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The morphology of stems in spring growth (11–18 June) and regrowth (16 July and 6–13 August) at different developmental stages of the apex. A1 to A2 refer to the vegetative stage, A3 to A4 to the transition stage and A5 and more to reproductive stages of apexes. Stem samples of three individual tillers of the indicated apex stage were used for anatomical studies; n = 3 replicate stem sections per apex stage and sampling time. Scale bars = 200 µm in each photomicrograph.
