01902naa a2200229 a 450000100080000000500110000800800410001910000180006024500790007826000090015730000190016649000080018552012740019365000130146765000130148065000170149365300080151065300140151865300080153270000190154077301130155914537582004-10-28       1985    bl uuuu     u00u1 u    #d1 aMILLER, J. F.  aImprovement of yield in sunflower utilizing reciprocal full-sib selection.  c1985  ap.715-720. t.2  vt.2  aA reciprocal full-sib selection scheme was initiated in 1977 utilizing two populations of sunflower (Helianthus annuus L.). The first population was comprised of a diverse collection of B-lines, whereas the second population was comprised of branched R-lines. Gibberellic acid (GA3) at a rate of 50 ppm was used to sterilize the male flowers on the main head of the branched R-lines. Pollen from selected B-line plants was applied to the male-sterilized main head of the branched R-line to make hybrid seed. Hybrids were tested and selections made to continue the next cycle of selection. Three cycles of testing have been completed. Yield increased 70 kg/ha per cycle compared with the standard check representing a gain of 6.3% for each two year cycle. Inbred lines...were derived from the parents of the 15 highest yielding hybrids in cycle 1 and evaluated for yield and other agronomic characteristics. Five male lines and five female lines had excellent general combining ability as well as high performance in specific combinations. The reciprocal full-sib selection scheme is a effective method to improve basic breeding populations while simultaneously identifying material which will produce inbred lines with high yield and improved general combining ability.  abreeding  aGirassol  aMelhoramento  aEUA  aSunflower  aUSA1 aHAMMOND, J. J.  tIn: CONFERENCIA INTERNACIONAL DE GIRASOL, 11., 1985, Mar del Plata. Actas. Mar del Plata : ASAGIR/ISA, 1985.