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A field experiment was conducted at Agricultural Research Station, Bhavanisagar, Tamil Nadu Agricultural University, Coimbatore, India during  rabi  (Sep-Oct) seasons of 2000 and 2001 to study the pollen use efficiency of sunflower lines  cms  234 A and RHA 6D-1. The experiments consisted of four treatments, 100% pollen (T 0 ), 75% pollen plus 25% borax as filler material (T 1 ), 50% pollen plus 50% borax as filler material (T 2 ) and 50% pollen and 50% flour of finger millet ( Eleusine coracana  L.) (T 3 ). The results showed that the treatments were significantly differed from each other. All the traits studied recorded superior performance only at 100% pollen availability; the seed yield was very much increased only with an assured availability of sufficient pollen for fertilization. The mean comparison of the treatments for all the characters was T 0 &gt;T 1 &gt;T 2 &gt;T 3 . Though the seed yield was reduced to some extent while supplementing pollen with filler material, it was concluded that 75% pollen with 25% borax filler material may be used instead of 100% pollen, without affecting the economic yield much in the case of pollen scarcity /pollen insufficiency/ in locations where “pollen theft” is common. Borax can be used as supplement at the time of pollination. The use of flour of finger millet as the filler material in the case of pollen insufficiency during pollination does not have any effect on the seed yield and yield attributing characters. In that case the yield was affected only below 50% of pollen availability.

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POLLEN USE EFFICIENCY OF SUNFLOWER (Helianthus annuus L.) LINES cms 234 A AND RHA 6D-1 / EFICIENCIA DE UTILIZACIÓN DE LAS LÍNEAS DE POLEN cms 234 A Y RHA 6D-1 / DE GIRASOL (Helianthus annuus L.) EFFICACITÉ DE L’UTILISATION DU POLLEN DES LIGNÉES cms 234 A ET RHA 6D-1 DU TOURNESOL (Helianthus annuus L.)