1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)
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Item Growth dynamics and physiological response of selected forestry species to CO2 enriched atmosphere(Academy of Climate Change Education and Research,Vellanikkara, 2019) Anusha, R M; Nameer, P OTerminalia arjtma, Terminalia bellirica and Terminalia chebula are important medicinal plants and part of Triphala, there is less study about the adaptation and mitigation of these species to elevated CO2. This study is helpful to understand about the adaptive and miligative and biochemical efficiency of these plants. Under elevated these three species are showed a belter response in elevated CO2 SOOppm over ambient 400ppm. The plant height, leaf length and width, stem diameter, number leaves and branches, root length, are higher in elevated SOOppm CO2 over ambient 400ppm as well as the biochemical properties like total chlorophyll and carotenoids, ascorbic acid, protein, proline, total sugar are increased dramatically at SOOppm over 400ppm. The photos>Tithetic rate was higher in elevated CO:in all seasons (winter, spring, and summer), stomatal conductance was higher in SOOppm spring and lower at summer. The intercellular CO2 concentration was higher in plants grown in SOOppm T.chebula in winter in the summer season. Transpiration rate was higher in winter and reduced over ambient in summer. Night respiration is less in T.arjuna compared to ambient, and there is a fluctuation concerning seasonality and species. Carbon sequestration, carbon partitioning, carbon mitigation and carbon stocks are high in elevated CO2 growing plants except for T.bellirica. Organic carbon was higher in elevated CO2 than ambient. Potassium, phosphorous and total nitrogen they with species and change in concentration according to elevated CO2. The plants grown in elevated CO2 are healthier than ambient condition and increases the health-promoting characters. These species are more adaptive and show mitigation efficiency and good biochemical efficiency. In future more studies needed to know about the response of plants towards elevated CO2.Item Spectral management for improving hotosynthetic efficiency in polyhouse cultivation of vegetables(Department of Plant Physiology, College of Agriculture, Vellayani, 2016) Anjana J Madhu; Roy StephenItem Validation of temperature induction response (TIR) technique for inducing drought and heat stress tolerence in rice (Oryza sativa L.)(Department of Plant Physiology, College of Agriculture, Vellayani, 2018) Reshma Mohan; Beena, RItem Physiological evaluation of herbicidal effects on rice, broadleaved weeds and sedges(Department of Plant Physiology, College of Horticulture, Vellanikkara, 2019) Linu, C; Girija, TItem Interactive effect of UV radiation and elevated temperature on rice growth and physiology(Department of Plant Physiology, College of Horticulture, Vellanikkara, 2018) Amjath, T; Girija, TRice is a staple food for more than half the world’s population. The growth and productivity of the crop is intimately associated with climatic variants. Among different climatic factors, temperature and incidence of UV-B radiation are important. The incidence of stress (Temperature and UV) at different stages of growth determines the productivity of the crop. Hence the present study was undertaken with the prime objective of evaluating the interactive effect of UV-B radiation and elevated temperature at different phenophases of Uma rice variety and its effect on growth and productivity. The study was carried out at College of Horticulture, Vellanikkara during Jan to May- 2018. The UV-B radiation and atmospheric temperature were maximum during this season. 14 days old Uma seedlings were used as plantingmaterial. It was grown under four different conditions, namely T1(10C lesser than ambient+ low UV-B), T2 (10 C higher than ambient+ low UV-B), T3 (20 C higher than ambient+ low UV-B), T4 (Open condition). The plants were kept in the polyhouses for 30 days during three phenophases of the crop viz, seedling to active tillering (P1), active tillering to early reproductive (P2) and early reproductive to harvest (P2) and returned to ambient condition to complete their life cycle. Morphological, biochemical, physiological and yield parameters were analyzed during the growth period. Exposure of plants to T1 (10 C below ambient) had least negative influence on growth, physiology and yield of the crop across different developmental stages. A 10C increase in temperature above ambient (T2) in phase 1 improved the yield and yield parameter. However the impact was negative under same condition during phase 2 (P2) and phase 3 (P3). Maximum deleterious effects were observed in T3 during phase 2 and 3. Plants grown in open condition had lower plant height and higher number of tillers as compared to plants grown in polyhouse condition (T1, T2 and T3). Number of days to heading was less in plants grown under high temperature conditions (T2 and T3). The photosynthetic rate, stomatal conductance and transpiration rate were maximum in T2 condition in all the three phases of growth. Analysis of biochemical parameters showed that the IAA content was 67 percent lesser in plants grown under open condition as compared to ployhouses during P1. Similar decrease was also found in the case of gibberellic acid and chlorophyll. Amylose content of the grain were significantly reduced in the plants grown under T2 and T3 conditions during P2 and P3. Plants exposed to temperature above ambient level (T2 and T3) during P2 and P3 stages recorded a reduction in yield. Maximum yield reduction was observed in T3 condition which was 13 percent in P2 and 56 percent in P3. Reduction in spikelets number and pollen viability were the main reasons. The study indicates that plants were most sensitive to high temperature stress during the P2 and P3 stages, which can contribute to drastic yield decline while, the early stress can have a positive influence on yield.Item Assessment of water stress tolerence in selectively fertilized coconut (cocos nucifera L.) hybrids(Department of Plant Physiology, College of Agriculture, Vellayani, 2018) Rahul Gupta, K; Roy Stephen