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1.
A.D. Iwaro T.N. Sreenivasan P. Umaharan 《European journal of plant pathology / European Foundation for Plant Pathology》1998,104(1):11-15
Two species of Phytophthora (P. palmivora and P. capsici) and inoculations at two depths (3 mm and 9 mm) were tested each on 10 clones of Theobroma cacao to determine their effects on pod resistance. Ripe and unripe pods were also assessed to determine the influence of physiological status of the pod on the expression of resistance. The two pathogens tested (P. palmivora and P. capsici) differed significantly in their reactions on pods, with P. palmivora being more aggressive than P. capsici. However, the lack of interaction between clones and pathogen species and the similarity in the ranking of clones based on lesion size suggested that selection for resistant clones can be based on one of the two pathogens, preferably the more aggressive one. Pod reactions differed between inoculation depths (3 mm and 9 mm), and between pod maturity stages (ripe and unripe pods) with relatively larger lesions being recorded at 9 mm depth and on unripe pods as compared to those observed at 3 mm depth and on unripe pods, respectively. The magnitude of increase in lesion sizes, however, varied with genotypes, indicating that inoculation depth and pod maturity stage should be standardized in screening cacao germplasm for resistance to Phytophthora. 相似文献
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Eighteen clones involving Erianthus, as one of the parents, were evaluated in a randomised block design under sub-tropical conditions of Karnal (Haryana, India).
Fifteen characters, which contribute towards stalk yield and juice-quality, were studied. The growth of these clones was monitored
during peak winter months of December and January. Significant variability existed among the clones for all the traits studied,
except for pol % in juice at 10-month crop age, indicating potentiality of the clones to select desirable types. Nine clones
showed significant increase in stalk length during winter months over the better standard Co 1148. Whereas 6 clones developed
more number of leaves than Co 1148. Both these characters showed high genetic variability, high heritability and hence, high
expected genetic gain. Path analysis revealed that these traits contributed about 16%, 5% and 4% to the total genetic variability
in juice quality traits (pol % and CCS %), stalk yield and CCS yield, respectively. Growth in winter months has resulted in
an increase in stalk yield and CCS yield. This may help in reducing the yield gap between tropical and sub-tropical regions.
Majority of clones showed resistance to red rot disease (major disease of sugarcane in sub-tropical region). Hence, hybridization
of Erianthus with sugarcane has resulted in introgression of genes for cold tolerance and red rot resistance. As Erianthus is known for its hardiness, resistance, of these clones, to other abiotic and biotic stresses is to be ascertained.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
3.
Molecular diversity in Indian sugarcane cultivars as revealed by randomly amplified DNA polymorphisms 总被引：5，自引：0，他引：5
Genetic diversity in 28 prominent Indian sugarcane varieties cultivated under a wide range of agroclimatic conditions, was
studied using 25 RAPD markers. The mean genetic distance among the 28 varieties was only 29.31%, implying that a large part
of the genome is similar among the varieties. This probably arises from the lack of parental diversity, with few clones which
are themselves related, contributing to the parentage of these varieties. The parentage of the varieties did not contribute
significantly to the clustering pattern. Varieties belonging to the same parentage were grouped under different clusters while
varieties from different parentages were grouped under the same cluster. The tropical and subtropical identities of the varieties
also did not contribute to the clustering pattern as individual clusters included varieties from both tropics and subtropics.
This shows that genetically similar varieties are present in both the regions. Among the varieties, Co 7717 was found to be
totally
distinct and divergent from rest of the varieties. The study reveals the limited genetic base of the current Indian commercial
varieties and the need to diversify the genetic base by using new sources from the germplasm.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
4.
