Abstract
Genotypic variation of spikes’ related traits was assessed using a sample of durum wheat lines. A simple lattice experiment was carried out using 58 exotic promising lines and 6 landraces of two years cropping seasons (2006/2007 and 2007/2008) at the Agriculture Research Station of Islamic Azad University, Tabriz Branch, Iran. Plant height, peduncle length, number of node per stem, number of spikes per plant, spike length, number of grain per spike, 1000­ grain weight, and grain yield were measured. Combined analysis of data for two years showed that interaction of lines × year was not significant for any of the traits. This indicates that responses of traits were identical in both years. There were also significant differences for all traits among the lines, and there was genotypic variation for these traits among durum wheat lines. Mean comparisons of grain yield showed that exotic promising lines: ARAMIDES (no.33), LC/RD (no.55) and landraces lines: YAZLIG (no.62) and YAZLIG (no.64) had the highest yield than the other lines. Estimate of correlation between traits indicates that there was significant and positive correlation between grain yield and traits such as number of spikes per plant, spike length and grain per spike. Regression and path analysis showed that the traits such as number of grain per spike, spikes per plant and spike length had positive and direct effect on yield. Key words: Combined analysis, correlation, regression, Triticum durum.
Highlights
Genetic diversity is a valuable tool for plant breeding and screening promising genotypes (Spagnoletti and Qualset, 1987; Souza and Sorrells, 1991; Hammer et al, 2003)
Mean comparisons of grain yield showed that exotic promising lines: ARAMIDES, LC/RD and landraces lines: YAZLIG and YAZLIG had the highest yield than the other lines
Regression and path analysis showed that the traits such as number of grain per spike, spikes per plant and spike length had positive and direct effect on yield
Summary
Genetic diversity is a valuable tool for plant breeding and screening promising genotypes (Spagnoletti and Qualset, 1987; Souza and Sorrells, 1991; Hammer et al, 2003). Available genetic variability in landraces genotype is useful and useable for breeding purposes (Roy, 2000). Pathak and Nema (1985) in their study on some wheat landraces in India obtained genetic variations for yield, yield components and other traits such as plant height, number of spikelet per spike, fertile tiller, spike length, heading date, 1000 grain weight, grain weight per spike and grain yield per plant. Okuyama et al (2005) reported genetic variations for spike related traits. Several researchers have reported genetic variations for traits in studying wheat genotypes (Van Beuningen et al, 1997; Wang et al, 2002; Blake et al, 2007). Bilgin et al (2008) reported that grain yield depended on 1000 grain weight, grain per spike and agro-ecological conditions during the growing period. Information of variability is important in enhancing the efficiency of selection
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