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2018 - 20202
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Subject: Botany × Author: Jashanpreet Kaur × End date: 2022 × Type: Thesis ×
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    ThesisItemOpen Access
    Evaluation of morpho-physiological and biochemical changes in garlic (Allium sativum L.) bulbs stored under different temperature conditions
    (Punjab Agricultural University, Ludhiana, 2020) Jashanpreet Kaur; Sharma, Rajni
    The present investigation was carried out to assess the optimum storage temperature for garlic (Allium sativum L.) with minimum deterioration and also for the most promising genotype on the basis of morpho-physiological and biochemical parameters. Garlic genotypes (PG-17, PG- 18, PG-29, PG-46 and PG-48) were kept in three storage temperatures; 0°C, 15°C and room temperature for four months for evaluation of various parameters and then planted to evaluate their growth performance. Temperature and months of storage had a decreasing influence on garlic genotypes. PG-18 was found to be a promising genotype irrespective of temperature storage conditions due to its better performance than other genotypes in morphological properties prior to storage such as bulb diameter (4.5cm), neck diameter (2.7cm), bulbing ratio (0.6), bulb’s fresh weight (28.7g) and dry weight (17.5g), number of cloves per bulb (24.3). PG-18 also retained maximum biochemical composition till end of storage such as total phenols (10.5 mg/g DW), flavonoids (0.59 mg/g DW), ascorbic acid (5.70 mg/g DW), total soluble sugars (17.25 mg/g DW) and reducing sugars (12.71 mg/g DW). Also, genotype PG-18 had highest germination percentage (66.93%), maximum vigour index II (2580) and highest survival percentage (66.45%). Room temperature storage was found to be the optimum storage condition for garlic bulbs as garlic of room temperature performed better than other temperature stored garlic by the end of storage in case of compactness, bulb’s fresh weight (14.86g) and dry weight (8.86g), total phenols (10.46 mg/g DW), ascorbic acid (5.12 mg/g DW) and total soluble sugars (11.88 mg/g DW). Also, room temperature stored garlic, on subjecting to germination, had highest germination percentage (77.01%) and survival percentage (88.40%), maximum vigour index II (2717) and more plant fresh weight (51.40g) , dry weight (21.49g) and height (69.72 cm) than 15°C garlic.
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    ThesisItemOpen Access
    Herbaceous plant diversity and its nutrient status in various land use systems of selected localities in Punjab
    (Punjab Agricultural University, Ludhiana, 2018) Jashanpreet Kaur; Sharma, Rajni
    The present study on herbaceous plant diversity of three land use systems viz fallow land, canal bunds and cultivated land at two locations Ludhiana and Sangrur revealed overall sixty seven plant species at these sites. Among these fifty two plants were dicots and fifteen were monocots. Plants were distributed in twenty seven families out of which Poaceae and Asteraceae were dominant. Variations were recorded for plant species in all the land use systems and locations. Only few differences in emergence, flowering, fruiting, seed maturity and senescence of plant species was observed when land use systems were compared. For morphological parameters, the maximum plant height (178.16 cm) and shoot length (183.50 cm) was recorded for Saccharum spontaneum whereas diameter (19.23 cm) was recorded maximum for Ricinus communis and root length (23.5 cm) was maximum for Conyza bonariensis. Diversity indices values showed variations with change in months, land use systems and locations. Among land use systems of both locations, Density/m2 was recorded to be maximum for Parthenium hysterophorus (10.5 m-2) of fallow land (Sangrur) in September and IVI (115) was maximum for Amaranthus viridis of cultivated land (Ludhiana) in June. Comparison of mean values of Shannon Wiener index (2.30) and Brillouns index (2.16) reflected that mean values were maximum for fallow land (Sangrur) which reflected presence of maximum diversity in this system. Simpson diversity index mean values (0.88) were maximum for canal bunds of both locations reflecting maximum diversity of dominant plant species. Eveness index representing equal number of individuals per species was maximum for fallow land (0.77) (Ludhiana) followed by cultivated land. Annual values for total biomass (5733 kg/ha), nitrogen uptake (96.66 kg/ha), phosphorus uptake (21.55 kg/ha) and potassium uptake was recorded to be maximum for fallow land (Sangrur). On monthly basis, for July maximum biomass (3744.33kg/ha), nitrogen uptake (66.15kg/ha), phosphorus uptake (17.71) and potassium uptake (52.03kg/ha) was recorded.