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Multidimensional evaluation of salt tolerance in groundnut genotypes through biochemical responses

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Oil Crop Science 2024年第2期9卷 102-110页

作者： Rushita D.Parmar Vaishali G.Varsani Vijay Parmar suhas Vyas Dushyant Dudhagara Department of Life Sciences Bhakta Kavi Narsinh Mehta UniversityJunagadhGujaratIndia

The manuscript explores the complex interplay between groundnut genotypes,salt tolerance and hormonal influence,shedding light on the dynamic responses of three specific groundnut genotypes,KDG-128,TG-37 A and GG-20,to salt treatments and gibberellic acid(GA3).The study encompasses germination,plant growth,total protein content and oil content as key *** comprehensive analysis,it identifies TG-37 A and KDG-128 as salt-tolerant genotypes,and GG-20 as salt-susceptible genotypes,which highlighting the potential for targeted breeding efforts to develop more resilient groundnut ***,the quantification of protein and oil content under different treatments provides vital data for optimizing nutritional profiles in groundnut *** Component Analysis(PCA) underscores the significance of the first principal component(PC1)in explaining the majority of variance,capturing primary trends and differences in plant *** of Variance(ANOVA) and hierarchical analysis confirm the presence of statistically significant differences in protein and oil content among the ***'s correlation coefficient matrix analysis reveals strong positive correlations between plant length and protein content,plant length and oil content,and a moderately positive correlation between protein content and oil *** findings provide valuable insights into groundnut physiology,salt tolerance,and nutritional composition,with implications for future research in sustainable agriculture and crop improvement.

关键词： Groundnut Salt tolerance Genotypes Salt-hormone interaction Protein and oil content Statistical analysis

Modelling effect of magnetic field on material removal in dry electrical discharge machining

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Plasma Science and Technology 2017年第2期19卷 79-88页

作者： Abhishek GUPTA suhas S JOSHI Department of Mechanical Engineering Indian Institute of Technology BombayPowaiMumbai 400 076India

One of the reasons for increased material removal rate in magnetic field assisted dry electrical discharge machining （EDM） is confinement of plasma due to Lorentz forces. This paper presents a mathematical model to evaluate the effect of external magnetic field on crater depth and diameter in single- and multiple-discharge EDM process. The model incorporates three main effects of the magnetic field, which include plasma confinement, mean free path reduction and pulsating magnetic field effects. Upon the application of an external magnetic field, Lorentz forces that are developed across the plasma column confine the plasma column. Also, the magnetic field reduces the mean free path of electrons due to an increase in the plasma pressure and cycloidal path taken by the electrons between the electrodes. As the mean free path of electrons reduces, more ionization occurs in plasma column and eventually an increase in the current density at the inter-electrode gap occurs. The model results for crater depth and its diameter in single discharge dry EDM process show an error of 9%-10% over the respective experimental values.

关键词： electrical discharge machining dry EDM plasma confinement magnetic field

Dynamics of sea-ice biogeochemistry in the coastal Antarctica during transition from summer to winter

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Geoscience Frontiers 2017年第3期8卷 507-516页

作者： suhas Shetye Babula Jena Rahul Mohan National Institute of Oceanography Donapaula Goa 403004 India National Centre for Antarctic and Ocean Research Headland Sada Goa 403 804 India

The seasonality of carbon dioxide partial pressure （pC02）, air-sea CO2 fluxes and associated environ- mental parameters were investigated in the Antarctic coastal waters. The in-situ survey was carried out from the austral summer till the onset of winter （January 2012, February 2010 and March 2009） in the Enderby Basin. Rapid decrease in pCO2 was evident under the sea-ice cover in January, when both water column and sea-ice algal activity resulted in the removal of nutrients and dissolved inorganic carbon （DIC） and increase in pH. The major highlight of this study is the shift in the dominant biogeochemica/ factors from summer to early winter. Nutrient limitation （low Si/N）, sea-ice cover, low photosynthetically active radiation （PAR）, deep mixed layer and high upwelling velocity contributed towards higher pCO2 during March （early winter）. CO2 fluxes suggest that the Enderby Basin acts as a strong CO2 sink during January （-81 mmol m-2 d 1）, however it acts as a weak sink of CO2 with -2.4 and -1.7 mmol m 2 d-1 during February and March, respectively. The present work, concludes that sea ice plays a dual role towards climate change, by decreasing sea surface pCO2 in summer and enhancing in early winter. Our observations emphasize the need to address seasonal sea-ice driven CO2 flux dynamics in assessing Antarctic contributions to the global oceanic CO2 budget.

