DESCRIPTION OF COURSES

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SST 501 FLORAL BIOLOGY, SEED DEVELOPMENT & MATURATION                                                                               (2L+1P) I

Objective
To refresh the basic knowledge of seed development and structures and apprise students with its relevance to production of quality seed.

Theory

UNIT I
Floral types, structure and biology in relation to pollination mechanisms; sporogenesis: micro- sporogenesis and mega-sporogenesis; micro and mega gametogenesis - development of male and female gametes and their structures; effect of environmental factors on floral biology.

UNIT II
Fertilization – embryo sac structure, process, barriers to fertilization, incompatibility and male sterility, factors affecting fertilization.

UNIT III
Embryogenesis - development of typical monocot and dicot embryos; endosperm development, modification of food storage structures with reference to crop plants; different types of embryos, endosperm and cotyledons; development and their structure in representative crop plants with reference to food storage; external and internal features of monocot and dicot seed; seed coat structure and development in representative crop plants.

UNIT IV
Apomixis – identification, classification, significance and its utilization in different crops for hybrid seed production; Polyembryony - types and significance; haplontic and diplontic sterility, causes of embryo abortion, embryo rescue and synthetic seeds.

Practicals
Study of floral biology of monocots and dicots; micro-sporogenesis and mega-sporogenesis; study of pollen grains - pollen morphology, pollen germination and pollen sterility; types monocot and dicot embryos; external and internal structures of monocot and dicot seeds; seed coat structure, preparation of seed albums and identification.

Suggested Readings