Eswara Reddy N.P.,Sv Agricultural College |
Basha S.T.,Andhra University
Research Journal of Biotechnology | Year: 2013
A study was focused on the interaction of Erwinia chrysanthemi with Arabidopsis thaliana C24. Erwinia chrysanthemi has shown compatible interaction and caused soft rot by complete maceration of the tissues and collapse of the infected plant part. Inductionof random β-glucuronidase (GUS) gene fusions in transgenic Arabidopsis after infection with E. chrysanthemi was observed. Transgenic Arabidopsis lines At1082 and At1275 have shown increased GUS expression after infection with E. chrysanthemi. Histochemicalstaining results indicated localized GUS expression in the vascular bundles of the leaves present above the site of infection. DNA analysis results showed the presence of a single T-DNA copy in transgenic lines At1085 and At1275. The possibility of cloning E. chrysanthemi induced A. thaliana plant promoter sequences is discussed.
Madhumathi C.,Andhra University |
Reddi Sekhar M.,Andhra University |
Reddi Sekhar M.,Sv Agricultural College
Indian Journal of Horticulture | Year: 2015
Genetic variation in 27 sweet orange accessions was undertaken at Citrus Research Station (AICRP on Tropical Fruits), Tirupati with three replications of one tree in each accession. The observations on 32 quantitative morphological characters with respect to plant, fruit and quality characters were done following IPGRI descriptors. High GCV and PCV were recorded for seed weight (GCV = 67.24%; PCV = 74.79%) and average number of seeds per fruit (GCV = 33.83%; PCV = 34.16%). Moderate PCV and GCV values were reported for rind thickness (GCV = 19.61%; PCV = 20.39%), width of epicarp (GCV = 17.95%; PCV=20.38%), diameter of fruit axis (GCV= 15.02%; PCV = 15.61%) and fruit weight (GCV = 12.64%; PCV = 13.40%) among fruit characters. The high heritability associated with high genetic advance was observed in petiole length, leaf lamina width, anther length, pedicel length, stamen length, petal length, diameter of fruit axis, rind thickness, fruit weight, width of epicarp, average number of seeds per fruit, seed width, seed weight, ascorbic acid content, titrable acidity, total sugars, reducing sugars and ratio of soluble solids to titrable acids indicating the scope for improving these traits through selection. © 2015 Horticulture Society of India. All rights reserved.
Hariprasad K.V.,University of Reading |
Hariprasad K.V.,Sv Agricultural College |
van Emden H.F.,University of Reading
International Journal of Pest Management | Year: 2010
Artificial diet studies were used to differentiate among physical and chemical mechanisms affecting the suitability to diamondback moth (Plutella xylostella L.), of 16 food substrates obtained by growing four different brassicas in the glasshouse or field and measuring the pest's performance on either leaf discs or a diet incorporating leaf powders. Leaves of Chinese cabbage and the cabbage cultivar 'Minicole' were, respectively, the most and least suitable leaves for the insect, but this ranking was reversed on artificial diet. Leaves of glasshouse-grown plants were more suitable than those of plants grown in the fields. Differences in the suitability of leaves to diamondback moth appeared to be largely determined by leaf toughness and surface wax load. Concentrations of individual glucosinolates in the brassicas probably acted as phagostimulants, so increasing their intrinsic susceptibility to diamondback moth, but the effect of the physical factors appeared more important. © 2010 Taylor & Francis.
Nagendra Prasad B.,Sv Agricultural College |
Reddi Kumar M.,Sv Agricultural College |
Reddi Kumar M.,Acharya N.G. Ranga Agricultural University
Research Journal of Pharmaceutical, Biological and Chemical Sciences | Year: 2013
Cultural and morphological characteristics of sheath blight pathogen; Rhizoctonia solani was observed on different solid media viz., potao dextrose agar (PDA) medium, czapeck's dox agar (CDA) medium and rose bengal agar (RBA) medium. On PDA, mycelial growth was abundant, but sclerotia production was delayed. On CDA, though the mycelial growth was moderate and slower than on PDA, sclerotia production was early. On both the media, the sclerotia were aggregated. The mycelium growth was very slow on RBA and there was no sclerotia production. Scanning Electron Microscopy (SEM) of hyphal interaction between Trichoderma spp. and R. solani indicated that biocontrol agent parasitized the mycelium of R. solani. Hypha of R. solani was highly susceptible to hyphal parasitic attack by the species of Trichoderma. Studies of hyphal interaction between Trichoderma and R. solani indicates penetration of parasite and finally resulting into lysis or collapse of R. solani hypha. Among the Trichoderma spp. TK3 isolate showed more mycoprasitic activity by making contact with host hyphae, running parallel to it, production of hook like structures and emptied the cells of pathogen.
