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Search Results: 1 - 10 of 21594 matches for " Arvind Kumar and Shailaja Hittalmani "
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Response of rice (Oryza sativa L.) genotypes under aerobic conditions
Keshava Murthy B. C, Arvind Kumar and Shailaja Hittalmani
Electronic Journal of Plant Breeding , 2011,
Abstract: A field experiment was conducted during wet season 2009 to study the response of rice genotypes under aerobic conditions.Variance studies revealed significant differences among the genotypes for the traits, days to flowering, plant height, harvestindex, grain yield, panicle number, straw yield, panicle length, test weight and biomass. Higher values of heritability and geneticadvance were observed for plant height and days to flowering. Grain yield per plot showed positive association with harvestindex and total biomass. Correlation and path analysis revealed an ideal plant type of genotype under aerobic conditions shouldhave high harvest index and biomass. Eight rice genotypes with increased yield advantage over checks have been identified assuitable entries for aerobic cultivation. Results also suggested that all rice genotypes are not suitable for aerobic method ofcultivation and the genotypes which are able to acclimatize to the non-puddled aerobic conditions should be identified andreleased.
Correlation study for Protein Content, Grain yield and Yield Contributing Traits in Quality Protein Maize (QPM) (Zea mays L.)
Ravi V. Mural*, Chikkalingaiah And Shailaja Hittalmani
Electronic Journal of Plant Breeding , 2012,
Abstract: Seventy Quality Protein Maize (QPM) (Zea mays L.) hybrids were grown in duplicate randomized complete block design forcharacter association study to assess the relationship among total grain protein content, grain yield and its components. Totalgrain protein showed significant correlation with plant height and ear height. Character association analysis revealed strongpositive association of Grain yield per plant with plant height, ear height, ear length, ear diameter, kernel rows per cob, kernelsper row, test weight and shelling per cent. Total grain protein showed strong negative association with days to 50 % flowering,days to anthesis and days to 50% silking. Hence, simultaneous selection of plant height and ear height would contribute for theimprovement of the grain yield per plant and total protein content in the grains at the same time.
Genetic variability and correlation studies in selected mulberry (Morus spp.) germplasm accessions
B. C. Keshava Murthy, Puttaraju H. P and Shailaja Hittalmani
Electronic Journal of Plant Breeding , 2010,
Abstract: Genetic variability analysis and heritability of different yield contributing characters were studied in 26 genotypes ofmulberry. Variance analysis for characters revealed significant differences among the accessions. Phenotypic coefficient ofvariation (PCV %) was found higher than the genotypic coefficient of variation (GCV %) for all the characters studied.High genetic advance coupled with heritability was observed in the characters namely, number of branches per plant, leafyield per plant, leaf-shoot ratio, hundred leaf weight and total shoot length. Significant positive correlations to leafyield/plant were observed for the characters, number of branches/plant (0.835**), longest shoot length (0.823**) and totalshoot length (0.707**). Leaf yield/plant is an important agronomic character induced by many associated traits and hencecharacters like number of branches/plant, longest shoot length and total shoot length should be considered crucial parametersfor selection in mulberry breeding programme.
