Organization of Shoot Apex during the Ontogeny of Brassica campestris L.

Abstract

OUR knowledge of the organization of shoot apices is confined mostly to mature plants, and there has been very little work on the ontogenetic changes occurring in them¹. Certain interesting observations on the above topic came to light during a comparative anatomical study of vernalized and control plants² of mustard. Microtome sections of: (1) seeds soaked for six hours in water; (2) seedlings collected at intervals of twenty-four hours up to seven days and then on the ninth day; and (3) vegetative and reproductive apices formed fifteen and twenty-nine days after sowing were cut 13 µ thick and stained with hæmatoxylin and safranin.