Experiments conducted from 2007 to 2009 evaluated germination of 11 peanut runner-type cultivars. Germination was evaluated in Petridishes incubated over a thermal gradient ranging from 14 to 30Ã?°C at 1.0?C increments. Beginning 24?hr after seeding, peanut was counted as germinated when radicles were greater than 5?mm long, with removal each day. Germination was counted daily for seven days after seeding. Growing-degree day (GDD) accumulation for each temperature increment was calculated based on daily mean temperature for that Petri dish. Two indices were obtained from a logistic growth curve used to elucidate seed germination by cultivar: (1) maximum indices of germination and (2) GDD value at 80% germination (Germ80), an indication of seed vigor the lower the Germ80 value, the greater the seed lot vigor. Based on the two indices, seed lots ââ?¬Å?AT 3081Rââ?¬Â, ââ?¬Å?AP-3ââ?¬Â, ââ?¬Å?GA-06Gââ?¬Â, and ââ?¬Å?Carverââ?¬Â had the strongest seed vigor (Germ80 26 to 47 GDD) and a high maximum incidence of germination rate (80 to 94%). Seed lots of ââ?¬Å?C99-Rââ?¬Â, ââ?¬Å?Georgia-01Rââ?¬Â, ââ?¬Å?Georgia-02Cââ?¬Â, and ââ?¬Å?Georgia-03Lââ?¬Â had inconsistent seed performance, failing to achieve 80% germination in at least two of three years.
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