**Department of Botany, University of Delhi.
Division of Horticulture and Fruit Technology, Indian Agricultural Research Institute, New Delhi.
*A part of thesis submitted by the senior author for M. Sc. degree in Horticulture of the Post Graduate School, Indian Agriculture Research Institute, New Delhi.
Studies on the morphological aspects of growth of the mango fruit and seed have shown that sigmoid growth pattern is characteristic for both, when their growth is measured in terms of length, breadth, thickness, weight and volume and is plotted against days from anthesis. Highest percentage increase in growth of fruit and seed is found in April followed by May in both the cultivars—Dashehari and Chausa. Thus the growth of the fruit is directly associated with the growth of the seed. Cell division in the outer and inner epidermis continues for a longer period but in exocarp region it stops 5 weeks after anthesis in Dashehari and 6 weeks after anthesis, in Chausa. In mesocarp region it, however, extends up to 6 weeks in Dashehari and up to 7 weeks in Chausa from anthesis. Seed development promotes the growth of the fruit by its own development. The slowing down of growth after 64 days from anthesis in Dashehari and after 79 days from anthesis in Chausa is associated with the hardening of endocarp and slowing down of seed growth.