Murthy K.V.R.,Sv Agricultural College |
Reddy D.S.,Sv Agricultural College |
Reddy G.P.,Sv Agricultural College
Indian Journal of Agronomy | Year: 2012
A field experiment was conducted during 2006 and 2007 at Agricultural College, Naira on the response of rice (Oryza sativa L.) varieties to graded levels of nitrogen. Plant height, leaf area index, root volume and dry matter production were the highest with 'Vasundhara' and 120 kg N/ha at all the stages during both the years of study. Panicles/m2, filled grains/panicle, grain yield (4.51 and 4.30 t/ha) and straw yield and nitrogen uptake by grain and straw were also significantly higher in the variety 'Vasundhara'. Increasing levels of nitrogen progressively enhanced panicles/m2, filled grains/panicle, grain and straw yield and nitrogen uptake by grain and straw only up to 120 kg N/ha. Varieties and nitrogen levels interacted significantly and the highest grain yield and economics were recorded with 'Vasundhara' at 120 kg N/ha and it was found to be optimum combination for aerobic rice.
Kalyani D.L.,Sv Agricultural College
Legume Research | Year: 2012
A field experiment was conducted at S.V. Agricultural College, Tirupati, to study the effect of different sowing dates on the seed yield and quality of different varieties of guar. The experiment was laid out in a factorial randomized block design replicated thrice. Four dates of sowing viz., first and second fortnight of July and first and second fortnight of August. Genotypes are RGC 1003, HG 563, RGM 112 and GAUG 9703. The results were revealed that growth parameters, yield attributes, yield and quality parameters were highest with RGM 112 sown during first fortnight of July, which was at par with HG 563 sown at the same time.
Bhagavatha Priya T.,Sv Agricultural College |
Subramanyam D.,Sv Agricultural College |
Sumathi V.,Sv Agricultural College
Indian Journal of Agricultural Research | Year: 2016
A field experiment was conducted in sandy loam soils to study the performance of groundnut cultivars (Abhaya, TAG-24, Dharani and Kadiri-6) under different plant populations (3.33, 4.44, 5.00 and 6.66 lakh ha-1) during early kharif, 2013, at Sri Venkateswara Agricultural College Farm, Tirupati campus of Acharya N.G. Ranga Agricultural University, Andhra Pradesh. The results revealed that the highest stature of yield attributes viz., number of filled pods plant-1, pod to peg percentage, hundred pod and kernel weight were significantly higher with groundnut variety Dharani compared to rest of the varieties due to better partitioning of photosynthates to sink. The groundnut cultivar Dharani recorded 42.0, 32.2 and 17.0 per cent higher pod yield compared to Abhaya, Kadiri-6 and TAG-24, respectively. All the yield components were significantly higher with plant population of 3.33 lakh ha-1. The pod yield of groundnut with plant population of 5.00 lakh ha-1 was increased by 2.8, 7.2 and 14.0 per cent compared to 3.33, 4.44 and 6.66 lakh ha-1, respectively. The higher pod yield of groundnut during early kharif in sandy loam soil was obtained with groundnut cultivar Dharani at plant population of 5.00 lakh ha-1.
Naidu G.M.,Sv Agricultural College |
Kumari V.M.,Sv Agricultural College |
Srikala V.,Sv Agricultural College
Plant Archives | Year: 2014
The present study was conducted to know the statistical investigation of arrivals and price behaviour of red chillies (Capsicum annuum) in Khammam and Warangal markets of Andhra Pradesh, India. Purposive sampling was used to select the markets. In both the markets, the highest and the lowest arrivals of seasonal indices were observed during the month of March and November, respectively. On the other hand, in Khammam market the highest price was observed during the month of March while it was lowest in September. In case of Warangal market, the highest and lowest prices were observed during the month of January and October, respectively. Well defined cycles could not be observed during the study period in both markets. The forecasted arrivals and prices in both the markets differed during the study period. A significant relation between arrivals and prices was observed during the period in both the markets.
Kumari C.R.,Sv Agricultural College |
Reddy D.S.,Sv Agricultural College |
Vineetha U.,Sv Agricultural College
Legume Research | Year: 2010
Field experiment was conducted in the wetland farm of for during 2002-2003 and 2003-2004 to investigate the cumulative residual effect of incorporated crop residues and different nitrogen management practices applied to preceding lowland rice on the performance of succeeding groundnut. Incorporation of fieldbean crop residues and supply of 100 per cent N through FYM to rice was superior to any other crop residue incorporation and nitrogen management practices adopted. Similar magnitude of performance of groundnut was noticed with the combination of fieldbean crop residue incorporation and supply of 50 per cent nitrogen each through fertilizer and FYM to preceding rice.
Mathews A.A.,Sv Agricultural College |
Basha S.T.,Sv Agricultural College |
Reddy N.P.E.,Sv Agricultural College
Journal of Pure and Applied Microbiology | Year: 2011
Management of anthracnose, a post harvest disease of mango (Mangifera indica L.) incited by Colletotrichum gloeosporioides (Penz.) Penz. & Sacc. was produced by using native antagonistic microflora. Under in vitro study, the Trichoderma isolates Trichoderma fasciculatum and Trichoderma koningii showed the highest antagonistic activity against Colletotrichum gloeosporioides in dual culture isolated from fructoplane and phylloplane respectively. T.fasciculatum proved to be the best compatible antagonist with different fungicides evaluated. In vivo screening of potential antagonist T.fasciculatum on mango fruits revealed that post-inoculation (pre-treatment) method is superior over the pre-inoculation method in management of anthracnose disease. The possibility of exploitation of fungicidal compatible bioagent in the integrated management of anthracnose with low fungicidal residue will delay in development of resistance in the pathogen will be discussed.