Grain yield of wheat is dependent on grain weight, which is the result of grain filling duration and rate. The study was undertaken to examine the relation between grain weight and rate and duration of grain filling in five high-yielding NS wheat cultivars. Stepwise multivariate analysis of nonlinear regression estimated grain filling parameters was used to examine cultivar differences in grain filling. On the basis of three-year average, the highest grain dry weight had cultivar Renesansa, and the lightest grains were measured for cultivar Evropa 90. Stepwise multivariate analysis indicated that all three nonlinear regression estimated parameters (grain weight, rate and duration of grain filling) were equally important in characterizing the grain filling curves of the cultivars studied, although sequence of their significance varied in different years, which is probably caused by different environmental conditions in three years of experiment
Microsatellite markers (SSR) were used to study wheat genetic diversity. A
set of 87 wheat genotypes was analysed with four SSR markers. Primers used
for the amplification of adequate microsatellite loci (Xgwm) are according to
R?DER et al. (2002). Results were obtained using Applied Biosystems 3130
genetic analyser. Total of 28 alleles were determined, i.e. average of 7
alleles per marker. Number of alleles for individual markers ranged from six
(Xgwm3) to eight (Xgwm18). The presence of two null alleles for Xgwm18 and
Xgwm155 was found. There were five rare alleles (frequency <2%). Polymorphism
information content (PIC) values ranged from 0.52 for Xgwm408 to 0.80 for
Xgwm18. Mean PIC value was 0.69 for all markers, which signifies a high level
of the detected polymorphism. According to the data collected through the
analysis of four markers, most genotypes can be grouped in clusters. The
results show usefulness of microsatellite markers in detecting polymorphism,
identifying genotypes and assessing genetic diversity. [Projekat Ministarstva
nauke Republike Srbije, br. TR31066]
Grain yield of wheat (Triticum aestivum L.) is influenced by number of grains per unit area and grain weight, which is result of grain filling duration and rate. The aim of the study was to investigate the relationships between grain filling parameters in 4 wheat genotypes of different earliness and yield components. Nonlinear regression estimated and observed parameters were analyzed. Rang of estimated parameters corresponds to rang of observed parameters. Stepwise MANOVA indicated that the final grain dry weight, rate and duration of grain filling were important parameters in differentiating among cultivars grain filling curves. The yield was positively correlated with number of grains/m2, grain weight and grain filling rate, and negatively correlated with grain filling duration. Correlation between grain weight and rate of grain filling was positive. Grain filling duration was negatively correlated with grain filling rate and number of grains/m2. The highest yield on three year average had medium late Mironovska 808, by the highest grain weight and grain filling rate and optimal number of grains/2 and grain filling duration
Breeding new line pepper genotypes is an important goal for the Institute for Vegetable Crops, Smederevska Palanka. Years of selection resulted in great number of varieties, however, the selection of F1 pepper hybrids started recently. Pepper F1 hybrids have proved to be better than cultivars in the terms of earliness, yield, plant uniformity, pathogen resistance etc. Considering significant heterosis values for earliness, this paper deals with the genetic analysis of F1 and F2 pepper hybrids, obtained by crossing four lines, including ms line HM-6
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