Pollen fertility Vs Spikelet fertility in F2 of a CMS based hybrids in rice (Oryza sativa L.) under Aerobic condition
N.Naresh Babu,N.Shivakumar and Shailaja Hittalmani
Electronic Journal of Plant Breeding , 2010,
Abstract: Identification of maintainer and restorers from rice germplasm through test crossing is the initial step in three line heterosisbreeding. Maintainer lines can be converted into cytoplasmic male sterile lines to utilize in development of rice hybrids.Restorer lines can be used as males to produce F1 hybrids. Three hundred F2 plants of the cross KCMS 26A X IET 19886were grown under aerobic situation and fifty randomly selected plants were analyzed for per cent pollen fertility (using oneper cent I-KI solution) and per cent spikelet fertility. Based on the per cent pollen fertility (PF %) the individual plants weregrouped as effective restorer (>96% PF), partial restorer (21-95% PF), partial maintainer (6-20% PF) and maintainer(<5%PF) lines. Based on spikelet fertility (SF %) individual plants were grouped as effective restorer (>80% SF), partialrestorer (21-79% SF), partial maintainer (1-20% SF) and maintainer (<1%SF). There was strong evidence for relationshipbetween pollen fertility and spikelet fertility. Potential restorer is one, that would produce high per cent of seed set in F1while, a potential maintainer would produce 100 per cent sterile pollen in F1. The results in the current study with F2progenies of a cross involving male sterile line indicated that spikelet fertility and pollen fertility are the potential traits inidentification of restorer and maintainer lines, respectively.
Effect of drought on yield potential and drought susceptibility index of promising aerobic rice (Oryza sativa L.) genotypes
Naresh Babu, N., Shailaja Hittalmani, Shivakumar N., Nandini C.
Electronic Journal of Plant Breeding , 2011,
Abstract: Selection of drought tolerance is highly complex and involves evaluating genotypes either for high yield potential or stable performance under varying degrees of water stress. Seventeen advanced rice genotypes were evaluated under aerobic and water stress condition at Department of Genetic and Plant Breeding, GKVK, UAS, Bangalore during summer 2010. Water stress was imposed at late vegetative stage by withholding irrigation supply in one experiment for 15 days and other was maintained as aerobic control. Drought susceptibility index (DSI) and Relative yield (RY) values were used to describe yield stability and relative yield among genotypes. In the present study, there were high variations in drought susceptibility index and relative yield among genotypes. DSI values ranged from -9.37 (25P25) to 18.48 (IR 68897B) and mean RY values were 0.707 and 0.752 for Aerobic condition and water stress respectively. Higher relative yield under water stress indicated the positive response of genotypes to drought. The varieties MAS26, SEL 128, 25P25, PHB 71, MAS25, IR 58025B and MAS946-1 showed high yield potential and yield stability (i. e., DSI < 1 and RY > mean RY). MAS26 and SEL 128 not only have yield stability but they also have high per day productivity per drop of water. So these varieties could be further tested for drought confirming characters and could be used as donor parents in drought tolerance breeding in rice.
Simulation & Performance Evaluation of QoS Routing Protocol for Adhoc Networks Using Directional Communication  [PDF]
Arvind Kumar, Rajeev Tripathi
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2012, DOI: 10.4236/ijcns.2012.512087
Abstract: A wireless ad-hoc network is a self-organized wireless network without fixed or backbone infrastructure. All nodes have routing capability and use peer-to-peer packet transmission or forward packets to other node using multi hop communication. Now days mobile ad-hoc networks are being used for different applications and traffics, so it require quality of service (QoS) support in routing protocol. In this paper, a modified QoS routing protocol using directional antenna has been proposed. High and normal priority can be assigned based on type of traffic. All the nodes in the path used by high priority flow are reserved as high priority flow for that flow and normal priority flow will avoid the paths used by high priority flows. If no disjoint paths are available, there may be two possibilities: Normal priority flows are blocked and other is, normal priority flows are allow using the coupled path with high priority flow. Blocking the normal priority flow, QoS routing protocol improves the performance of high priority flow. This concept may be use in emergency communication. Simulation results show that by assigning the priorities to flows, performance of high priority flows are improved and it will further improved by blocking the normal priority flow.
