OAR@ICRISATEvaluation of groundnut core collection to identify sources of tolerance to low temperature at germinationH DUpadhyayaauthorS NNigamauthorSSinghauthorGroundnut {Arachis hypogaea L,) is an important oilseed crop cultivated in about 96 countries of the world. In the year 2000, it was cultivated on 23.84 million hectares with 34.52 million tonnes output of groundnut in shell. Arachis hypogaea is divided into two subspecies, fastigiata and hypogaea. The subspecies fastigiaia is subdivided into four botanical varieties, fastigiata, peruviana, aequatoriana, and vulgaris and subspecies hypogaea into two botanical varieties, hypogaea and hirsuta. The crop is grown under wide range of climatic conditions, from warm tropical to humid temperate, although all the production environments can be characterized by a warm, frost-free period of at least 90 days (Bunting etal. 1985). During this growing season, mean temperatures generally range from 24 to 33°C (Saxena et al. 1983), with temperature optima for growth and dry matter production generally considered to lie within a similar range (Ketring et al. 1982; Ketring, 1984). The base temperature (Tb), the temperature at or below which the rate of progress towards a phenological event is zero, for groundnut is considered to be 10°C. Bell et ah (1991) estimated mean Tb for 16 cultivars for germination to be 13.3°G In some countries in Asia and North America, the temperatures at planting time are low resulting in delayed and poor germination/plant stand in groundnut and consequently poor yield and economic loss to the farmers. The objective of the study was to determine genetic variation and identify sources for low temperature (12°C) tolerance at germination in the core collection of groundnut.Groundnut2001Article

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