the agronomic response of eight isolines of cv.
Clark on a clay loam soil (at Karaj-Iran, 35048´) to four plant population densities of 11.3,
18.5, 68.5, and 103.4 plants per square metre. Significant yield increase was obtained as a
result of higher plant density. Differences among the cv. Clark isolines were significant
(p<0.05). Yield components such as numbers of branches, pods, and seeds per plant decreased
linearly as population density increased. Adjustments in pods and seeds per plant
resulted from altered branches per plant. The isolines which exhibit profuse branching
(e.g. E1E2E3, E1e2E3, E1E2 e3) were capable of optimising yield when planted at low densities.
The second dynamic factor that aided yield compensation by plant population density
was greater total dry matter partitioning, which resulted in a significantly greater harvest
index at the lower compared with the higher plant density. The results indicated that total
biomass and crop growth rate were the major elements explaining the reduced yield compensation
factors at higher plant population density. Plotting the fitted seed yield values
against the number of dominant alleles showed the effect of the maturity genes on the response
of seed yield to plant density.
M. R. Naghavi, M. R. Bihamta, B. Yazdi-Samadi, N. B. Jelodar, M. R. Davey, E. C. Cocking,
Volume 4, Issue 3 (Number 3&4 - 2002)
Abstract
Two barley (Hordeun vulgare L.) genotypes, Radical and Cwb, with good to moderate levels of resistance to powdery mildew were crossed with a highly susceptible cultivar (Afzal) to determine the genetics of resistance. The parents, Fl, F2 and F3 generations of each of the two crosses, were evaluated for powdery mildew resistance in the glasshouse and field at the College of Agriculture in Karaj during 2000. The x2 analysis of the segre-gating ratios in the F3 generations indicated that the resistance was controlled by one gene at seedling stage and by two or three genes at adult plant stage in Cwb and Radical, respectively. Radical showed a higher level of resistance than the Cwb, therefore, it is a better source of resistance to powdery mildew.
H. Samizadeh, B. Yazdi-Samadi, M. R. Bihamta, A. Taleii, G. R. Stringam,
Volume 9, Issue 2 (Number 2 - 2007)
Abstract
Pod length is one of the effective components on canola yield selection on the basis of which can increase not only the seed yield but also the oil yield. Molecular markers asso-ciated with long pod loci were identified in a doubled haploid population derived from a cross between the canola lines ‘Quantum’ (long pod) ‘China A’ (short pod) using RAPD and bulked segregant analysis. A molecular marker linkage map of 37 loci for this popu-lation was used to identify quantitative trait loci (QTL) controlling pod length of which two markers in two unlinked loci were selected by using an interval mapping model which explained 22% of phenotypic variation for pod length in this population. Selection for markers at two loci for increasing pod length resulted in a group of doubled haploid lines with an average 112 mm pod length that increased 15% of whole population mean. This shows that using these markers in the breeding program will enhance the breeding of long pod canola varieties.
