QTL mapping for late leaf spot and rust resistance using an improved genetic map and extensive phenotypic data on a recombinant inbred line population in peanut (Arachis hypogaea L.)     

R. M. Kolekar  V. Sujay  Kenta Shirasawa  M. Sukruth  Y. P. Khedikar  M. V. C. Gowda  M. K. Pandey  R. K. Varshney  R. S. Bhat 《Euphytica》2016,209(1):147-156

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Whitebacked planthopper Sogatella furcifera (Horváth) (Homoptera: Delphacidae) resistance in rice variety Sinna Sivappu     

Kandu Ramesh  G. Padmavathi  Ram Deen  Manish K. Pandey  V. Jhansi Lakshmi  J. S. Bentur 《Euphytica》2014,200(1):139-148

Whitebacked planthopper (WBPH) along with brown planthopper (BPH) has emerged as a major pest of rice in several Asian countries. Development and cultivation of varieties resistant to both planthoppers is an ecologically acceptable strategy to manage these pests. Sinna Sivappu, a Sri Lankan landrace, was reported to be resistant to both planthoppers. While inheritance of BPH resistance has been reported, the genetics of WBPH resistance in this variety is not known. Using a mapping population of 255 F_2:3 families from Taichung Native (TN)1/Sinna Sivappu cross and 128 polymorphic simple sequence repeat (SSR) markers, genes or quantitative trait loci (QTLs) for WBPH resistance quantified in ten phenotypic tests were identified, adopting classical Mendelian segregation, correlation and QTL analyses. The inheritance pattern suggested that a single recessive gene controlled regulation of seedling damage score. Antixenosis or nymphal preference was influenced by two complementary recessive genes, whereas tolerance in terms of days to wilt was under the influence of a single dominant gene. Several of these phenotypic tests recorded high degree of positive or negative correlation between them, suggesting dependence or redundancy of the tests. QTL analysis revealed 13 loci associated with nine traits. Five major-effect QTLs were detected for damage score (chromosome 6), nymphal survival (chromosome 12), and days to wilt (three QTLs on chromosome 4). We suggest involvement of four WBPH resistance genes in Sinna Sivappu, designated as wbph9(t), wbph10(t), wbph11(t), and Wbph12(t). One of the recessive genes could be allelic to any of the recessive genes reported in cluster C on chromosome 6 which might confer resistance to both BPH and WBPH.  相似文献   

Impact of norgestomet supplementation during early luteal phase on subsequent luteal profiles and conception rate in buffalo: a preliminary study   总被引：1，自引：1，他引：0  

Anand Kumar Pandey  Gurcharan Singh Dhaliwal  Sarvpreet Singh Ghuman  Jagir Singh  Ajeet Kumar  Sudhir Kumar Agarwal 《Tropical animal health and production》2012,45(1):293-298

The current study was aimed to establish the impact of progesterone supplementation (norgestomet progestagen) between days 4 to 10 post-ovulation on subsequent luteal profile and conception rate in buffaloes. The 28 Murrah buffaloes of second to fourth parity, having normal reproductive organs, were estrus synchronized by double PGF_2α protocol at 11 days apart. The buffaloes were inseminated during mid- to late estrus and thereafter repeated at 24 h interval. The buffaloes were randomly assigned into two groups: (1) control (no treatment, n?=?14) and (2) treatment group (CRESTAR ear implant, n?=?14). The CRESTAR ear implant (3 mg, norgestomet progestagen) was inserted subcutaneous between days 4 to 10 post-ovulation. The ovaries were scanned at estrus and thereafter on days 4, 10, 16, 21, and 40 post-ovulation to examine the preovulatory follicle (POF) and corpus luteum (CL) diameter. Each ultasonography was followed by blood sample collection for analysis of plasma progesterone concentrations following ovulation. The conception rate was similar (p?>?0.05) between treated and control buffaloes. The pregnant buffalo of the control group had larger (p?<?0.05) POF diameter than nonpregnant counterparts. The CL diameter was similar (p?>?0.05) in both treated and untreated control as well as in their pregnant and nonpregnant buffaloes of the respective groups. The plasma progesterone concentrations were higher (p?<?0.05) in the treatment group on the day 10 post-ovulation as compared to the control buffaloes. It is concluded that norgestomet supplementation had no impact on conception rate and CL diameter but enhances the plasma progesterone concentrations following treatment in buffaloes.  相似文献   

Combining ability and heterosis over environments for yield and yield components in two-line hybrids involving thermosensitive genic male sterile lines in rice (Oryza sativa L.)     

