The effect of photoperiod on internodal anatomy of Glycine max L.
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"Stem development is characterized by an apical meristem that produces leaf and bud primordia before cellular differentiation and thus gives rise directly not only to the tissues differentiating immediately below it but also to all subsequent tissues, organs and meristems of the shoot. This apical meristem is composed of a mass of cells undergoing cell division only, underlaid by a mass of cells that are not only dividing, but beginning elongation and differentiation (27). In general, stem development consists of the development of the separate nodes and internodes. As elongation and differentiation progress, the pairs of leaf and bud primordia are gradually separated by developing internodes. This is the case in all but acaulescent plants and some mutated dwarfs. The meristem gives rise directly to the protoderm, the procambium and the ground meristem. Of these three tissues, the procambium is often the first to differentiate into distinct cell types (30). At about the time the procambium begins differentiation, the internode is undergoing elongation due to both cell division and cell elongation, primarily in the ground meristem."--Introduction.
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