Quantitative characteristics of the conducting system in stem of winter wheat genotypes with spike fertility genes

amande de la graine cultivos de invierno culture d'hiver espiguilla essai faisceau vasculaire floema gene genes genetic resources genotipos genotypes germen haces vasculares kernels measurement mesure phloem pruebas spikelets stems tallo tejido vascular tige tissu vasculaire trials triticum aestivum vascular bundles vascular tissues winter crops