000			01457nam a2200193Ia 4500
008			220216s9999 xx 000 0 und d
100			_aLopes U V
245		0	_aEstimates of genetic parameters in rubber tree (Hevea spp). I. General combining ability in juvenile seedlings
260			_bAgrotropica _c1999
300			_a163-168
500			_aSource Year: 2002
520			_aTwenty-six progenies resulting from the crosses of 15 clones of Hevea brasiliensis, H. pauciflora and H. benthamaniana were studied in Bahia, Brazil to estimate general combining ability (GCA) and to evaluate the effect of the array of the parents on the estimates of GCA in unbalanced mating design. Additive and non-additive effects were involved in the control of dry rubber production, trunk girth, bark thickness and resistance to South American leaf blight (Microcyclus ulei). The clones Fx 3864, AVROS 1126, AVROS 255 and Fx 2261 showed the highest estimates of GCA for dry rubber production. AVROS 1126 and AVROS 255 also presented high GCA estimates for trunk girth and bark thichness whereas Fx 3864 and Fx 2261 had low estimates for severity of South American leaf blight. The GCA estimates are greatly affected by using either 1 or 3 cycles (10 tapping/cycle) of the modified Hamaker-Morris-Mann test.
650			_aGenetic parameters
650			_aHevea brasiliensis
700			_aMarques _J R B
700			_aMontriro W R
856			_uRPP 81(6)
942			_cJS
999			_c58799 _d58799