Fig. 4: Histological observation of the ‘Dangshansuli’ pear pericarps and ovules.

a, d, g Ovule transversal sections at 14 DAA in unpollination, pollination and GA4+7 treated fruits. b, c, e, f, h, i Pericarp transversal sections at 14 DAA in unpollination, pollination and GA4+7 75 mg L−1 treated fruits, respectively, and the respective of pericarp thickness (j) and cell layers (k). EM, external mesocarp; IM, internal mesocarp; VB, vascular bundle; LO, locule; OV, ovule. UP, Unpollination; P, Pollination; GA4+7, GA4+7 75 mg L−1. Significant differences (P < 0.05) between treatments are showed by different letters according to Duncan’s test. Bar = 200 μm