Inheritance and Stability of some Agronomic Traits of African Yam Bean (Sphenos‌tylis s‌tenocarpa (Hochst ex. A. Rich) Harms)

Authors : Daniel B ADEWALE

Pages : 76-86

View : 13 | Download : 6

Publication Date : 2016-07-30

Article Type : Research Paper

Abstract :African yam bean insert ignore into journalissuearticles values(AYB);, Sphenostylis stenocarpa, an indigenous African pulse has immense nutritional significance. The understanding of inheritance pattern and stability status of agronomic trait is primary to their genetic improvement. Thirty AYB genotypes were evaluated for 100 seed weight insert ignore into journalissuearticles values(100SW);, seed weight per pod insert ignore into journalissuearticles values(SWP);, days to 50% flowering insert ignore into journalissuearticles values(D50F); and days to seedling emergence insert ignore into journalissuearticles values(DSE); in a randomized complete block design of three replications. This study was conducted at Ibadan, Ikenne, Mokwa and Ubiaja in Nigeria. Genotypic variation was significant insert ignore into journalissuearticles values(p ≤ 0.05); for all characters except DSE. Location and Genotype x Location interactions were significant insert ignore into journalissuearticles values(p ≤ 0.05); for the four characters. D50F had the least genotypic and phenotypic coefficient of variation insert ignore into journalissuearticles values(GCV and PCV); of 10.26% and 11.05% , respectively. The highest GCV, PCV and genetic advance occurred in SWP at 34.55%, 37.88% and 64.94% , respectively. Broad sense heritability ranged between 77.61% insert ignore into journalissuearticles values(DSE); to 89.07% insert ignore into journalissuearticles values(100SW);. Repeatability was highest insert ignore into journalissuearticles values(13.83%); in 100SW. The performance of TSs87, TSs91 and TSs125 was highly significant for DSE and 100SW. The joint regression analysis identified TSs24 and TSs82 as the most stable genotypes for DSE and SWP with regression coefficient insert ignore into journalissuearticles values(bi ); of 0.94 and 0.97 and deviation from linearity insert ignore into journalissuearticles values(Sdi 2 ); of 0.028 and -0.028 respectively. The most stable genotypes for D50F and 100SW were TSs61 and TSs84 with b = 1.015 and 1.017 respectively. The study revealed potential breeding values of four agronomic traits in AYB.
Keywords : African yam bean, accessions, underutilized species, agronomic traits