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Impact of introduction of modern varieties on crop diversity.

John R. Witcombe, K.D. Joshi, Daljit Singh Virk, Bhuwon Ratna Sthapit

Abstract

This chapter reviews the impact of modern varieties on crop diversity through three detailed case studies on rice: (i) cultivar replacement in high-altitude rice in Nepal; (ii) cultivar replacement in upland rice in eastern India; and (iii) client-oriented breeding in low-altitude areas of Nepal. It concludes with a discussion of the impact on varietal diversity of these successes in improving local food security.

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Key concepts: Diversity (politics), Cultivar, Crop, Altitude (triangle), Geography, Food security, Crop diversity, Agronomy