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Effect of Bradyrhizobium japonicum on Chlorophyll Content, Nodulation, and Plant Growth in Soybean
Poudyal Roshan Sharma,Prasad B. N. The Korean Society of Crop Science 2005 Korean journal of crop science Vol.50 No.4
Study on effectiveness of Bradyrhizobium japonicum on soybean [Glycine max (L.) Merr.], local cultivar 'Sathiya' were carried out in the garden soil of Trib-huvan University. Different parameters like nodulation, chlorophyll content in fresh leaves and growth of plant in inoculated and uninoculated plant was studied. Pot experiment was conducted in the green house to evaluate the effectiveness of B. japonicum on soybean. It was observed that B. japonicum inoculation increased the number of nodules, shoot length of plant and total chlorophyll content in fresh leaves of soybean plant. However, root length was decreased in all inoculated plants.
Poudyal, R.S.,Nath, K.,Zulfugarov, I.S.,Lee, C.H. Elsevier Sequoia 2016 Journal of photochemistry and photobiology Biology Vol.162 No.-
When phosphorylation of Photosystem (PS) II core proteins is blocked in STN8 knock-out mutants of rice (Oryza sativa) under photoinhibitory illumination, the mobilization of PSII supercomplex is prevented. We have previously proposed that more superoxide (O<SUB>2</SUB>?<SUP>-</SUP>) is produced from PSII in the mutant (Nath et al., 2013, Plant J. 76, 675-686). Here, we clarify the type and site for the generation of reactive oxygen species (ROS). Using both histochemical and fluorescence probes, we observed that, compared with wild-type (WT) leaves, levels of ROS, including O<SUB>2</SUB>?<SUP>-</SUP> and hydrogen peroxide (H<SUB>2</SUB>O<SUB>2</SUB>), were increased when leaves from mutant plants were illuminated with excess light. However, singlet oxygen production was not enhanced under such conditions. When superoxide dismutase was inhibited, O<SUB>2</SUB>?<SUP>-</SUP> production was increased, indicating that it is the initial event prior to H<SUB>2</SUB>O<SUB>2</SUB> production. In thylakoids isolated from WT leaves, kinase was active in the presence of ATP, and spectrophotometric analysis of nitrobluetetrazolium absorbance for O<SUB>2</SUB>?<SUP>-</SUP> confirmed that PSII-driven superoxide production was greater in the mutant thylakoids than in the WT. This contrast in levels of PSII-driven superoxide production between the mutants and the WT plants was confirmed by conducting protein oxidation assays of PSII particles from osstn8 leaves under strong illumination. Those assays also demonstrated that PSII-LHCII supercomplex proteins were oxidized more in the mutant, thereby implying that PSII particles incur greater damage even though D1 degradation during PSII-supercomplex mobilization is partially blocked in the mutant. These results suggest that O<SUB>2</SUB>?<SUP>-</SUP> is the major form of ROS produced in the mutant, and that the damaged PSII in the supercomplex is the primary source of O<SUB>2</SUB>?<SUP>-</SUP>.
Operator Revenue Maximizing Heuristics with QoS Guarenetees for Real Time Traffic in 4G Networks
( Neeraj Poudyal ),( Ha Cheol Lee ),( Byung Seub Lee ) 한국인터넷정보학회 2011 KSII Transactions on Internet and Information Syst Vol.5 No.5
This paper attempts to maximize the operator`s revenue while simultaneously providing a multi-constraint, multi-hop and deterministic QoS provisioning for real time traffic in IEEE 802.16m based 4G networks. The optimal solution to such a problem is NP-complete and therefore not feasible to be solved in a tolerable polynomial time. For this reason, we also provide a simple price based greedy heuristic to be used along with the admission control. Simulation results for different QoS schemes show that the heuristic produces a revenue that is very close to the optimal revenue, and is far more aggressive than the size based and other common algorithms that are computationally feasible to be implemented in IEEE 802.16m.
Effect of Bradyrhizobium japonicum on Chlorophyll Content, Nodulation, and Plant Growth in Soybean
Roshan Sharma Poudyal,B. N. Prasad 韓國作物學會 2005 Korean journal of crop science Vol.50 No.4
Study on effectiveness of Bradyrhizobium japonicum on soybean [Glycine max (L.) Merr.], local cultivar 'Sathiya' were carried out in the garden soil of Trib-huvan University. Different parameters like nodulation, chlorophyll content in fresh leaves and growth of plant in inoculated and uninoculated plant was studied. Pot experiment was conducted in the green house to evaluate the effectiveness of B. japonicum on soybean. It was observed that B. japonicum inoculation increased the number of nodules, shoot length of plant and total chlorophyll content in fresh leaves of soybean plant. However, root length was decreased in all inoculated plants.
Nath, Krishna,Elizabeth, John,Poudyal, Roshan Sharma,Ko, Su Yeon,Lim, Woon Ki,Lee, Choon-Hwan Korean Society of Photoscience 2013 Rapid communication in photoscience Vol.2 No.1
The photosystem II (PSII) light harvesting complex (LHC) consists of a variety of pigment protein complexes which are involved in structural organization and regulation of photosynthetic unit. These LHC proteins encoded by a group of Lhcb genes are essential for the structural integrity of PSII supercomplex, the channeling the excitation energy to the reaction center of PSII and its redistribution to photosystem I by state transitions. Numerous studies with the help of recent technological advancements have enabled a significant progress in our understanding on the structure of PSII-LHCII supercomplexes and their mobilization under various light conditions. Here, we present a mini-review on the latest concepts and models depicting the structure of PSII-LHCII supercomplexes and the role of Lhcb proteins in their supra-molecular organization. Also we will review on the current understandings and remaining problems involved in the mobilization of the supercomplexes during state transitions and during high light illumination for controlling light energy distribution between the two photosystems.
Nath, K.,Jajoo, A.,Poudyal, R.S.,Timilsina, R.,Park, Y.S.,Aro, E.M.,Nam, H.G.,Lee, C.H. North-Holland Pub ; Elsevier Science Ltd 2013 FEBS letters Vol.587 No.21
Photosystem II (PSII) is vulnerable to high light (HL) illumination resulting in photoinhibition. In addition to photoprotection mechanisms, plants have developed an efficient PSII repair mechanism to save themselves from irreversible damage to PSII under abiotic stresses including HL illumination. The phosphorylation/dephosphorylation cycle along with subsequent degradation of photodamaged D1 protein to be replaced by the insertion of a newly synthesized copy of D1 into the PSII complex, is the core function of the PSII repair cycle. The exact mechanism of this process is still under discussion. We describe the recent progress in identifying the kinases, phosphatases and proteases, and in understanding their involvement in the maintenance of thylakoid structure and the quality control of proteins by PSII repair cycle during photoinhibition.