Anatomical characteristics of the uppermost internode of winter wheat genotypes differing in stem length

amande de la graine contenido de materia seca cultivos de invierno culture d'hiver dry matter content espigas essai faisceau vasculaire floema genotipos genotypes germen haces vasculares kernels measurement mesure phloem pruebas spikes stems tallo tige trials triticum aestivum vascular bundles winter crops