关键词： pCO2 fluxes Upwelling Antarctica Sea-ice

Phytoplankton abundance and community structure in the Antarctic polar frontal region during austral summer of 2009

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Chinese Journal of Oceanology and Limnology 2013年第1期31卷 21-30页

作者： SHRAMIK Patil RAHUL Mohan suhas Shetye SAHINA Gazi National Centre for Antarctic and Ocean Research

The Antarctic polar front region in the Southern Ocean is known to be most productive. We studied the phytoplankton community structure in the Indian sector at this frontal location during late austral summer (February, 2009) onboard R/V Akademic Boris Petrov. We used the phytoplankton and microheterotrophs abundance, as also the associated physico-chemical parameters to explain the low phytoplankton abundance in the study region. This study emphasizes the shift of phytoplankton, from large (>10 μm) to small (10 μm) phytoplankton abundance during the late austral summer. This study highlights the highly productive polar front nevertheless becomes a region of low phytoplankton abundance, due to community shifts towards pico-phytoplankton (<10 μm) during late austral summer.

关键词： Southern Ocean polar front diatom ciliate dinoflagellate

Secondary Calcification of Planktic Foraminifera from the Indian Sector of Southern Ocean

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Acta Geologica Sinica(English Edition) 2015年第1期89卷 27-37页

作者： Rahul MOHAN suhas S.SHETYE Manish TIWARI Narayanpillai ANILKUMAR National Centre for Antarctic and Ocean Research National Institute of Oceanography

This study focused on planktic foraminifera in plankton tows and surface sediments from the western Indian sector of Southern Ocean in order to evaluate the potential foraminiferal secondary calcification and/or dissolution in the sediment. It is found that the symbiotic foraminiferal species are abundant in the subtropical region, whereas non-symbiotic species dominate in the sub-Antarctic and polar frontal regions. The distribution of the symbiotic and non-symbiotic foraminiferal species is controlled by temperature, salinity, light, nutrients and phytoplankton biomass. There is also a lateral southern extent in abundance of planktic foraminifera from surface sediments to plankton tows. The shell weights of the planktic foraminifera N. pachyderma, G. bulloides and G. ruber within the surface sediments are on an average heavier by 27%, 34% and 40% respectively than shells of the same size within the plankton tows, indicative of secondary calcification. The planktic foraminiferal isotopes show the presence of heavier isotopes in the surface sediment foraminifera as compared to plankton tows, thus confirming secondary calcification. Secondary calcification in G. ruber occurs in the euphotic zone, whereas in case of N. pachyderma and G. builoides it is at deeper depths. We also observed a decrease in the shell spines in surface sediment foraminifera as compared to plankton tows, indicative of the morphological changes that foraminifera underwent during gametogenesis.

关键词： Southern Ocean foraminifera climate change stable isotopes shell weight

Contrasting Productivity and Redox Potential in Arabian Sea and Bay of Bengal

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Journal of Earth Science 2014年第2期25卷 366-370页

作者： suhas S Shetye Maruthadu Sudhakar Rahul Mohan Babula Jena National Centre for Antarctic & Ocean Research Ministry of Earth Sciences

Understanding the past and present changes is critical for evaluating the future climatic changes. In order to understand the paleoproductivity and depositional environments of Northern In- dian Ocean, two sediment cores were collected, one each from the Arabian Sea （lat. 16°51.40′N and long. 71°54.37′E, water depth 803 m） and the Bay of Bengal （lat. 13°05.35′N and long. 91°28.21′E, wa- ter depth 3 054 m）. The surface seawater samples indicate higherpCO2 values in Arabian Sea as com- pared to the Bay of Bengal. The sediment organic carbon variations along with sedimentological and other geochemical parameters were studied. Sediment organic carbon varied from 0.5%--4.7% and 0.3%-1.22% in Arabian Sea and the Bay of Bengal, respectively. In Arabian Sea, low productivity, oxic conditions and less intense southwest monsoon prevailed during the deglacial period, whereas productivity has increased from last 16 kyr to the modern age. In the Bay of Bengal, organic carbon decreased from the Last Glacial Maxima （LGM） to the modern age, indicating higher productivity in the past as compared to modern age. Fe was associated with organic carbon in the Bay of Bengal and increased during LGM, showing similar trend to that of organic carbon, indicating that Fe may be the limiting factor for the growth of phytoplankton in the Bay of Bengal in the modern age. In the Bay of Bengal, Mn is enriched during modern age and is depleted during LGM, whereas chromium showed the opposite trend indicating anoxic conditions during the LGM, whereas in Arabian Sea the trends are opposite to the Bay of Bengal.

