Study on response of advanced wheat lines to wheat stem sawfly in dryland condition.
2008
Bahrami, Nuzar | Haq Parast, Reza | Darya`ei, Amir
In order to investigate the response of advanced bread and durum wheat genotypes to sawfly and determining relationship between measured characteristics, an experiment with 25 genotypes was conducted based on randomized complete block design (RCBD) with 4 replications under rain-fed condition at Sararood Research Station during two cropping seasons (2005 and 2006). Each plot consisted of 4 rows with 30 cm apart and 4 m lenght. The genotypes were evaluated to resistance test in different stages during each cropping season. The studied traits included stem diameter, stem wall thickness, number of node, distance between nodes, number of infected spike, infection percentage, infected and non-infected kernel weight, plant height. The maximum infestation (23%) was observed for genotype NWT/3/TAST/SPRW//TAW12, whereas the least was obserevd for the genotypes i.e., Ardabil 82–118, Ghods*3/Kavvko //Ghods*3/k and syrin-4 with 0.2, 2.7 and 3.2%, respectively. In conclution, 8 out of 25 genotypes with 1-5 % of infestation were resistant. The results of correlation analysis showed significantly negative correlation between infection percentage and number of nodes, indicating the genotypes with more number of nodes are resistant. Also, significat negative correlation found between plant height and stem wall thickness showed that the genotypes with less plant height are having more stem wall thichness.
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