Fig. 4

Morphological map of near-isogenic male fertile lines (MF) and near-isogenic male sterile lines (MS) of S. miltiorrhiza leaves. a Male sterile leaf, b male fertile leaf, c chloroplast subcellular structure of male sterile leaf and d chloroplast subcellular structure of male fertile leaf. The blue lines indicate the thylakoid and spindle shape, respectively. The scale bar of each figure was indicated in the lower right corner