Performance, inheritance and interrelationships of yield and yield components in sesame (Sesamum indicum L.)

Khalafalla A. Ali, Abdalla B. El Ahmadi, Mohamed E. Ahmed

Abstract


Thirty-six sesame genotypes, eight parents and 28 F1s, were evaluated for two rainy seasons (2005 and 2006) at Gedarif Research Station of the Agricultural Research Corporation (ARC), Sudan. Four of the parents were released varieties viz: Ziraa-9, Kenana-2, Promo and Gedarif-1, and the other four genotypes were advanced lines. The eight parents were crossed in all possible diallel combinations (without reciprocals) to produce 28 single-crosses. The experiment was arranged in a randomized complete block design with three replicates. The parameters measured were days to 50% flowering, days to maturity, plant height, number of branches/plant, number of capsules/plant,  height to first capsule, height to first branch, capsule length, thousand seed weight, seed yield/plant and seed yield/ha. A wide range of variability was exhibited by most characters in the two seasons. The highest seed yield was obtained by the cross Gd2002SPSN53x Gedarif-1 (1081 kg/ha), while the lowest was obtained by the parent Gd2002SPSN29 (326 kg/ha). Broad sense heritability estimates ranged from 55% for number of capsules/plant to 91% for days to maturity in the first season and from 18% for seed yield/plant to 90% for days to maturity in the second season. The expected genetic advance as percentage of the mean varied from 9.36% for 1000-seed weight to 84.69% for number of branches/plant in season 2005 and from 7.50% for days to maturity to 73.00% for number of branches/plant in season 2006. High genetic advances as percentage of the means were recorded for number of branches/plant and height to first

 

 

branch. Lower percentages were recorded for days to maturity, 1000-seed weight and days to 50% flowering. High heritability estimates coupled with moderate to high genetic advance as percentage of the mean were recorded for number of branches/plant and height to first branch. Significant and positive genotypic and phenotypic correlation coefficients in both seasons were observed among the seed yield/ha, seed yield/plant, plant height, number of capsules/plant and height to first capsule. These results indicated the consistency of these interrelationships; therefore, a selection for any of these characters would cause a simultaneous improvement to another character, which would ultimately improve the seed yield.

 


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