关键词： paleoproductivity geochemical deglacial organic carbon.

Fluid-structure interaction based optimisation in tidal turbines:A perspective review

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Journal of Ocean Engineering and Science 2022年第5期7卷 449-461页

作者： Siddharth suhas Kulkarni Lin Wang Nicholas Golsby Martin Lander School of Mechanical Aerospace and Automotive EngineeringCoventry UniversityCoventry CV12JHUnited Kingdom

Occurrences such as the global climate change have presented critical challenges to humanity and necessitated studies into how greenhouse gas emissions can be *** practical solution is the generation of power from renewable and sustainable sources;hence,tidal current energy which,however,also gives rise to the concept of fluid-structure interaction(FSI).The pressure and fluid flow aspects affect the structural deformations and the structural deformations in turn affect pressure and *** paper presents a perspective review of FSI based optimisation in tidal turbines with a focus on low-order aerodynamic,computational fluid dynamics(CFD)and structural *** was acknowledged that,to aid humanity amidst the issue of using renewable or non-renewable sources of energy,practical solutions such as generating renewable energy from sustainable sources are *** current energy was found to be one of the most reliable solutions but further studies regarding its practicality was advised.

关键词： tidal greenhouse Tidal

Base editing in plants: Current status and challenges

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The Crop Journal 2020年第3期8卷 384-395页

作者： Sutar suhas Bharat Shaoya Li Jingying Li Lei Yan Lanqin Xia Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081China

Genome editing technologies have revolutionized the field of plant science by enabling targeted modification of plant genomes and are emerging as powerful tools for both plant gene functional analyses and crop improvement. Although homology-directed repair(HDR)is a feasible approach to achieve precise gene replacement and base substitution in some plant species, the dominance of the non-homologous end joining pathway and low efficiency of HDR in plant cells have limited its application. Base editing has emerged as an alternative tool to HDR-mediated replacement, facilitating precise editing of plant genome by converting one single base to another in a programmable manner without a doublestranded break and a donor repair template. In this review, we summarize the latest developments in base-editing technologies as well as their underlying mechanisms. We review current applications of these technologies in plant species. Finally, we address the challenges and future perspectives of this emerging technology in plants.

关键词： Base editing in plants Current status and challenges

Variability of Nonionellina labradorica Dawson in Surface Sediments from Kongsfjorden,West Spitsbergen

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Acta Geologica Sinica(English Edition) 2011年第3期85卷 549-558页

作者： suhas SHETYE Rahul MOHAN Sunil Kumar SHUKLA Sudhakar MARUTHADU Rasik RAVINDRA National Centre for Antarctic and Ocean Research Goa India Ministry of Earth Sciences New Delhi India

Kongsfjorden is a fjord in Spitsbergen（Svalbard archipelago）that lies adjacent to both Arctic and Atlantic water masses and is therefore a suitable site to understand the effects of climate change on *** decipher the effect of the lateral advection of transformed Atlantic water （TAW）within the fjord,spatial variations of foraminiferal tests,their test size variations and stable isotopic composition（δ^（13）C andδ^（18）O）in the surface sediments were *** organic carbon and textural analyses were also carried *** dominant benthic foraminifera included Nonionellina labradorica,Elphidium excavatum,Cassidulina reniforme,Quinqueloculina stalkeri and Islandiella *** labradorica was the predominant species in the outer fjord,whereas Elphidium excavatum and Cassidulina reniforme were dominant in the inner *** organic carbon and the test size of Nonionellina labradorica within the fjord were highly correlated（r=0.97）and both showed a decreasing trend towards the inner *** on the distribution and abundance of Nonionellina labradorica as well as temperature profiles,we suggest that there was little or no major change in the lateral advection of TAW within the fjord in the immediate past.

关键词： West Spitsbergen Current Kongsfjorden Nonionellina labradorica grain size organic carbon stable isotopes temperature