PRELIMINARY-STUDY OF PEAR FRUIT BOURSE - ANATOMICAL STRUCTURE AND HISTOLOGICAL EVOLUTION OF STARCH STORAGE

Fruit bourse of Malaceae results from thickning of the lower part of i nflorescence axis when fruits are set. This study primary describes st ructural evolution of this organ in relationship with its productions : fruit, buds, vegetative and flowering shoots. In the bourse, it appe ars a significant development of parenchyma structures particularly co rtical parenchyma and a high cambial activity with regard to lower axi s. Starch distribution in the bourse is not regular and seems to devel op with growing centers of this organ.