PG Thesis

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    Quality and storage life of oriental pickling melon [Cucumis melo var.conomon(L) Makino] as influenced by major nutrients
    (Department of Olericulture, College of Horticulture, Vellanikkara, 1985) Lissamma Joseph; Ramachandran Nair, S
    The oriental pickling melon (Cucumis melo var. cocomon (L) Makino) was grown in a randomised block design under different organic and inorganic fertiliser treatments, with four replications at the Main Campus of Kerala Agricultural University, Vellanikkara, to study the effect of organic and inorganic manures on the yield, quality and storage life of this crop. The yield response of oriental pickling melon to different treatments was found to be significantly different. The treatment which received the highest dose of NPK in the organic and inorganic combination recorded the maximum yield per plot and number of fruits per plot whereas the treatments which received NPK through organic manures alone recorded relatively low yield. The weight and size of fruits were maximum when the highest dose of NPK was given completely in the inorganic form. The quality of the fruit was assessed by estimating the nutrient content at harvest; moisture, acidity, vitamin C, starch, total soluble solids and crude fibre content of fruits at harvest and thereafter at monthly intervals during storage. Significant difference was observed between treatments for these quality characteristics. During storage moisture, starch and vitamin C content of fruits showed steady decline irrespective of the treatments, whereas acidity and total soluble solids showed an initial increase followed by a gradual decline. The effect of organic and inorganic manures on storage life of oriental pickling melon was assessed by recording the rotting percentage of fruits during storage and it was found that increased degree of rotting occurred in treatments which received inorganic form of NPK, during all periods of storage. The organic form of manures showed a definite advantage over inorganic fertilisers in respect of the storability of oriental pickling melon.
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    Agronomic biofortification of zinc in rice (oryza sativa L.)
    (Department of Agronomy,College of Agriculture, Vellayani, 2019) Amal Jose; Jacob, D
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    Photosynthesis and enzyme activities regulating starch biosynthesis in different varieties of cassava (Manihot esculenta crantz)
    (Department of Plant Biotechnology, College of Agriculture, Vellayani, 2016) Geethu Krishnan, P R; Ravi, V
    The present study on Photosynthesis and enzyme activity regulating starch biosynthesis in different varieties of cassava (Manihot esculenta Crantz) was conducted during the period of 2015-2016 in the Division of Crop Production, ICAR-CTCRI, Thiruvananthapuram. The objective of the study was to study the relation between photosynthesis, leaf area, crop duration and enzymes activities regulating starch biosynthesis in four varieties of cassava (Manihotesculenta Crantz) and to determine limiting factor(s) for low starch content of tubers in low starch varieties. Four varieties selected for the study are viz., SreeVijaya, SreeAthulya, H165, H226. SreeAthulya, a triploid long duration variety had the maximum starch and sucrose content whereas H165, a short duration variety, had the minimum starch content. The different parameters such as morphological, biochemical, enzyme activity, and photosynthetic activity were recorded / assayed for four cassava varieties. Morphological parameters are number of leaves, leaf area, leaf area index and tuber yield. Maximum noumber of leaves and leaf area was observed in the variety SreeVijaya. Photosynthetic activity was observed maximum in the variety SreeVijaya. The minimum number of leaves and leaf area were observed in the varieties H226 and H165. The maximum tuber yield was observed in the variety H226 and minimum tuber yield was observed in the variety H165. Biochemical parameters like sucrose content and starch content were maximum in in the variety SreeAthulya and minimum in the variety H165. The enzymes activities involved in starch biosynthesis assayed in the present study are viz., AGPase, SPS, SS, SuSy and invertase. SreeAthulya had the highest AGPase activity and SuSy activity and high tuber yield. SreeVijaya had the highest SPS activity. H165 had the lowest tuber yield due to decrease in leaf area, sucrose and starch content, photosynthetic activity, lowest enzymatic activities of SuSy, SS. Generally the photosynthetic activity the activities of AGPase, SS and SuSy enzymes were high in high starch variety SreeAthulya. The present study reveals low activity of enzyme sto be the rate limiting for low starch content of varieties H165. Low starch content varieties can be improved by manipulating the activity of these enzymes.
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    Enhancing sweet potato (Ipomoea batatas Lam.) starch extract ability using enzymes
    (Department of Plant Biotechnology, College of Agriculture, Vellayani, 2014) Dhanya Thankachan; Padmaja, G