University of Khartoum

Variability For Seed Yeild And Agronomic Characters In Some Sunflower (Helianthus Annuus L.) Lines Under Two Levels Of Phosphorous

Variability For Seed Yeild And Agronomic Characters In Some Sunflower (Helianthus Annuus L.) Lines Under Two Levels Of Phosphorous

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Title: Variability For Seed Yeild And Agronomic Characters In Some Sunflower (Helianthus Annuus L.) Lines Under Two Levels Of Phosphorous
Author: Ahmed, Manal Mustafa Mohamed
Abstract: An investigation was conducted in the Demonstration Farm, Faculty of Agriculture, University of Khartoum, Shambat, for one season (2003/04) to determine the variability for phosphorous uptake in twenty inbred lines of sunflower. Beside that amount of genetic variability and heritability for yield and its components in sunflower lines was estimated. The layout of the experiment was a split – plot design with three replications and two levels of phosphorous which are the main plots. Eighteen morphological characters were studied and their genotypic and phenotypic variances, heritability, genetic coefficient of variation, expected genetic advance and path coefficient analysis were estimated. Non significant differences were detected among all traits for phosphorous application, while, it was highly significant for the lines except the trait phosphorous utilization efficiency. The interaction between line and phosphorous revealed non significant differences for all characters studied except days to 50 % flowering. Significant differences were recorded for all genotypic, and phenotypic variances. The high estimates of heritability (h2 > 70 %) were reported for days to 50 % flowering, number of heads/plant and 1000 – seed weight. Low estimates of heritability (h2 < 50 %) were detected for stem diameter, days to maturity, number of seeds/plant, empty seeds (%), seed yield/plant, agronomic efficiency, phosphorous utilization efficiency (PUE) and seeds phosphorous content. Also highest and lowest genetic coefficient of variations (GCV) were for phosphorous fertilization efficiency (PFE) and agronomic efficiency (AE), respectively. Whereas the high expected genetic advance was recorded for number of seeds/plant. Path analysis indicated that 1000 – seed weight had the highest positive direct effect on seed yield/plant and plant height gave the highest positive indirect effect via days to 50 % flowering.
Description: 76 Pages
URI: http://khartoumspace.uofk.edu/handle/123456789/11753
Date: 2015-06-14


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