Figure 8. SEM observation of P. sylvestris var. mongolica under different drought stress (CK, MD, and HD in each column from left to right).

(A–C) starch granule morphology in needles; (D–F) needle epidermis morphology; (G–I) stomatal morphology of needles; (J–L) transverse anatomical structure of root; (M–O) transverse anatomical structure of stem; (P–R) anatomical structure of needle transverse section).