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Semidwarf barley cultivars have been created in the past decades featuring shortened straw length. The semidwarfness trait is desirable because plants with reduced height are more resistant to lodging and, as a consequence, have an improved harvest index. Accordingly, both breeding and molecular mapping experiments were undertaken to enhance and evaluate the performance of semidwarf barley lines. To study the morpho-anatomical effects of the denso locus twenty barley lines developed by single seed descent technique were analysed. We measured several macro and microscopic traits of aboveground organs. We detected reduction in leaf size, which at tillering stage was also reflected by smaller sizes of some, but not all, categories of epidermal cells. Lower cell division frequencies were deduced for cell files with unchanged cell lengths. Denso leaf blades were thinner and had smaller vascular bundles and narrower tracheal elements compared to the wild type. On the other hand, a lack of effect was noted e.g. for sizes of stomata and size of spike. Denso gene thus exerted a multilevel dwarfing effect on cells, tissues and organs although not all organs and cells were affected to the same extent, and cell size or division frequency were modified depending on cell type.

The effect of the denso dwarfing gene on morpho-anatomical characters in barley recombinant inbred lines