Multi-environment evaluation of Spanish bunch groundnut genotypes for fresh seed dormancy Kumar Narendra*, Ajay B. C., Dagla M. C.1, Rathnakumar A. L., Radhakrishnan T., Lal C.2, Samdur M. Y., Mathur R. K.4, Manivel P.5 ICAR-Directorate of Groundnut Research, Ivnagar Road, P. B. No. 5, Junagadh, 362 001, Gujarat 1ICAR-Indian Institute of Maize Research, PAU Campus, Ludhiana, 141 004 2ICAR-Indian Institute of Wheat & Barley Research, P.B. No. 158, Karnal, 132 001 3Centre on Rabi Sorghum (ICAR-Indian Institute of Millets Research), Solapur, 413 006, Maharashtra 4ICAR-Indian Institute of Oil Palm Research, Pedavegi, 534 450 5ICAR-Directorate of Medicinal and Aromatic Plants Research, Anand, 387 310 *Corresponding author's e-mail: narendrapb09@gmail.com
Online published on 14 November, 2019. Abstract The present study was carried out to evaluate eight promising Spanish bunch groundnut genotypes during four consecutive years (2014, 2015, 2016, 2017) to study genotype × environmental interactions and to identify stable sources of fresh seed dormancy in Spanish background in groundnut. Pooled analysis of variance revealed highly significant differences among the genotypes and genotype × environmental interactions for fresh seed dormancy at weekly intervals indicating that differential behavior of genotypes for fresh seed dormancy over the environmental conditions. Based on the results of intensity and duration of dormancy and germination stability index, identified four stable advanced breeding lines viz., PBS 12192, PBS 12187, PBS 12191 and PBS 12190 having high fresh seed dormancy of three week and two stable advanced breeding lines viz., PBS 12189 and PBS 12171 having high fresh seed dormancy of two week. Therefore, these genotypes can be used as novel genetic stock of fresh seed dormancy in Spanish bunch and they can be integrated into breeding programs to develop high yielding Spanish bunch cultivars with 2–3 weeks of fresh seed dormancy to avoid yield losses due to in-situ germination at the time of crop maturity. Top Keywords Groundnut, Spanish bunch, fresh seeddormancy, stability, germination stability index. Top |