S. K. Shukla    M. P. Pandey 《Plant Breeding》2008,127(1):28-32

Presence of substantial heterosis and economic hybrid seed production are two most desirable components for success of any commercial hybrid breeding programme. Thermosensitive genic male sterile (TGMS) lines of rice, in this regard, have tremendous potential in realizing further quantum jump in yield and economical hybrid seed cost. Analyses for combining ability and heterosis over optimum (120N : 60P₂O₅ : 40K₂O kg/ha) and high (200N : 90P₂O₅ : 60K₂O kg/ha) fertility environments for six traits were made in 2 years (2001 and 2002) using 120 hybrids of inter‐ and intra‐subspecific nature derived from hybridization of 30 elite indica TGMS lines and four cultivars, viz., ‘Pant Dhan 4’ and ‘Ajaya’ (I = indica), ‘Taichung 65’ (J = japonica) and ‘IR 65598‐112‐2’ (TJ = tropical japonica) in line × tester mating design. Predominance of non‐additive genetic variance suggested good prospects of hybrid breeding. Pooled analysis revealed highly significant variances for lines, general combining ability (GCA), specific combining ability (SCA) and line x tester. TGMS line 365‐8S was the best general combiner for all the six traits including grain yield. Trend of relative mid‐parent heterosis for grain yield, panicle length, grain number per panicle and earliness in flowering was I/TJ > I/J > I/I. For panicle number per plant and 1000‐grain weight, trends were I/TJ > I/I > I/J and I/I > I/TJ > I/J, respectively. Grain yield recorded heterosis of 49.3%, 71.9% and 92.7% for I/I, I/J and I/TJ hybrid groups respectively. Effect of environments on the hybrid performance indicated better response of hybrids at high fertilizer dose. Study suggests greater prospects of combining improved japonica and tropical japonica germplasms having wide compatible gene with indica TGMS lines for exploitation of intersubspecific heterosis.  相似文献   

Investigation on ion conduction behaviour in Zn-ferrite based polymer nanocomposite electrolyte     

S. L. Agrawal  Markandey Singh  Mrigank Mauli Dwivedi  Kamlesh Pandey 《Fibers and Polymers》2011,12(7):864-874

Present paper deals with, improvement in ion transport property and dielectric relaxation of polyethylene oxide (PEO)-based polymer electrolytes subsequent to dispersal of nanosized Zn-ferrite filler particles. The nanocomposite polymer electrolyte (NCPE) system [93PEO:7NH₄SCN]: x% Zn-ferrite was prepared by solution cast technique through dispersal of sol gel derived Zn-ferrite nano powder in the pristine polymer electrolyte solution. The structural and morphological behavior of NCPEs have been studied by XRD, SEM, IR and DSC measurements. Electrical conductivity (both a.c. & d.c.) measurement on nanocomposite polymer electrolyte sample have been carried out using impedance spectroscopic technique. Dielectric relaxation studies were extracted by impedance data. The hopping ion transport mechanism in NCPEs has been concluded with the help of dielectric and modulus formalism.  相似文献   

Microsatellite-based genetic monitoring to detect cryptic demographic bottleneck in Indian riverine buffaloes (<Emphasis Type="Italic">Bubalus bubalis</Emphasis>)     

Ranjit S. Kataria  Periasamy Kathiravan  Shyam S. Bulandi  D. Pandey  Bishnu P. Mishra 《Tropical animal health and production》2010,42(5):849-855

The present study was undertaken to evaluate different Indian riverine buffalo breeds (Bubalus bubalis) for mutation drift equilibrium and occurrence of any recent genetic bottleneck. A total of 330 animals from seven different breeds were analyzed with a set of 24 heterologous microsatellite markers. Three different tests revealed significant heterozygosity excess in all the seven buffalo breeds studied when assumed under infinite alleles model of microsatellite evolution, while it was the reverse with no significant heterozygosity excess when assumed under conservative stepwise mutation model. Under the two-phase model, all the buffalo breeds except Mehsana were found to be in mutation drift equilibrium when evaluated by all the three statistical methods. Standardized differences test and Wilcoxon signed-rank test revealed significant heterozygosity excess suggesting possible cryptic demographic bottleneck in Mehsana buffaloes of Western India.  相似文献   

