Non-disappearance of anthocyanin in differentiating guard cells
The present study contradicts the observations of Laloraya (1970) about the disappearance of betacyanin or anthocyanin on the differentiation of guard cells from guard cell mother cells accompanied with the appearance of chloroplast pigments in the guard cells. Repeated observations on developing stomata ofCelosia, Coleus andEranthemum show that betacyanin or anthocyanin persists in the guard cells even after their maturation and the appearance of chloroplasts in them. Betacyanin does disappear in the guard cells of the cotyledonary stomata ofCelosia but long after their maturation and the appearance of chloroplasts in them. Anthocyanin is absent in the guard cell mother cells ofCodiaeum, Rhoeo andSetcreasea and in these plants the pigment neither appears nor disappears at any stage of development from the mature guard cells. The ontogeny of the stomata in all these plants is also described.