Vol. 8 (5) : September-October 2017 issue
Green Farming Vol. 8 (5) : 1029-1033 ; September-October, 2017
Studies on heterosis for yield and its component traits in rice (Oryza sativa L.)
K. SUDEEPTHIa1*, JYOTHULA D.P.B.a2, Y. SUNEETHAa3 and V. SRINIVASA RAOb4
aDepartment of Genetics and Plant Breeding, bDepartment of Statistics and Mathematics Agricultural College Bapatla, ANGRAU, Bapatla - 522 101 (Andhra Pradesh)
1Ph.D. Scholar *(email@example.com), 2Asstt. Professor, 3Scientist, 4Professor & University Head
Subject : Crop genetics & Plant breeding
Paper No. : P-6912
Total Pages : 5
Received : 12 July 2017
Revised accepted : 28 August 2017
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K. SUDEEPTHI, JYOTHULA D.P.B., Y. SUNEETHA and V. SRINIVASA RAO. 2017. Studies on heterosis for yield and its component traits in rice (Oryza sativa L.). Green Farming Vol. 8 (5) : 1029-1033 ; September-October, 2017
An investigation was carried out to assess the heterosis for yield and yield contributing traits of rice. Twenty one (21) cross combinations were obtained by crossing 3 Cytoplamic male sterile (CMS) lines with 7 testers in line x tester mating design. The high magnitude of heterosis for grain yield per plant is evident by significant superiority of crosses over mid parent and standard hybrid check (DRRH2). Results indicated that the highest positive significant heterosis was exhibited by the cross IR 58025A x NLR 33057 (86.13%) for relative heterosis and by cross IR 68897A x NLR 33654 (59.44%) for standard heterosis for grain yield per plant. None of the hybrids showed positive significant heterobeltiosis for grain yield per plant. It was concluded that superior heterosis for grain yield was due to increased productive tillers per plant, number of filled grains per panicle and test weight.
Key words :
Line x tester, Oryza sativa, Rice, Standard heterosis.