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Jeevanandham Niranjanadevi Raman Renuka Ramaiah Duraisingh Senthilvel Velprabakaran Mookaiah Shanthi Jegadeesan Ramalingam 《植物病害和植物保护杂志》2023,130(1):125-141
Journal of Plant Diseases and Protection - Pragmatically, Oryza sativa L. is the most considerable food in the world and about 3 billion people rely on rice for their living sustenance and... 相似文献
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M. Vetriventhan Hari D. Upadhyaya C. R. Anandakumar S. Senthilvel R. K. Varshney Heiko K. Parzies 《Euphytica》2014,196(3):423-435
Use of diverse germplasm is a key factor which allows high level of resolution due to extensive recombination in the history. Therefore, population used in association mapping should posses as many phenotypes as possible. One of the methods to obtain most of the phenotypes is to construct the core collection. The ICRISAT foxtail millet core collection consisting of 155 accessions was genotyped using 72 simple sequence repeat (SSR) markers to investigate the genetic diversity, population structure and linkage disequilibrium (LD). A high degree of molecular diversity among the accessions was found, with an average of 16.69 alleles per locus. STRUCTURE analyses classify the accessions into four subpopulations (SP) based on SSR allelic diversity. The Neighbor joining clustering and the principal coordinate analysis were in accordance with the racial classification. The distribution of molecular genetic variation among and within the four SP and three races showed high degree of variability within each group, and low level of genetic distance (GD) among the groups. LD decay of <40 cM of GD in foxtail millet core collection was observed, which suggests that it could be possible to achieve resolution down to the 40 cM level. From this investigation, it is evident that the foxtail millet core collection developed at ICRISAT is very diverse and could be a valuable resource for trait association mapping, crop breeding and germplasm management. 相似文献
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Nalini Mallikarjuna S. Senthilvel David Hoisington 《Genetic Resources and Crop Evolution》2011,58(6):889-907
Groundnut, an important crop of many countries of the world, is susceptible to a range of diseases and pests. High levels
of resistances are not available in the cultivated gene pool as the crop is said to have a narrow genetic base. Narrow genetic
base is attributed to the evolution of the crop which took place by the combination of A and B genome species, and later doubling
their chromosome number, giving rise to tetraploid cultivated groundnut. Direct utilization of cross-compatible wild relatives,
which are diploids, to broaden the genetic base and introduction of useful traits, is not a straight-forward process due to
ploidy differences between the cultivated species and wild relatives. Hence amphiploids and autotetraploids were created by
not only combining the putative genomes, but many other A and B genome species, thus producing a highly variable population
of tetraploid groundnuts also called new sources of Arachis hypogaea. This study describes the development and characterization of newly generated tetraploid groundnuts and the level of molecular
diversity as assessed by DArT markers. 相似文献
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Mahendar Thudi Senapathi Senthilvel Andrew Bottley C. Tom Hash Arjula R. Reddy Alex F. Feltus Andrew H. Paterson David A. Hoisington Rajeev K. Varshney 《Euphytica》2010,174(2):253-260
A set of 22 pearl millet inbred lines including the parents of eleven mapping populations, was screened with 627 markers including
100 pearl millet genomic SSRs (gSSRs), 60 pearl millet EST-SSRs (eSSRs), 410 intron sequence haplotypes (ISHs), and 57 exon
sequence haplotypes (ESHs). In all, 267 (59%) of the markers were informative for at least one of the 11 mapping populations,
which segregate for traits like drought and salinity tolerance; host plant resistance to downy mildew, rust and blast; fertility
restoration and sterility and maintenance of cytoplasmic male sterility etc. An average of 116 polymorphic markers was identified
per mapping population. The average PIC values and number of profiles (P) per polymorphic marker were: gSSRs (PIC = 0.62, P = 6.1), ISHs (PIC = 0.39, P = 2.6), eSSRs (PIC = 0.36, P = 3.1) and ESHs (PIC = 0.35, P = 3.1). A high correlation (r > 0.97, P < 0.05) was observed between the patterns of diversity exposed by the different marker systems. The polymorphic markers identified
are suitable for the de novo construction, or the supplementation of pearl millet linkage maps. The genetic relationships identified among the panel of
inbred lines may be useful in designing strategies to improve the use of available genetic variation in the context of pearl
millet breeding. 相似文献
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Genetics, fertility behaviour and molecular marker analysis of a new TGMS line, TS6, in rice 总被引：1，自引：0，他引：1
The thermosensitive genic male sterility (TGMS) system has great potential for revolutionizing hybrid rice production through simple, less expensive and more efficient seed production technology. For the successful utilization of this novel male sterility system, knowledge of the breeding and fertility behaviour of a TGMS line is essential. In this study, the fertility transformation behaviour, the critical fertility and sterility temperatures and the mode of inheritance of male sterility were studied for a new TGMS line, TS6, identified at Tamil Nadu Agricultural University, Coimbatore, India. The pollen and spikelet fertilities recorded on plants raised at fortnightly intervals revealed that this line was completely sterile for 78 consecutive days (35/22 to 32/23°C, maximum/minimum temperatures) and reverted to fertile when the temperature was 30/18°C. It remained fertile continuously for 69 days and the maximum pollen and spikelet fertilities recorded were 75 and 70%, respectively. The fertility was highly influenced by daily maximum temperature followed by average and minimum temperatures. It was not influenced by relative humidity, sunshine hours or photoperiod. The critical temperature inducing sterility and fertility was 26.7 and 25.5°C, respectively. The male sterility in TS6 was inherited as a monogenic recessive in the F2 and BC1 populations of TS6 × MRST9 as well as TS6 × IR68281B. Using bulked segregant analysis on an F2 population of TS6 × MRST9, an RAPD marker, OPC052962, was identified to be associated with TGMS in TS6. 相似文献
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