Journal of Horticultural Sciences

S. Lal ¹, D. Kumar ¹, D. B. Singh ¹, N. Ahmed ¹, R. Kumar ¹, G. A. Dar ¹

Affiliations
1 Central Institute of Temperate Horticulture, Old Air Field, PO: Rangreth-190007, IN

Abstract

Pre-harvest application of calcium chloride (0.5, 1.0, and 1.5 %) and gibberellic acid(10, 20 and 30 ppm) at 80% blooming, fruit-set and at 15 days before harvest were carried out on 5-year old trees of apricot cv. Harcot. All the treatments significantly reduced physiological loss in fruit weight, fruit diameter and spoilage percentage during storage. However, CaCl₂ @ 1.5% was found to be most effective in minimizing weight loss in fruits during storage compared to Control. Fruits quality (TSS, titrable acidity, TSS/TA, ascorbic acid, total sugar, etc.) was also found to be better (even at 8 days of storage at ambient condition with this treatment) compared to Control. Hence, it can be concluded that pre-harvest foliar application in apricot cv. Harcot with CaCl₂ @ 1.5% at three stages, i.e., 80% blooming, at fruit-set and 15 days before harvest, enhances shelf-life of the fruit from 3-5 days storage to 8 days storage, and can maintain good fruit quality under ambient storage-condition for up to 8 days.

Keywords

Pre-Harvest, Harcot, Calcium Chloride, Gibberellic Acid, Ambient Condition Storage.

Full Text

   

S. R. Singh ¹, N. Ahamed ¹, K. K. Srivastava ¹, D. Kumar ¹, S. Yousuf ¹

Affiliations
1 ICAR-Central Institute of Temperate Horticulture, Old Air Field Rangregth, Srinagar - 190 007, Jammu and Kashmir, IN

Abstract

To assess the nature and magnitude of genetic diversity in long day onion germplasm by using the principal component analysis and single linkage cluster analysis an experiment was carried out with 34 onion genotypes. High coefficient of variation with wide range in traits indicated an appreciable variability in germplasm. Genotypes were classified into seven principal components having Eigen value > 1, cumulatively accounted for 83.87% of total variability. Principal Component - I contributed for 24.73% of total variation for followed by principal component-II (15.27%). PC-I had high positive loading for bulb weight (0.401), marketable yield (0.338), total bulb yield (0.401) and PC-II had high positive loading for plant height (0.412), PC-III for high T.S.S. (0.276) PC -IV for A grade bulbs (0.436), PC-V for polar diameter of bulbs (0.514), PC-IV negatively loaded with purple blotch (-0.461) and PC-VII for narrow neck thickness (-0.515). Plotting PC-I aganist PC-II differenciated CITH-O-13, CITH-O-4, CITH-O-22, CITH-O-19, CITH-O-9, CITH-O-6 and CITH-O2 as most divergent genotype.On the basis of single linkage cluster means cluster-I was most importent for average bulb weight, minimum bolters, high marketble bulb percentage high marketable and total bulb yield whereas cluster -II was important for maximum nuber of leaves/plant and minimum neck thicknes. Highest inter-cluster distance was observed between cluter II and Cluster-I(873.5%).Most divergent genotypes with high inter cluter distance could be the most appropriate parents for crop impovement in onion.

Keywords

Genetic Diversity, Onion, Principal Component Analysis, Single Linkage Cluster Analysis.

Full Text