Study of heterosis by utilising cytoplasmic-genetic male sterility system in rice (Oryza sativa L.)

Soni, D.K.; Arvind Kumar; Sunil Nag; Lakeswar Sahu

Plant Archives 5(2): 617-621

2005


Accession: 004477229

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Abstract
Hybrids using 3 cytoplasmic male sterile (CMS) lines (IR 58025A, IR 68886A and IR 68888A) and 6 testers (Aditya, Danteshwari, IR 64, Nidhi, Ratna and MTU 1010) suited to Chhattisgarh (Madhya Pradesh, India) irrigated situation were evaluated for heterosis. Two hybrids, i.e. IR 58025A/Danteswari and IR 68888A/IR 64, showed high positive hybrid vigour over the standard control IR 64, high positive specific combining ability effect and per se performance for seed yield and associated characters. Heterosis for seed yield was due to the positive and significant heterosis for components such as productive tillers per plant, panicle length and spikelet fertility percentage for IR 68888A/IR 64 and spikelet density for IR 58025A/Danteswari. Danteswari and Ratna were identified as effective restorers for CMS lines IR 58025A and IR 64, respectively. No effective maintainer was found.