Fig. 3

Morphological observation, cell counting and length measurement of NAT disc floret and AT disc floret. A. Observation areas of the top, middle, and basal region of NAT disc floret and AT disc floret at blooming stage. Scale bar = 5 mm. B. SEM observation of the cell morphology of the top, middle, and basal of NAT disc floret and AT disc floret. Scale Bar = 100 μm. C. Cell counting in different parts of the two types of florets. (t-test, n ≥ 15 P < 0.05) D. Measurement of cell lengths. Values are presented as the mean ± SE. (t-test, n ≥ 25, P < 0.05). E. Histology of petals from NAT disc floret and AT disc floret. longitudinal sections of disc floret from the top, middle and basal parts of stage 1, stage 3, and stage 5 were observed. Ad: Adaxial side Ab: Abaxial side ML: mesophyll layer cells. Scale Bar = 10 μm