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2014 - 20182
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Subject: Fruit Science × Author: CHAUHAN, NIRMLA ×
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    ThesisItemOpen Access
    SURVEY AND SELECTION OF APRICOTS (Prunus armeniaca L.) FROM WILD POPULATION IN HIMACHAL PRADESH
    (UHF, NAUNI, 2018-10) CHAUHAN, NIRMLA; THAKUR, DINESH SINGH
    ABSTRACT The present study “Survey and selection of apricots (Prunus armeniaca L.) from wild population in Himachal Pradesh” aimed to, and magnitude of variability in apricots growing wild. A total of 92 healthy and bearing wild apricot genotypes on the basis of pre selection survey were marked across apricot growing areas of Shimla and Kinnaur districts of Himachal Pradesh during 2015-17. Marked trees were observed to be upright to spreading in growth habit, trunk girth in Shimla (18.72-78.84 cm) and Kinnaur (35.10-106.17 cm). Yield and yield efficiency were ranged between 36.00-54.00 kg/tree and 38.00-57.00 kg/tree, and 0.09-1.47 kg/cm2 and 0.05-0.45 kg/cm2 respectively, in Shimla and Kinnaur district. The physical characters like fruit length, fruit breadth, fruit weight, fruit firmness, stone weight, stone length and breadth, stone width, pulp/stone ratio, kernel weight and oil content were 22.06-41.31 mm, 20.39-38.41 mm, 8.70-35.34 g and 1.696.97 kg/cm2, 1.00-4.04 g, 14.94-24.87 mm and 12.28-19.50 mm, 8.40-12.89 mm, 4.75-23.72, 0.110.60 g and 37.15-54.08 per cent, respectively under both the districts. TSS, titratable acidity, total sugars, reducing sugars, non-reducing sugars, sugar acid ratio, carotenoid content and phenols were 11.75-21.40 °Brix, 0.48-2.55 per cent, 5.59-16.08 per cent, 1.09-6.89 per cent, 2.41-9.65 per cent, 2.27-26.95, 1630.16-2148.35 µg/100g, 53.29-95.28 mg/100ml, respectively. High heritability coupled with high genetic gain was found for the character trunk girth, stone weight, reducing sugar, kernel weight, pulp to stone ratio, titratable acidity, and leaf breadth which indicated that these characters were under the strong influence of additive gene action and hence simple selection procedure based on phenotypic expression of these traits would be more reliable. Out of 92 wild apricot genotypes studied 19 superior genotypes were selected for further evaluation after field conservation and 15 genotypes used as gene source for the development of new hybrids.
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    ThesisItemOpen Access
    POLLINATION STUDIES IN RELATION TO FRUIT DROP IN PERSIMMON (Diospyros kaki L.) CV. HACHIYA
    (UHF,NAUNI, 2014) CHAUHAN, NIRMLA; THAKUR, B.S.
    ABSTRACT The present investigations entitled “Pollination studies in relation to fruit drop in persimmon (Diospyros kaki L.) cv. Hachiya was carried out at Horticulture Research and Training Station Kandaghat. Effect of different modes of pollination (no pollination, open pollination and hand pollination) using Diospyros virginiana and Kandaghat Pink (local selection) as a source of pollen on fruit set, fruit development and fruit drop were evaluated. Anthesis and dehiscence started early in the morning and continued upto 6:00 pm in the evening. Stigma receptivity was maximum on the day of anthesis and pollen viability was recorded highest in Kandaghat Pink (96.87 %). Highest pollen germination (64.10 %) was recorded with 15 per cent sucrose solution in Kandaghat Pink whereas it was minimum (15.07 %) in Diospyros virginiana with 5 per cent sucrose solution. Fruit set under different modes of pollination varied from 84.61-97.12 per cent. The growth pattern followed a sigmoid growth curve irrespective of different modes of pollination. Fruit drop was minimum when Diospyros virginiana was used as a source of pollen. However, maximum fruit drop was observed when the flowers were simply bagged. Fruit size, weight and number of seeds were different in fruits from different mode of pollination while other fruit character namely, total soluble solids (TSS), titratable acidity and sugars were not influenced by pollination.