The effect of vascular system of rachis on yield components of barley var. Reyhan

This experiment was carried out in order to investigate the effects of transferring vascular system on components of yield in the main axis of Reyhan spike. This experiment was done in the research farm of Islamic Azad University Saveh Branch in 1388-89. In this study the size and distribution of vascular bundles and their effects on yield components of barley were examined. The results showed that the number and size of central vascular bundles decreased along the axis from proximal to distal part of spike as the highest level of decreasing was in the proximal part of spike in comparison to other parts of spike. This experiment revealed that there was no relationship between decreasing of size and number of vascular bundles and the weight of grains along barley axis. The greatest number and size of vascular bundles (internodes No: 1 to No: 3) detected in the beginning of spike axis. The results showed that all the number of vascular bundles in peduncle of spike was not entering to the spike axis in all the samples with equal number of spikelet. But the number of vascular bundles in this experiment that were entering to the rachis from peduncle side of spike is equaled in all the samples.