Browsing by Author "Reuben, S.O.W.M."
Now showing 1 - 2 of 2
- Results Per Page
- Sort Options
Item Agronomic performance and Heritability of some components of Robusta Coffee (Coffea canephora Pierre ex Froehner) clones(2003) Reuben, S.O.W.M.; Marandu, E.F.T.; Misangu, R.N.The present investigation evaluates the performance of newly identified clones in the major coffee growing zones of Kagera region, Tanzania. Five clones namely MS1/95. MS2/95. MS3/95, MS5/95. MS6/95 selected from individual trees in farmers fields and FS a control variety, were grown in farmers fields in March 1998 a four locations representing 3 coffee growing zones of Kagera region. Each chosen farmer's field was a replicate. Plant girth and fruit set percentage differed significantly among the clones tested MS2/95 had the thickest stems while MS3/95 gave the highest percentage of fruit set. Percent fruit set ranged from 13.5% - 31.4% for MS6/95 and MS3/95 respectively. Locations differed on yield % bearing primary branches canopy radius plant girth and plant height. Kabirizi B gave the highest yield of 1853.8 kg/ha while Chanika gave the lowest yield of 358.8 kg/ha. The yield differences between location were associated with performance of clones on plant height, plant girth canopy radius, primary branches and % bearing primary branches. Plant height girth canopy radius, primary branches, % bearing primary branches and yield of clean coffee were positively corrrelated among themselves. Heritability estimates were high (50%) for plant girth, berries per node and fruit set percentage. Heritability ranged from negligible for yield to 125% for plant girth. Expected genetic gain varied with heritability ranging from negligible to 36.5% for fruit set percentage. Yield of clean coffee had appreciable amounts of clone x location interaction and environmental variance in relation to the total phenotypic variance. It should be possible to realize substantial gain from selection and genetic improvement for plant girth, berries per node and fruit set percentage.Item Resistance of arcelin incorporated bean (Phaseolus vulgaris L.) hybrids and their parental cultivars against the bean bruchid Zabrotes subfasciatus (Boh)(2001) Misangu, R.N.; Nchimbi-Msolla, S.; Reuben, S.O.W.M.A hybridization bean breeding programme aimed at breeding beans resistant against the bean bruchid species Z. subfasciatus which destroys beans in storage was carried out at Sokoine University of Agriculture (SUA) Morogoro. Tanzania between 1994-1997. Five potential local bean varieties/lines were crossed to a bruchid resistant bean line RAZ 24-2 which was developed at SUA by selection from ClAT segregating RAZ bean populations. Seeds of RAZ lines contain arcelin a protein which confers resistance against Z. subfasciatus and can be transferred into other varietiess by hybridization. The backcross breeding procedure was adopted and five arcelin containing progenies were developed from this breeding programme. Seed of the developed progenies and those of the parents were then tested for resistance against Z. subfasciatus a randomized complete block design with 5 replications. There were significant difference, (P < 0. 05) in resistance against Z. subfasciatus among the genotypes. Results indicated that arcelin incorporated genotypes were superior over the arcelin deficient parents for resistance against Z. subfasciatus. Generally, the presence of arcelin in bean seeds delayed bruchid development reduced the number of emerged bruchids damage on bean seeds. However, bruchids managed to lay many eggs on seeds of all cultivars tested suggesting that bruchids are not inhibited from laying eggs on archelin containing seeds.