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|Authors:||Shintre, Sanjay Vilas|
|Title:||GENETIC VARIABILITY AND CORRELATION STUDIES IN ONION (Allium cepa L.) WITH SPECIAL REFERENCE TO STORAGE QUALITY|
|Publisher:||MAHATMA PHULE KRISHI VIDYAPEETH RAHURI, 413 722 DIST - AHMEDNAGAR, Maharashtra State (India)|
|Abstract:||Thirty onion cultlvars obtained from different geographic regions were evaluated for their morphological and biochemical variability and genetic diversity in bulb characters and storage quality. Significant differences were observed among the onion cultivars for these characteristics indicating high magnitude of variability in the genotypes under study. The estimates of phenotyplc coefficient of variation (PCV) were higher as compared to genotypic coefficients of variation (GCV). Very high heritability was obtained for the character dry matter (%) followed by TSS (%). High heritability value with high genetic advance was observed for the characters yield, bulb weight, total losses (%), sprouting losses (%) and bolting (%) indicating high additive genetic variance and hence, these characters can be improved by selection. The yield was significantly and positively correlated with bulb weight and reducing sugars (%) , while it was negatively correlated with neck thickness, root plate diameter, rotting losses (%), sprouting losses (%), total losses (%). The total losses (%) were significantly and positively correlated with rotting (%), sprouting (%)and PLW losses (%), while it was negatively correlated with non-reducing sugars (%), TSS (%) dry matter (%) and yield. The mean total losses recorded during five months storage period (14th May, 1992 to 14th October, 1992) due to rotting, sprouting, PLW and total losses were 5.27%, 41.12%, 38.25% and 84.64% respectively. Out of thirty cultivars, twenty one and nine had red and white bulb colour, respectively. Two cultivars N-2-4-1 and No.781 recorded less than 40% total storage losses. Cultivar N-2-4-1 (32.90%) followed by No.781 (36.00%) recorded the least storage losses and were found to be per cent promising. During the five months storage period TSS and dry matter content were found to be increased. The D statistics revealed that there was wide diversity among the cultivars ranging from 6.51 to 1330.76. On the 2 basis of D values, thirty onion cultivars were grouped under 13 clusters. A tentative breeding programme has been suggested.|
|Appears in Collections:||Thesis|
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