Changes in vasotocin levels in relation to ovarian development in the catfish Heteropneustes fossilis exposed to altered photoperiod and temperature     

Radha Chaube  Rahul Kumar Singh  Keerikattil P. Joy 《Fish physiology and biochemistry》2015,41(5):1173-1186

  相似文献   

Multivariate analysis and genetic diversity for morphometric and root textural quality traits in ashwagandha (Withania somnifera Dunal)     

R. Ramesh Kumar  L. Prasanna Anjaneya ReddyJ. Vinay Kumar  K. KomaraiahS. Purnanand  K.P. Sastry 《Industrial Crops and Products》2012,35(1):199-202

Ashwagandha (Withania somnifera) is an important medicinal plant and its dried roots are used in traditional systems of medicine. The market price of roots is determined by physical (textural) quality. Brittle roots with high starch and low fiber are considered to be superior because of ease in grinding. Genetic diversity studies based on root textural parameters have not been done so far. So the present study was designed to assess genetic diversity for morphometric traits and root textural quality parameters among two morphologically distinct groups: Poshita and Nagore. The PCA separated the morphometric and root texture variables distinctly into two different principal components: PC-1 and PC-2 respectively, indicating that both are negatively associated. All the morphotypes in Poshita group showed high positive loadings in PC-1 indicating that component genotypes are high root yielding. Nagore morphotypes were low yielding but the root texture was good. Clustering of morphotypes grouped Poshita and Nagore separately with high inter-cluster distances indicating that both groups are highly divergent from each other, suggesting that there is sufficient scope for varietal improvement through hybridization.  相似文献   

Marker assisted selection of Ty-2 and Ty-3 carrying tomato lines and their implications in breeding tomato leaf curl disease resistant hybrids     

H. C. Prasanna  Sarvesh P. Kashyap  Ram Krishna  D. P. Sinha  Suresh Reddy  V. G. Malathi 《Euphytica》2015,204(2):407-418

  相似文献   

Genetic variability for resistance to sorghum downy mildew (Peronosclerospora sorghi) and Rajasthan downy mildew (P. heteropogoni) in the tropical/sub-tropical Asian maize germplasm     

Tran Thi Oanh Yen  B.M. Prasanna  T.A.S. Setty  R.S. Rathore 《Euphytica》2004,138(1):23-31

Downy mildews cause considerable damage to maize (Zea mays L.) worldwide, particularly in the tropical Asia. We have evaluated a set of 42 tropical/sub-tropical maize inbred lines developed in different countries in Asia (India, Thailand and Philippines), and Mexico, for analysing the genetic variability for resistance to sorghum downy mildew [Peronosclerospora sorghi; SDM] and Rajasthan downy mildew [P. heteropogoni; RDM]. Experiments were carried out in replicated trials under artificial infection in field conditions against SDM and RDM at Mandya in Karnataka, India, and Udaipur in Rajasthan, India, respectively, during 1999 and 2000. The study resulted in identification of five inbred lines offering consistent and strong resistance to both SDM and RDM, while several inbred lines revealed resistance only to RDM. It was also revealed that the SDM-resistant inbreds are invariably resistant to RDM, while the RDM-resistant inbreds might show differential responses to the SDM. The maize inbred lines identified in this study with broad-spectrum resistance to downy mildews could be potentially useful for basic and applied research work on downy mildews in tropical Asia. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

Growth potential and biocide tolerance of non-heterocystous filamentous cyanobacterial isolates from rice fields of Uttar Pradesh, India     

O. Tiwari  R. Prasanna  A. Yadav  Wattal D. Dhar  P. Singh 《Biology and Fertility of Soils》2001,34(4):291-295

Twenty-eight non-heterocystous filamentous cyanobacterial strains were isolated from different locations in the rice fields of Uttar Pradesh. These strains belonged to seven genera, namely Pseudanabaena, Limnothrix, Phormidium, Microcoleus, Plectonema, Lyngbya and Oscillatoria. A wide variation was observed in these strains with respect to dry weight, generation time and tolerance to biocides. Lyngbya palmarum and Oscillatoria acuminata showed maximum biomass (dry weight), while Pseudanabaena frigidum, Phormidium foveolarum, O. acuminata, Lyngbya palmarum and Lyngbya spiralis showed a significantly shorter generation time as compared to other strains studied. An interesting feature observed was that these non-heterocystous filamentous cyanobacteria possessed a remarkable tolerance to the biocides 2,4-dichlorophenoxyacetic acid, Malathion and Dimecron, at doses much higher than those recommended for rice crops.  相似文献   

Advanced Irrigation Engineering： Precision and Precise   总被引：1，自引：0，他引：1  

Terry  A.  Howell Steven  R.  EveR Susan  A.  O＇  Shaughnessy Paul  D.  Colaizzi Prasanna  H.  Gowda 《农业科学与技术》2012,(1):1-9

