Variability in performance among mature half-sib progenies of Hevea brasiliensis (Willd ex Adr. de Juss. muell. Arg.)
2010
Mydin, K.K. | Thomas, Vinoth | Mercykutty, V.C.
A study on half-sib progeny testing and selection was undertaken at the Central Experiment Station of the Rubber Research Institute of India during 1993-2004 to evolve new and improved rubber clones of varying parentage. A total of 15,0 rubber clones comprising open pollinated progenies often popular clones, with IS clones per progeny were evaluated in a Compact Family Block Design over four years of tapping. There was significant variability among and within the mature progenies with respect to rubber yield, growth attributes, timber yield and bark anatomical parameters. Based on estimates ofgeneral combining ability for rubber and timber yield, clones PB 28/83, Ch 26, RRII lOS, PB 215, PB 252, PB 217. PB 242 and PB 5151 were identified as promising parent materiai for polycross breeding via polyclonal seed gardens. More than 50 per cent of the clones within the progeny of parent clone PB 28/83 were high yielding. This clone has also exhibited positive estimates of general combining ability for annual mean yield, summer yield and timber yield. confinning its prepotent ability to produce superior progeny. From the present study, 29 promising clones derived from the half-sib progenies of eight parents of Malaysian and Indian origin could also be identified.
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