Interrelationship of pollination conditions, fertilization and sunflower seed yield

Abstract

Four commercially important sunflower hybrids (NS-H-45, NS-H-l 11, NS-H-702 and Velja) and their parental components (Ha-74B, Ha-98B, CMS-3-8B, Ha-26B, RHA-583, RHA-R-PI-2/1 and RHA-113N) were used over a period of two years to study the following traits: disk flower corolla length, nectar content, pollen viability, bee visitation, fertilization percentage and seed yield. Relations among the traits were determined by path coefficient analysis. The simple correlation coefficients showed that fertilization percentage and bee visitation had a highly significant influence on seed yield. The corolla length had a positive effect on nectar content, while nectar content had a significant negative influence on pollen viability. The highest significant direct influence on seed yield was that of fertilization percentage, while the effect on nectar content on seed yield was negative but not significant. The coefficient of determination was 0.8071.

Kod četiri komercijalno važna hibrida suncokreta (NS-H-45, NS-H-111, NS-H-702 i Velja) i njihovih roditeljskih komponenti (Ha-74B, Ha-98B, CMS-3-8B, Ha-26B, RHA-583, RHA-R-P1-2/1 i RHA-113N) u dve godine su ispitivana sledeća svojstva: dužina krunice cevastog cveta, sadržaj nektara, vitalnost polena, poseta pčela, % oplodnje i prinos semena. Međuzavisnost ispitivanih svojstava je utvrđena Path coefficient analizom. Prosti koeficijenti korelacije su pokazali da su % oplodnje i poseta oprašivača imali visoko značajan pozitivan uticaj na prinos semena. Značajan pozitivan efekat je imala dužina krunice na sadržaj nektara, a značajan negativan efekat je imao sadržaj nektara na vitalnost polena. Najveći značajan direktan efekat na prinos semena je imao procenat oplodnje, dok je negativan, ali ne i značajan efekat imao sadržaj nektara na prinos semena. Koeficijent determinacije je iznosio 0,8071.