Abstract
Field experiments were conducted on forty nine shallot genotypes to study the nature of correlations between bulb yield and other related characters at Sirinka and Girana in northeastern Ethiopia. Observations were made on ten plant samples for data analysis. At Girana, total bulb yield per plant showed high and positive phenotypic and genotypic correlations with plant height, leaf number, leaf diameter, bulb splits, marketable yield, biological yield and bulb dry weight. At Sirinka, the same trend was observed at genotypic level while, at phenotypic level, bulb yield correlated positively and significantly with plant height, lateral branches, bulb splits, bulb diameter marketable yield, biological yield and bulb dry weight. At both locations, biological yield, harvest index, marketable yield, bulb splits, pungency, laterals branches, bulb dry weight and bulb diameter exerted a positive direct effect on bulb yield at phenotypic level. At genotypic level, biological yield, bulb splits, harvest index, plant height, leaf diameter, marketable yield and pungency showed a positive direct effect on bulb yield per plant at Grana. The same trend at genotypic level was observed at Sirinka. The correlation of leaf number, plant height and leaf diameter with bulb yield and their positive indirect effects on bulb yield via their contribution to biological yield indicated that they could be considered as useful traits for selection in a breeding program of shallot for bulb yield.
Highlights
Path Coefficient AnalysesThe path coefficient analyses were estimated with the simultaneous solution of the following general formula suggested by Dewey and Lu (1959)
At Girana the interrelationship of total bulb yield per plant was significantly positive with plant height, leaf number, leaf diameter, bulb splits, marketable yield, biological yield and bulb dry weight both at phenotypic and genotypic levels (Table 1)
PH= plant height, LPP= leaves per plant, LD= leaf diameter, LBPP= lateral branches per plant, BSPP= bulb splits per plant, BD=bulb diameter, TYPP= total yield per plant, MYPP= marketable yield per plant, BYPP= biological yield per plant, HI= harvest index, BDW= bulb dry weight, DTM= days to maturity, TSS= total soluble solids, and PCY= pungency
Summary
The path coefficient analyses were estimated with the simultaneous solution of the following general formula suggested by Dewey and Lu (1959). Rij = Pij + å rikPkj , Where, rij = mutual association between the independent character (i) and dependent character (j) as measured by the genotypic correlation coefficient Pij = components of direct effect on the independent character (i) on the dependent character (j) as measured by the genotypic path coefficient å rikPkj = Summation of components of indirect effects of a given independent character (i) on the given dependent character (j) via all other independent characters (k). To determine Pij values, square matrices of the correlation coefficients between independent characters in all possible pairs inverted and multiplied by the correlation coefficients between the independent and dependent characters. The residual effects were estimated using the formula:
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