Identification of a diverse mini‐core panel of Indian rice germplasm based on genotyping using microsatellite markers 
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下载免费PDF全文 Kapil K. Tiwari Anshuman Singh Sasmita Pattnaik Maninder Sandhu Sukhdeep Kaur Sourabh Jain Sushma Tiwari Shweta Mehrotra Mahender Anumalla Rashmita Samal Jyoti Bhardwaj Neha Dubey Vikrant Sahu Gayle A. Kharshing Patu K. Zeliang Kadiri Sreenivasan Pankaj Kumar Swarup K. Parida Sevanthi V. A. Mithra Vandana Rai Wricha Tyagi Pawan K. Agrawal Atmakuri R. Rao Arunava Pattanayak Girish Chandel Ashok K. Singh Ishwari S. Bisht Kangila V. Bhat Gundimeda J. N. Rao Jitendra P. Khurana Nagendra K. Singh Trilochan Mohapatra 《Plant Breeding》2015,134(2):164-171
Identification of a small core germplasm set representing the available genetic diversity is essential for its proper evaluation and subsequent utilization in rice improvement programmes. For constituting a small diverse mini‐core panel of Indian rice germplasm, a representative set of 6912 accessions drawn based on their geographic origin from the whole rice germplasm collection available in the National Gene Bank was genotyped using 36 microsatellite markers. Automated fragment analysis of amplicons yielded a total of 435 alleles, with an average 12.4 and range of 3–29 alleles per locus. Polymorphism information content (PIC) ranged from 0.08 (RGNMS190) to 0.86 (RM552) with an average of 0.528. Based on genotyping data, a mini‐core consisting of 98 genotypes was identified. Ninety‐four per cent of the alleles present in the core set were present in the mini‐core. The identified small but diverse panel will be useful for further intensive trait‐specific evaluation and utilization in allele mining. 相似文献
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Matyas F Sreenivasan V Marbach F Wacongne C Barsy B Mateo C Aronoff R Petersen CC 《Science (New York, N.Y.)》2010,330(6008):1240-1243
Classical studies of mammalian movement control define a prominent role for the primary motor cortex. Investigating the mouse whisker system, we found an additional and equally direct pathway for cortical motor control driven by the primary somatosensory cortex. Whereas activity in primary motor cortex directly evokes exploratory whisker protraction, primary somatosensory cortex directly drives whisker retraction, providing a rapid negative feedback signal for sensorimotor integration. Motor control by sensory cortex suggests the need to reevaluate the functional organization of cortical maps. 相似文献
7.
A method for establishing a core collection of Saccharum officinarum L. germplasm based on quantitative-morphological data 总被引：7，自引：0，他引：7
A technique is proposed for establishing a representative core collection of S. officinarum accessions from the world collection of sugarcane germplasm maintained at the Sugarcane Breeding Institute-Research Centre, Cannanore, India. In the proposed method, the accessions were first sorted based on their relative contributions to the total variability by means of principal component scores based on a set of quantitative characters. Then, the cumulative proportion of their contributions to the total variance was computed. A logistic regression model was fitted to evaluate the functional relationship between the cumulative proportion of variance and the number of accessions. The size of the core set was decided as the inflection point on that fitted curve, i.e., the point beyond which the rate of increase in cumulative proportion of variability contributed by an accession began to decline. A method for eliminating entries with a high degree of similarity from the selected core set is also proposed. 相似文献
8.
Serological evidence for the co‐circulation of two lineages of influenza D viruses in equine populations of the Midwest United States 下载免费PDF全文
下载免费PDF全文 C. Sreenivasan M. Quast A. Singrey L. Fawcett J. Christopher‐Hennings E. Nelson R. S. Kaushik D. Wang F. Li 《Zoonoses and public health》2018,65(1):e148-e154
Influenza D virus (IDV) is a newly described influenza type of the Orthomyxoviridae virus family that was first isolated from diseased swine in 2011 and has subsequently been detected in cattle around the world in 2014. In addition, serological evidence for IDV infection in humans has been recently established. Despite all the progress, the full range of susceptible hosts for this novel virus has yet to be determined, but includes swine, bovine, small ruminants and human. This study was designed to determine if equine is a possible host to this newly emerging influenza virus. Three hundred and sixty‐four equine serum samples were collected in 2015 from 141 farms within the Midwestern United States. Serum samples were examined using hemagglutination inhibition (HI) assay against two established IDV lineages (D/OK and D/660) and one IDV‐related human ICV lineage (C/JHB). Results of this study showed 44 (44 of 364, 12%) samples positive for antibodies against D/OK, 39 (39 of 364, 11%) samples positive for antibodies against D/660, and 41 (41 of 364, 11%) samples positive for antibodies against C/JHB. A subset of these samples was further confirmed via microtitre neutralization (MN) assay. Our data demonstrated that horses are susceptible to two lineages of IDV, and that these viruses were present in equine populations throughout multiple Midwestern states of the United States. These findings continue to support the need for further surveillance of IDV viruses in agricultural species to work towards a better understanding of the full host range and natural reservoirs of influenza D virus. 相似文献
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The protection of new cork oak plantations against the larvae of the beetle Sphodroxia maroccana (Melolonthidae), which destroy the roots of newly planted trees, was provided for many years in the forest of Mamora in Morocco by the use of carbosulfan, usually formulated as dry granules for direct incorporation into the soil at planting. Ecotoxicological tests were conducted in the laboratory on S. maroccana and on two non-target beetle species, namely Pachychila obtusecostata and Pimelia platynota (Tenebrionidae), to measure the acute effects of carbosulfan and evaluate the potential risk associated with inappropriate practices. The mortality was measured at both 4 d and 7 d after ingestion of a known quantity of carbosulfan. The recommended dose by the manufacturer was exceeded by at least four-fold in the Mamora Forest, with obvious environmental risks. Risks were identified for wildlife when the pesticide is misused and spread on the soil around the plants. 相似文献