  相似文献   

Regeneration of tree species in the sub-tropical forest of Alaknanda Valley, Garhwal Himalaya, India     

Radha BALLABHA  J. K. TIWARI  P. TIWARI 《中国林学(英文版)》2013,15(2):89-97

We studied the regeneration of tree species in the sub-tropical forest of Alaknanda Valley in Garhwal Himalaya, India. The overall regeneration status was fairly good in the study area. Seedling density ranged between 520 and 1,240 seedlings per ha while the density of saplings varied between 400 and 800 saplings per ha. Out of eight sites studied, five sites, viz., A1 , A2 , B1 , B2and C2contained the highest number of seedlings (280-480 per ha) and saplings (200-440 per ha) for Pinus roxburghii and remaining three sites viz., C1, D1and D2represented the highest number of seedlings (240-400 per ha) and saplings (200-240 per ha) for Anogeissus latifolius. The DBH class distribution of the tree species revealed that the highest number of individuals was concentrated in the lower diameter classes while smallest numbers were found in the higher diameter classes. Species such as Acacia catechu, Anogeissus latifolius, Dalbergia sissoo, Engelhardtia spicata, Lannea coromandelica, Mallotus philippensis and Pinus roxburghii have the largest number of saplings and seedlings in the lower DBH classes, suggesting that they have good regeneration potential. Other species such as Aegle marmelos, Bauhinia variegata, Bombax ceiba, Cassia fistula, Erythrina variegata, Haldinia cordifolia, Mangifera indica, Ougeinia oojeinensis, Phyllanthus emblica, Syzygium cumini, Terminalia alata and Toona hexandra have either no or very small number of saplings in the lower DBH classes, which indicates that the status of these species implies poor regeneration.  相似文献   

First Authenticated Case of Sri Lankan Flying Snake (Chrysopelea taprobanica) Bite     

Anjana Silva  Prasanna Weerawansa  Senaka Pilapitiya  Thilina Maduwage  Sisira Siribaddana 《The Forestry Chronicle》2013,24(3):273-276

  相似文献   

Combining ability for rancidity and associated traits in pearl millet (Pennisetum glaucum)     

Mandalapu Pallavi  Pulluru Sanjana Reddy  Chamarthy Venkata Ratnavathi  Kancharla Venkata Radha Krishna 《Plant Breeding》2023,142(3):345-356

Pearl millet occupies an important place in attaining nutritional security in marginal areas; however, as it develops off-flavours, it is less preferred by food industry. The objective of the current study was to determine the variations in rancidity-related traits and estimate the combining ability of inbreds and hybrids for these traits under varied environmental conditions. In this study, 32 hybrids were developed from eight lines and four testers using line × tester mating design and evaluated along with parents and checks 86M86 and HHB 67 for yield and rancidity-associated traits in three environments. The hybrids L7T2 and L6T1 are identified as promising hybrids for grain yield and rancidity. Higher variance due to specific combining ability and predictability ratio for grain yield and rancidity-associated characters indicate the predominance of non-additive gene action. The tester T1 recorded a significant negative GCA effect with low alcoholic acidity. A significant and positive SCA for grain yield was observed in L3T1 and L7T2, whereas for rancidity in L5T4. Alcoholic acidity showed a significant positive association with 1000 seed weight, lipase and lipoxygenase in parents and negative association with 1000 seed weight in hybrids.  相似文献   

Evaluation of housekeeping genes as references for quantitative real-time PCR analysis of gene expression in the murrel <Emphasis Type="Italic">Channa striatus</Emphasis> under high-temperature stress     

Gopal Krishna Purohit  Arabinda Mahanty  Bimal Prasanna Mohanty  Sasmita Mohanty 《Fish physiology and biochemistry》2016,42(1):125-135

Quantitative real-time polymerase chain reaction is the most advanced method of quantifying gene expression studies; however, the significance of the obtained results strongly depends on the normalization of the data to compensate for differences between the samples. In the present study, expression analysis of six different constitutively expressed genes viz. 18S ribosomal RNA, glyceraldehyde-3-phosphate dehydrogenase (gapdh), beta actin (βactin), ribosomal binding protein L13, tubulin and TATA-box-binding protein (tbp) were carried out to test their efficacy as reference genes in three different tissues, namely liver, gill and muscle of murrel Channa striatus exposed to high temperature for variable time periods. The stability and suitability of the genes were determined by using bioinformatic tools: GeNorm, NormFinder and BestKeeper. Based on the results, tub/βactin could be used as the reference genes for liver and gill tissues and βactin/gapdh could be the reference genes for muscle tissues in Channa striatus under both short- and long-term thermal stress.  相似文献