1) The process of digestion of starch grains in the growing stigma of
Lilium longiflorum Thunb. was observed and shown in Fig. 1.
2) In the immature stigma of
Lilium, Antirrhinum, Gladiolus and
Hibiscus storage starch grains were found abundantly, but with the progress of maturation the starch grains disappeared.
3) Sugars in the stigma of
Lilium and some other flowers were investigated by means of paperchromatography. Sucrose, glucose and fructose were found to exist in the respective stigmas (Figs. 2, 3).
4) By the addition of stigma juice of
Lilium to the solution of soluble starch, maltose, glucose and some other sugars were regularly detected, while the color of iodine reaction of this solution turned into yellow brown from blue (Fig. 5). It may be said that tissues of stigma contain some amylase.
5) The localization of amylase in stigma was histochemically investigated. The presence of amylase was demonstrated in all parts of the stigma tissue except vascular tissue, and the activity of the enzymes was found to be highest in the tiptissue and inductive tissue (Fig. 4).
6) The tissues of mature stigma of
Lilium have an activity to produce starch grains from Cori-ester. It may be said that there exists some phosphorylase in these tissues.
7) In the mature pollen starch grains are deposited before germination when they are incubated on the sugar media, while germinating pollen which had been freed of starch grain was not found (Fig. 6).
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