Fig. 4

Phenotypic and microscopic observation of S. polyrrhiza 7498 plants. Phenotypic and microscopic observation were conducted on the 8th day of the experiments. Plants cultivated on medium without (a, c, e, g and h) or with 75 µg/ml MH (b, d, f, i and j) were collected at about 4 pm in the day time for observation with a dissecting microscope (a and b), for frond mesophyll cell observation with TEM (c and d) and frond stomatal observation with SEM (g to j). Paraffin slices of fronds were stained by Safranin and Fast Green and observed with light microscope (e and f). MC indicates mesophyll cell and BSC indicates bundle sheath cell