Research Article

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07/30/2013
Cold tolerance; Oryza rufipogon; Oryza sativa; OsGI; Phylogenetic network; Seed dormancy

We analyzed intron 9 of the OsGI gene in Oryza rufipogon and Oryza sativa in order to investigate evolutionary relationships in rice and the relationship between intron variation and phenotype. OsGI-9 was cloned in 38 O. rufipogon populations and in 139 O. sativa cultivars and the phylogeny was reconstructed. Seed cold tolerance and ... more

Y. Dong; Z. Chen; X. Pei; F. Wang; Q. Yuan; H. Wu; S. Jia; Y. Peng
09/13/2012
Advanced backcross; Disease resistance; Oryza rufipogon; Quantitative trait loci; Rice

Advanced backcross families derived from Oryza sativa cv MR219/O. rufipogon IRGC105491 were utilized for identification of quantitative trait loci (QTL) for blast resistance using simple sequence repeat markers. Two hundred and sixty-one BC2F3 families were used to construct a linkage map, using 87 markers, which covered 2375.2 cM of 12 rice ... more

H.A. Rahim; M.A.R. Bhuiyan; L.S. Lim; K.K. Sabu; A. Saad; M. Azhar; R. Wickneswari
11/11/2014
Fine mapping; Grain weight; Near isogenic lines; Oryza rufipogon; quantitative trait locus

Grain weight is a major component of rice grain yield and is controlled by quantitative trait loci. Previously, a rice grain weight quantitative trait locus (qGW6) was detected near marker RM587 on chromosome 6 in a backcross population (BC2F2) derived from a cross between Oryza rufipogon IRGC105491 and O. sativa cv. MR219. Using a ... more

M.S. Ngu; M.J. Thomson; M.A.R. Bhuiyan; C. Ho; R. Wickneswari
11/25/2003
Cytogenetic behavior; Gene marker; Interspecific hybrids; Introgression

Controlled and natural hybridization between cassava and wild relatives does occur. Barriers within the genus appear to be weak due to recent evolution of the group. All Manihot species examined cytogenetically have a chromosome number of 2n = 36. However, they behave meiotically as diploids. The weak interspecific barriers have led to an extremely heterozygous gene pool that may begin ... more

N.M.A. Nassar
06/22/2006
Chromosomal size evolution; Genome size evolution; Incongruent patterns; Oryza sativa; Polyploidy

To investigate genome size evolution, it is usually informative to compare closely related species that vary dramatically in genome size. A whole genome duplication (polyploidy) that occurred in rice (Oryza sativa) about 70 million years ago has been well documented based on current genome sequencing. The presence of three distinct duplicate blocks from the polyploidy, of ... more

X. Guo; G. Xu; Y. Zhang; X. Wen; W. Hu; L. Fan
08/29/2013
Antixenosis; bph resistance gene; Brown planthopper [Nilaparvata lugens (Stål)]; Gene mapping; Oryza sativa

The brown planthopper [Nilaparvata lugens (Stål); BPH] has caused severe damage to rice production. The identification of resistance genes and the development of BPH-resistant varieties are economical and effective ways to manage this pest. Using an F2 population from a cross between the Indica cultivars 93-11 and Swarnalata, we mapped the Qbph-8 ... more

Y.F. Qiu; L. Cheng; F. Liu; R.B. Li
02/07/2013
Germin-like protein gene; GUS expression; Oryza sativa; Promoter; Tobacco transformation; Wounding

Germin and germin-like proteins (GLPs) are water-soluble extracellular proteins that are expressed in response to specific environmental and developmental signals. Although some enzymatic activities have also been associated with germin/GLPs, their role in overall metabolism is not fully understood. However, insight into their function may be gained by analysis of their promoter. The ... more

T. Mahmood; T. Yasmin; M.I. Haque; S.M.S. Naqvi
04/14/2014
Genetic diversity; Landrace; Oryza sativa; Population structure; Simple sequence repeat

This study analyzed 394 Korean rice landrace accessions, including 93 waxy varieties, for polymorphisms using 29 simple sequence repeat (SSR) markers. In total, 381 alleles served as raw data for estimating the genetic diversity (GD) and population structure. The number of alleles per locus ranged from 3 to 44 (average = 13.14). The expected heterozygosity and polymorphism information ... more

F.P. Li; Y.S. Lee; S.W. Kwon; G. Li; Y.J. Park
04/16/2014
bZIP; Oryza sativa; Rice; Stress response; Transcription factor

The basic leucine zipper (bZIP) genes encode transcription factors involved in the regulation of various biological processes. Similar to WRKY, basic helix-loop-helix, and several other groups of proteins, the bZIP proteins form a superfamily of transcription factors that mediate plant stress responses. In this review, we present the roles of bZIP proteins in multiple biological ... more

Z.G. E; Y.P. Zhang; J.H. Zhou; L. Wang
02/13/2015
Blast disease; Natural variation; Oryza sativa; Pi-d2; Resistance gene

Studying natural variation in rice resistance genes of cultivated and wild rice relatives can predict resistance stability to rice blast fungus. In the present study, the protein coding regions of the rice R gene Pi-d2 in 35 rice accessions, including Oryza sativa L. subsp. indica Kato (Aus), indica (IND), temperate japonica (TEJ), ... more

J.B. Li; Y.D. Sun; H. Liu; Y.Y. Wang; Y.L. Jia; M.H. Xu

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