Telomeres and Telomerase: Molecular Views and Perspectives  [PDF]
Kumar Arvind, Tony Grace
Advances in Aging Research (AAR) , 2018, DOI: 10.4236/aar.2018.75008
Abstract: Telomere, the nucleoprotein structure at the end of eukaryotic linear chromosomes is indispensable for maintaining the genome stability. Telomeric DNA loss is apparent with each cell division, which marks an endpoint to the indefinite replication of the cell by causing replicative senescence that may lead to the programmed cell death. The loss of telomere is normal in cell division and as such after 20 - 40 divisions, telomere becomes too short to facilitate the capping function. Telomere uncapping or chromosomal free end causes a potential threat to the genomic stability and thus leads to the accumulation of chromosomal abnormalities that have been known to play a role in aging and cancer. Telomerase, the ribonucleoprotein complex, and its accessory proteins are required to maintain the telomere sequence. Telomerase plays a key role in maintaining the length of telomere by adding G-rich repeat sequences. Its activity has been found to be quite high in the gametes, stem cells and most importantly tumor cells. Almost 85% of tumor cells compensate for telomere loss aided by telomerase-associated protein complex and shelter in complex or telosome. However, 5% - 10% of the cells undergo telomerase-independent mechanism. This review presents the molecular view of the telomere and telomerase along with its associated complex structures. It also discusses its contrasting role in causing cellular senescence and promoting tumorigenesis.
Mixed Saddle Point and Its Equivalence with an Efficient Solution under Generalized (V, p)-Invexity  [PDF]
Arvind Kumar, Pankaj Kumar Garg
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.69145
Abstract: The purpose of this paper is to define the concept of mixed saddle point for a vector-valued Lagrangian of the non-smooth multiobjective vector-valued constrained optimization problem and establish the equivalence of the mixed saddle point and an efficient solution under generalized (V, p)-invexity assumptions.
Efficient Extraction of Agarose from Red Algae Using Ionic Liquids  [PDF]
Tushar J. Trivedi, Arvind Kumar
Green and Sustainable Chemistry (GSC) , 2014, DOI: 10.4236/gsc.2014.44025
Abstract: We explored the possibility of using ionic liquids (ILs) as medium for efficient extraction of agarose via dissolution of red algae under varying conditions of heating or microwave irradiation. As compared to conventional methods, a very high extraction yield of good quality agarose (as high as 39 wt%) could be achieved depending upon the nature of used IL and applied experimental conditions. Purity of extracted agarose was confirmed from various spectral and analytical techniques, such as 1H and 13C NMR, FTIR, circular dichroism (CD), gel permeation chromatography (GPC) and thermogravimetric analysis (TGA). The physicochemical properties, such as gelling or melting temperature, viscosity and gel strength of extracted agarose hydrogels have been measured and compared with the agarose obtained from similar source reported in the literature. ILs were recovered after the extraction of agarose and were reused for further extraction experiments. % Recycling and extraction ability of recycled ILs in different cycles have been measured. The developed extraction process of utilizing ILs as medium is easy, simple and highly efficient as compared to the conventional methods of agarose extraction from algae.
DNA marker-assisted evaluation of cultivated and local mulberry genotypes of southern India
Keshava Murthy Bengaluru Channappa,Bandekodigenahalli Marappa Prakash,Shailaja Hittalmani,Hosagavi Puttegowda Puttaraju
Crop Breeding and Applied Biotechnology , 2009,
Abstract: Germplasm evaluation is essential in any crop improvement program and genetic characterization atmorphological and molecular level is very vital for breeding programs to be successful. Twenty six cultivated and localgenotypes of mulberry were subjected to diversity analysis with RAPD markers. Among the total 31 RAPD primers studied, 24were polymorphic and 7 were monomorphic. Of the total 197 loci obtained from 24 polymorphic primers, 110 loci (55.83%)were polymorphic and 87 (44.16%) were monomorphic. A clear grouping was seen among the cultivated genotypes based onyield with varieties like S36, V1, S54 and M5 showing proximity to each other and sharing a close similarity. Local genotypesare rich reservoirs of resistant gene sources and are well acclimatized to the prevailing environmental conditions.Utilizationof these along with other high yielding varieties will produce various combinations of resistance sources which can beincorporated into high yielding varieties.
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