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https://hdl.handle.net/2440/83143
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Type: | Journal article |
Title: | Molecular marker survey and expression analyses of the rice submergence-tolerance gene SUB1A |
Author: | Singh, N. Dang, T. Vergara, G. Pandey, D. Sanchez, D. Neeraja, C. Septiningsih, E. Mendioro, M. Tecson-Mendoza, E. Ismail, A. MacKill, D. Heuer, S. |
Citation: | Theoretical and Applied Genetics: international journal of plant breeding research, 2010; 121(8):1441-1453 |
Publisher: | Springer |
Issue Date: | 2010 |
ISSN: | 0040-5752 1432-2242 |
Statement of Responsibility: | Namrata Singh, Trang T. M. Dang, Georgina V. Vergara, Dev Mani Pandey, Darlene Sanchez, C. N. Neeraja, Endang M. Septiningsih, Merlyn Mendioro, Evelyn Mae Tecson-Mendoza, Abdelbagi M. Ismail, David J. Mackill, Sigrid Heuer |
Abstract: | The major rice quantitative-trait locus Submergence 1 (Sub1) confers tolerance of submergence for about 2 weeks. To identify novel sources of tolerance, we have conducted a germplasm survey with allele-specific markers targeting SUB1A and SUB1C, two of the three transcription-factor genes within the Sub1 locus. The objective was to identify tolerant genotypes without the SUB1A gene or with the intolerant SUB1A-2 allele. The survey revealed that all tolerant genotypes possessed the tolerant Sub1 haplotype (SUB1A-1/SUB1C-1), whereas all accessions without the SUB1A gene were intolerant. Only the variety James Wee with the SUB1A-2 allele was moderately tolerant. However, some intolerant genotypes with the SUB1A-1 allele were identified and RT-PCR analyses were conducted to compare gene expression in tolerant and intolerant accessions. Initial analyses of leaf samples failed to reveal a clear association of SUB1A transcript abundance and tolerance. Temporal and spatial gene expression analyses subsequently showed that SUB1A expression in nodes and internodes associated best with tolerance across representative genotypes. In James Wee, transcript abundance was high in all tissues, suggesting that some level of tolerance might be conferred by high expression of the SUB1A-2 allele. To further assess tissue-specific expression, we have expressed the GUS reporter gene under the control of the SUB1A-1 promoter. The data revealed highly specific GUS expression at the base of the leaf sheath and in the leaf collar region. Specific expression in the growing part of rice leaves is well in agreement with the role of SUB1A in suppressing leaf elongation under submergence. |
Keywords: | Seeds Water Glucuronidase Plant Proteins Genetic Markers Survival Analysis Gene Expression Profiling Adaptation, Physiological Organ Specificity Gene Expression Regulation, Plant Amino Acid Sequence Base Sequence Haplotypes Alleles Genes, Plant Time Factors Molecular Sequence Data Promoter Regions, Genetic Oryza Seedlings |
Rights: | © Springer-Verlag 2010 |
DOI: | 10.1007/s00122-010-1400-z |
Published version: | http://dx.doi.org/10.1007/s00122-010-1400-z |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest |
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