Monitoring of meteorological drought and its impact on rice (Oryza sativa L.) productivity in Odisha using standardized precipitation index     

R. Raja  A.K. Nayak  B.B. Panda  B. Lal  Rahul Tripathi  Mohammad Shahid 《Archives of Agronomy and Soil Science》2013,59(12):1701-1715

The dynamics of meteorological drought and its relationship with block level rice productivity over the Eastern Indian state of Odisha was assessed during the wet season (June to November) using the standardized precipitation index (SPI). The time series of rainfall data (1983–2008) from 168 rain gauge stations was used to derive the 1- and 3-month SPI of different wet season months. The 1- and 3-month SPI data were interpolated to map spatial patterns of meteorological drought and its severity, and the maps of a drought (2008) and normal (2007) year were discussed in detail. Further, the time series of SPI was exploited to assess the drought risk in Odisha. Correlation analysis of 1- and 3-month SPI with rice productivity index (RPI) showed that the SPI of 1-month time scale particularly in July (r = 0.49) and October (r = 0.33) had significantly stronger relationship with RPI than any of the 3-month SPI individually during wet season. The cumulative degree of severity of drought could be better explained by 3-month SPI map when drought events are well spread in the preceding months. Regression models were developed using 1- and 3-month SPI for forecasting rice productivity of blocks with varying proportion of rainfed area in Odisha. Model developed based on 1-month SPI accounted for 27% yield variability in rice and could be used for forecasting rice productivity.  相似文献   

African Potato Association     

Eugene Marshack  K. S. Krishnan  Teruzo Asahara  Eduardo Vioque  Reinhard Marcuse 《Potato Research》1988,31(4):579-579

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African Potato Association  相似文献   

Efficiency based wheat yield prediction in a semi-arid climate using surface energy budgeting with satellite observations     

Bimal K. BhattacharyaKaniska Mallick  Rahul NigamKailas Dakore  A.M. Shekh 《Agricultural and Forest Meteorology》2011,151(10):1394-1408

Accurate pre-harvest assessment of a staple food crop is an integral part of policy formulation in relation to food security issues. Here, two different approaches were attempted to estimate wheat yield using time series multi-year satellite (MODIS Aqua) optical-thermal data from a single earth observation (EO) mission. Surface energy budgeting was used to estimate evapotranspiration in terms of latent heat fluxes from net available energy and evaporative fraction to predict wheat yield over four agro-climate zones in semi-arid climate of Gujarat, India. Satellite based estimates of latent heat fluxes were found to show substantially less error with respect to the area-averaged heat flux measurements from LAS (large aperture scintillometer) as compared to measurements from BREB (Bowen Ratio Energy Balance) alone. The deviations in satellite based zonal CWU were found to have a strong correlation (r = 0.71) with the deviations from zonal wheat yield. Among both the approaches, the radiation use efficiency (RUE) based approach produced better accuracy in the predicted yield with lower root mean square error (RMSE) of 390 kg ha⁻¹ (14.8% of reported mean) and higher correlation coefficient (r = 0.92) than the water use efficiency (WUE) based approach (RMSE 573 kg ha⁻¹, 21.8% of reported mean; r = 0.80). Uncertainties in the satellite based core inputs resulted into a net 10-12% error in predicted yield in case of RUE approach. Our demonstrative case studies recommend that the coupled use of satellite observations from multiple EO missions and radiative transfer simulation would be effective to make efficiency based approaches operationally viable for regional wheat yield forecasting in near real time.  相似文献   

Immuno-histological mapping and functional association of seminal proteins in testis and excurrent ducts with sperm function in buffalo     

Sunil Kumar Patil  Lakshminarayana Somashekar  Sellappan Selvaraju  Kolatalu V. Jamuna  Shivashanmugam Parthipan  Bala Krishnan Binsila  Ramaswamy Venkatesha Prasad  Janivara Parameshwaraiah Ravindra 《Reproduction in domestic animals》2020,55(8):998-1010

The region-specific expression of seminal proteins in testis and excurrent duct system determines the quality and function of the spermatozoa. In the present study, localization and expression of some of the seminal proteins such as insulin-like growth factor receptor 1β (IGF-1Rβ), phosphatidylethanolamine-binding protein 4 (PEBP4), α-tubulin and tissue factor pathway inhibitor 2 (TFPI2) were carried out in testis, excurrent duct system and spermatozoa of buffalo. IGF-1Rβ was localized in the cells of the seminiferous tubules of the testis, except in primary spermatocytes. The PEBP4 was localized only in the elongated spermatid, whereas α-tubulin and TFPI2 proteins were localized in all cells of the seminiferous tubule including spermatocyte. In the buffalo spermatozoa, IGF-1Rβ, PEBP4, α-tubulin and TFPI2 were localized in the acrosome region, the post-acrosomal region till the tail end, post-acrosome to the entire tail region and the equatorial region, respectively. The study indicates that IGF-1R, α-tubulin and PEBP4 proteins regulate spermatogenesis, whereas TFPI2 may be involved during the zona binding process of the buffalo spermatozoa.  相似文献   

Molecular biology. Demystifying DNA demethylation   总被引：1，自引：0，他引：1  

Nabel CS  Kohli RM 《Science (New York, N.Y.)》2011,333(6047):1229-1230

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High-throughput synthesis of zeolitic imidazolate frameworks and application to CO2 capture   总被引：2，自引：0，他引：2  

