Deletion of a Disease Resistance Nucleotide-Binding-Site Leucine-Rich- Repeat-like Sequence Is Associated With the Loss of the Phytophthora Resistance Gene Rps4 in Soybean

Sandhu, Devinder; Gao, Hongyu; Cianzio, Silvia R.; Bhattacharyya, Madan K.

doi:10.1534/genetics.104.032037

Cited by 104 publications

(81 citation statements)

References 34 publications

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“…Unequal crossing-over points were found to locate primarily within intergenic regions [83,84]. Unequal crossoverdriven gene evolution has been reported in a number of other disease resistance gene families across different plant species, including the gene families at the Arabidopsis locus RPP5 [85], the soybean (Glycine max) loci Rps [86,87] and Rsv1 [88], the lettuce (Lactuca sativa) Dm3 locus [89,90], the barley (Hordeum vulgare) Hv-elF4E locus [91], and the citrus Ctv locus [69]. Similarly, unequal crossing-over takes place in gene families other than disease resistance gene families and generates novel haplotypes and alleles at those loci [70,74,75,92].…”

Section: Unequal Crossing-overmentioning

confidence: 95%

Meiosis-Driven Genome Variation in Plants

Cai¹,

Xu²

2007

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Meiosis includes two successive divisions of the nucleus with one round of DNA replication and leads to the formation of gametes with half of the chromosomes of the mother cell during sexual reproduction. It provides a cytological basis for gametogenesis and inheritance in eukaryotes. Meiotic cell division is a complex and dynamic process that involves a number of molecular and cellular events, such as DNA and chromosome replication, chromosome pairing, synapsis and recombination, chromosome segregation, and cytokinesis. Meiosis maintains genome stability and integrity over sexual life cycles. On the other hand, meiosis generates genome variations in several ways. Variant meiotic recombination resulting from specific genome structures induces deletions, duplications, and other rearrangements within the genic and non-genic genomic regions and has been considered a major driving force for gene and genome evolution in nature. Meiotic abnormalities in chromosome segregation lead to chromosomally imbalanced gametes and aneuploidy. Meiotic restitution due to failure of the first or second meiotic division gives rise to unreduced gametes, which triggers polyploidization and genome expansion. This paper reviews research regarding meiosis-driven genome variation, including deletion and duplication of genomic regions, aneuploidy, and polyploidization, and discusses the effect of related meiotic events on genome variation and evolution in plants. Knowledge of various meiosis-driven genome variations provides insight into genome evolution and genetic variability in plants and facilitates plant genome research.

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Section: Unequal Crossing-overmentioning

confidence: 95%

Meiosis-Driven Genome Variation in Plants

Cai¹,

Xu²

2007

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“…CTAB method was used for DNA extractions (Sandhu et al, 2004). Bulked segregant analysis was used to find chromosomal location of Rht3 (Michelmore et al, 1991).…”

Section: Bulked Segregant Analysis (Bsa)mentioning

confidence: 99%

Microsatellites Based Genetic Linkage Map of the <i>Rht3</i> Locus in Bread Wheat

Navarro¹,

Yang²,

Mohan³

et al. 2014

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The wheat reduced height genes (Rht) played an important role in "The Green Revolution" by reducing damage due to lodging and making wheat more responsive to fertilizer applications. The successful use of cultivars containing Rht-B1b and Rht-D1b around the world compelled the scientist to identify and generate height mutants through induced mutation in wheat. There are manyRht genes known in wheat, however genetic and molecular characterization of many Rht genes are lacking. The Rht3 gene was originally found in the cultivar, Tom Thumb, and resulted in 46% reduction in plant height compared to the wild type allele, rht3. The objectives of our investigation were to identify SSR markers linked to Rht3 and to develop a genetic linkage map of the region containing the Rht3 gene. The Rht3 gene was located on chromosome 4B using bulked segregant analysis. Genetic linkage mapping using an F2 population placed Rht3 between markers wmc125 and gwm149 with a genetic distance of 14.4 cM and 23.6 cM, respectively. Identification of SSR markers associated with Rht3 may help breeders to more efficient screen for reduced height genes in breeding programs with diverse environmental conditions.

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“…Oomycete resistance genes include the Arabidopsis thaliana Rpp1,Rpp2,Rpp4,Rpp5,Rpp7,Rpp8, and Rpp13 genes against Hyaloperonospora parasitica (Slusarenko and Schlaich, 2003), the lettuce (Lactuca sativa) Dm3, Dm14, and Dm16 resistance genes against Bremia lactucae (Shen et al, 2002;Wroblewski et al, 2007), the potato (Solanum tuberosum) R1 (Ballvora et al, 2002), Rb (Song et al, 2003;van der Vossen et al, 2003), and R3a (Huang et al, 2005) genes against P. infestans, and the soybean Rps1k (Gao et al, 2005), Rps4, and Rps6 (Sandhu et al, 2004) genes against P. sojae.…”

Section: Introductionmentioning

confidence: 99%

RXLR-Mediated Entry of Phytophthora sojae Effector Avr1b into Soybean Cells Does Not Require Pathogen-Encoded Machinery

et al. 2008

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Effector proteins secreted by oomycete and fungal pathogens have been inferred to enter host cells, where they interact with host resistance gene products. Using the effector protein Avr1b of Phytophthora sojae, an oomycete pathogen of soybean (Glycine max), we show that a pair of sequence motifs, RXLR and dEER, plus surrounding sequences, are both necessary and sufficient to deliver the protein into plant cells. Particle bombardment experiments demonstrate that these motifs function in the absence of the pathogen, indicating that no additional pathogen-encoded machinery is required for effector protein entry into host cells. Furthermore, fusion of the Avr1b RXLR-dEER domain to green fluorescent protein (GFP) allows GFP to enter soybean root cells autonomously. The conclusion that RXLR and dEER serve to transduce oomycete effectors into host cells indicates that the >370 RXLR-dEER–containing proteins encoded in the genome sequence of P. sojae are candidate effectors. We further show that the RXLR and dEER motifs can be replaced by the closely related erythrocyte targeting signals found in effector proteins of Plasmodium, the protozoan that causes malaria in humans. Mutational analysis of the RXLR motif shows that the required residues are very similar in the motifs of Plasmodium and Phytophthora. Thus, the machinery of the hosts (soybean and human) targeted by the effectors may be very ancient.

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Deletion of a Disease Resistance Nucleotide-Binding-Site Leucine-Rich- Repeat-like Sequence Is Associated With the Loss of the Phytophthora Resistance Gene Rps4 in Soybean

Cited by 104 publications

References 34 publications

Meiosis-Driven Genome Variation in Plants

Meiosis-Driven Genome Variation in Plants

Microsatellites Based Genetic Linkage Map of the <i>Rht3</i> Locus in Bread Wheat

RXLR-Mediated Entry of Phytophthora sojae Effector Avr1b into Soybean Cells Does Not Require Pathogen-Encoded Machinery

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