Atmospheric deposition coupled terrestrial export of organic carbon in Ganga River (India): linking cross-domain carbon transfer to river DOC     

Jitendra Pandey  Anand V. Singh  Rachna Singh  Pooja Kaushik  Usha Pandey 《International Aquatic Research》2015,7(4):273-285

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Crop parameter estimation of Lady finger by using different neural network training algorithms     

Abhishek Pandey  J. K. Srivastava  N. S. Rajput  R. Prasad 《Russian Agricultural Sciences》2010,36(1):71-77

Now a days ANN has became an important tool in crop yield prediction and crop parameter estimation. But very few reported work is available to estimate the crop parameters by using suitable ANN Training algorithms. In the present study the crop parameters of interest are soil moisture, leaf area index and biomass were estimated using ground truth microwave scatterometer data and ANN. Two training algorithms Levenberg-Marquardt (TRAINLM) and Scaled conjugate gradient training algorithm (TRAINSCG) were used to estimate the crop parameters. The estimation of parameters with minimal error obtained with the test data confirms the usefulness of our work. Training algorithm TRAINLM shows better result in comparison to TRAINSCG. This work suggests that the ANN model with training function TRAINLM and transfer function PURELIN is a promising alternative to estimate the crop parameters. The main advantage of ANN approach as estimator is that it has the potential for world wide coverage.  相似文献   

Diversity of arbuscular mycorrhizal fungi associated with the rhizosphere of tea growing in ‘natural’ and ‘cultivated’ ecosites     

Shipra Singh  Anita Pandey  Bhaskar Chaurasia  Lok Man S. Palni 《Biology and Fertility of Soils》2008,44(3):491-500

The colonization and diversity of arbuscular mycorrhizal fungi (AMF) associated with the rhizosphere of tea [Camellia sinensis (L.) O. Kuntze] growing under ‘natural’ as well as ‘cultivated’ conditions in the Kumaun region of Uttaranchal Himalaya (India), during the periods of active growth and dormancy were investigated. Root and rhizosphere soil samples, collected from both the ecosites (natural and cultivated), were monitored for root colonization. While the percent root colonization was quite high (77.66 ± 4.40 and 86.40 ± 3.02%, in the natural and cultivated tea, respectively) during the period of active growth in both the ecosites, relatively higher colonization (97.33 ± 0.78 and 98.13 ± 0.80%, in the natural and cultivated tea, respectively) was recorded during the period of dormancy. The rhizosphere of cultivated tea bushes was found to be dominated by Glomus morhpotypes (88.89% of the total isolates) along with three morphotypes of Acaulospora; occurrence of 35 morphotypes belonging to four genera viz. Acaulospora (11.43%), Gigaspora (11.43%), Glomus (68.57%) and Scutellospora (8.57%) was recorded in the rhizosphere of tea plants from the natural ecosite. A total of 51 AMF morphotypes were detected. Shannon–Weaver index of diversity was higher (1.80 ± 0.13 and 2.05 ± 0.10 during periods of active growth and dormancy, respectively) at the species level for the natural ecosite over its counterparts from the cultivated ecosite. Values for the diversity indices of natural and cultivated ecosites did not show much variation in the period of dormancy. These data suggest that collectively, various cultural practices negatively affect AMF diversity at the genus level in tea plantations of the colder regions.  相似文献   

Towards collection of wild relatives of crop plants in India     

Anjula Pandey  Ajay Kumar Tomer  D. C. Bhandari  S. K. Pareek 《Genetic Resources and Crop Evolution》2008,55(2):187-202

A total of 373 species of wild relatives of crop plants representing 120 genera and 48 families were collected from different phytogeographical regions of India during a mission mode sub-project on Sustainable Management of Plant Biodiversity under National Agricultural Technology Project during 1999–2005. Significant diversity representing endemic/rare/endangered species has been discussed in this paper. The information on phytogeographical distribution, life form, economic types and assessment of threat has also been included. Thrust areas for future target collections and conservation have been discussed to serve as reference for management of genetic resources.  相似文献