Banerjee R  Phan A  Wang B  Knobler C  Furukawa H  O'Keeffe M  Yaghi OM 《Science (New York, N.Y.)》2008,319(5865):939-943

A high-throughput protocol was developed for the synthesis of zeolitic imidazolate frameworks (ZIFs). Twenty-five different ZIF crystals were synthesized from only 9600 microreactions of either zinc(II)/cobalt(II) and imidazolate/imidazolate-type linkers. All of the ZIF structures have tetrahedral frameworks: 10 of which have two different links (heterolinks), 16 of which are previously unobserved compositions and structures, and 5 of which have topologies as yet unobserved in zeolites. Members of a selection of these ZIFs (termed ZIF-68, ZIF-69, and ZIF-70) have high thermal stability (up to 390 degrees C) and chemical stability in refluxing organic and aqueous media. Their frameworks have high porosity (with surface areas up to 1970 square meters per gram), and they exhibit unusual selectivity for CO2 capture from CO2/CO mixtures and extraordinary capacity for storing CO2: 1 liter of ZIF-69 can hold approximately 83 liters of CO2 at 273 kelvin under ambient pressure.  相似文献   

Stimulation of catalase activity in carp (Cyprinus carpio) ovarian follicles by gonadotropin in vitro     

Rahul Behl 《Fish physiology and biochemistry》2006,32(3):203-207

The changes in catalase activity in carp (Cyprinus carpio) ovarian follicles at different developmental stages were investigated. The effect of follicle-stimulating hormone (FSH) on catalase activity and estradiol secretion by carp ovarian follicles was studied to establish a developmental role of catalase in folliculogenesis in fish ovary. The follicular homogenates from large follicles showed higher (9.45 ± 0.64 units/mg protein) catalase-specific activity than the small follicles (2.94 ± 0.22 units/mg protein). The FSH significantly (P < 0.05) stimulated the catalase activity in both size categories of the follicles in vitro. At the dose level of 100 ng FSH/ml culture medium, about 38 and 25% increase in catalase-specific activity was observed compared with the respective controls in small and large follicles respectively. The increase in catalase after FSH treatment was also accompanied by a similar increase in estradiol secretion. This study indicates that catalase might play a functional role in carp ovarian follicles.  相似文献   

Pyramiding of two bacterial blight resistance and a semidwarfing gene in Type 3 Basmati using marker-assisted selection     

Deepak Rajpurohit  Rahul Kumar  Mankesh Kumar  Priyanka Paul  Anjali Awasthi  P. Osman Basha  Anju Puri  Tripta Jhang  Kuldeep Singh  Harcharan Singh Dhaliwal 《Euphytica》2011,178(1):111-126

A traditional Type 3 Basmati rice cultivar grown in India is tall and lodges even under low nitrogen fertilizer dose. In addition to lodging, it is highly susceptible to several diseases and pests including bacterial blight (BB). BB resistance genes (Xa21 and xa13) and a semidwarfing gene (sd-1) were pyramided in Type 3 Basmati from a rice cultivar PR106-P2 using marker-assisted selection (MAS). Foreground selection for BB resistance genes, Xa21 and xa13 and reduced plant height gene, sd-1 was carried on the basis of linked molecular markers pTA248, RG136 and ‘h’, respectively. The BC₂F₃ progenies with both the BB resistance genes were highly resistant with lower lesion length than either of the genes individually. Background profiling of the selected 16 BC₂F₃ progenies was done using 95 anchored SSR and 12 ISSR markers. Among the selected 16 BC₂F₃ progenies, 38-5-2 and 38-5-36 closely clustered along with the recipient parent Type 3 Basmati showing above 85% genetic similarity with the same. Further selection was continued till F₅ generation for higher recovery for Type 3 Basmati characteristics. The desirable alleles of intermediate amylose content (wx) and aroma (fgr) loci of Type 3 Basmati were also tracked using the linked SSR markers. The BC₂F₅ pyramid lines T3-4, T3-5, T3-6 and T3-7 homozygous for the three target genes Xa21, xa13 and sd-1 from the donor parent with wx and fgr alleles of Type 3 Basmati had excellent cooking quality and strong aroma.  相似文献   

Identification of genomic locations associated with grain micronutrients (iron and zinc) in rice (Oryza sativa L.)     

Pippal  Amit  Bhusal  Nabin  Meena  Rahul Kumar  Bishnoi  Mahavir  Bhoyar  Pratik Istari  Jain  Rajinder K. 《Genetic Resources and Crop Evolution》2022,69(1):221-230

Genetic Resources and Crop Evolution - In this investigation, recombinant inbred lines (RILs) population derived from PAU 201 (high yielding) and Palman 579 (high iron and zinc content) varieties...  相似文献   

Magnetic properties of surface sediments in Schirmacher Oasis,East Antarctica: spatial distribution and controlling factors     

Warrier  Anish Kumar  Sebastian  Joju George  Amrutha  K.  Yamuna Sali  A. S.  Mahesh  B. S.  Mohan  Rahul 《Journal of Soils and Sediments》2021,21(2):1206-1221

Journal of Soils and Sediments - We investigated the magnetic properties (abundance, grain size, and mineralogy) of iron oxides present in Lake L-55 sediments, Schirmacher Oasis, East Antarctica,...  相似文献