DESCRIPTION OF COURSES

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SST 601 HYBRID SEED PRODUCTION                                                                               (2L + 2P) I

Objective
To provide a comprehensive knowledge and practical exposure to hybrid seed production in field crops and vegetables.

Theory

UNIT I
Heterosis: definition, expression and estimation of  hybrid vigour; utilization of  heterosis in agricultural, horticultural and other crop plants for crop improvement.

UNIT II
Pre requisites for hybrid seed production; mechanisms and management of  pollination in autogamous and allogamous crops; genetic constitution of varieties, hybrids and basic principles in seed production.

UNIT III
Techniques of hybrid seed production - emasculation and crossing: use of self-incompatibility, modification of sex; types of male sterility and exploitation in hybrid development and its use in hybrid seed production; development and maintenance of A, B and R lines.

UNIT IV
Fertility restoration; use of chemical hybridizing agents, problems of non synchrony in flowering of parental lines and methods to overcome; planting ratios and population density in relation to hybrid seed yield; salient features of hybrid seed production of various crops viz., rice, sorghum, bajra, maize, sunflower, cotton and other major vegetables.

Practicals
Methods of hybrid seed production in major agricultural and horticultural crops; planting of rows / blocks of parental lines and manipulations for achieving flowering synchrony for production of hybrid seeds, maintenance of A, B and R lines and production of breeder seed; stable diagnostic characteristics of parental lines and their hybrids; genetic purity tests; determination of cost of hybrid seed production of various crops; visit to seed production plots etc.
(Pre-requisite: SST 502)

Suggested Readings