Genetic variabitity for fresh seed dormancy in Spanish bunch advanced breeding lines of groundnut (Aruchis hypogaea L.)

Abstract

A study was carried out to identify genotypes possessing fresh seed dormancy in Spanish bunch genetic background. Analysis of variance revealed highly significant differences among the genotypes for fresh seed dormancy at all the stages. Among the three parameters of fresh seed dormancy, only intensity of fresh seed dormancy at weekly interval instead of only at 7 days after sowing was found very important parameter to identify ideal sources of fresh seed dormancy in Spanish types. Two years results revealed that seven genotypes viz., PBS 12190, PBS 12191, PBS 12192, PBS 12171, PBS 12187, PBS 12189 and TPG 41 were the best genotypes which recorded average more than 90% intensity of fresh seed dormancy for 21 days and these also had 100% fresh seed dormancy at 7 DAS except PBS 12191, PBS 12171 and PBS-12189. However three genotypes PBS 12200, PBS 12200B and PBS 12201 also had more than 90% fresh seed dormancy for 14 days. Therefore, these genotypes were identified as new sources of fresh seed dormancy with high intensity and high degree of fresh seed dormancy for over 2-3 weeks. These genotypes could be used as donor parents in breeding programmes to develop high yielding Spanish bunch varieties with 3-4 week fresh seed dormancy in groundnut.