Vol. 9, Issue 6 (2020)

Author(s):
D Dev Kumar, D Vishnu Vardhan Reddy, P Raghuveer Rao, M Sheshu Madhav, V Gouri Shankar and B Vishalakshi

Abstract:
Rice (Oryza sativa L.) is the most important staple food crops in the world. In Asia, more than two billion people are getting 60-70 per cent of their energy requirement from rice and its derived products. Samba Mahsuri (BPT-5204) is premium quality aromatic and light weight rice. Due to its excellent grain character, variety being regularly used in hybridization programmes to meet current breeding objectives. Therefore, use of advanced breeding lines generated from BPT-5204 would only be appropriate and evaluation of available germplasm or mutants for various physiological and yield attributes is essential. It was proposed to characterize the advanced EMS mutated lines for their important morphological, physiological, yield attributing traits, grain characteristics as compared to the wild type (untreated Samba Mahsuri). The experimental field was laid in RBD replicated thrice with 30 high yielding rice genotypes which includes 26 advanced breeding lines (ABL) and four checks. Morphological parameters were measured at periodical intervals. Plant height among genotypes ranged from 92 to 131cm. Genotype, SP-70 (126 cm) showed maximum plant height and followed by SP-355 (124 cm) compared BPT-5204 (98 cm). Mean plant height increased by 44.3% from active tillering to panicle initiation stage and then by 28.4% from PI to physiological maturity. Higher number of tillers per plant was observed in SP-08 and SP-70 (23) compared to check BPT-5204 (18). Among the duration groups, the short duration (116 to 122 days) lines were SP-08, SP-72, SP-70 and SP-69. The medium duration (125 to 133 days) lines, SP-351, SP-353, SP-355, SP-357, SP-80 and SP-25 and long duration (140 to 148 days) lines, SP-02, SP-03 and SP-37 found superior in terms of grain yield as compared to their respective check varieties. Two advanced breeding lines namely SP-08 and SP-70 can be further probed thoroughly for further increasing in yield and yield attributes.