Oryza sativa

Resistance of upland-rice lines to root-knot nematode, Meloidogyne incognita

D. C. T. Souza, Botelho, F. B. S., Rodrigues, C. S., Furtini, I. V., Smiderle, E. C., de Matos, D. L., and Bruzi, A. T., Resistance of upland-rice lines to root-knot nematode, Meloidogyne incognita, vol. 14, pp. 17384-17390, 2015.

Despite the benefits of crop rotation, occurrence of nematodes is a common problem for almost all crops within the Cerrado biome, especially for rice. The use of resistant cultivars is one of the main methods for control of nematodes. Thus, the present study aimed to evaluate the reaction of 36 upland-rice lines, with desirable agronomic characteristics, according to their resistance to root-knot nematodes (Meloidogyne incognita). The experimental design was entirely randomized with four replications. Each plot of land consisted of two rice plants in a 3-L vase.

Natural variation of rice blast resistance gene Pi-d2

J. B. Li, Sun, Y. D., Liu, H., Wang, Y. Y., Jia, Y. L., and Xu, M. H., Natural variation of rice blast resistance gene Pi-d2, vol. 14, pp. 1235-1249, 2015.

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), tropical japonica (TRJ), aromatic (ARO); subgroups of Oryza sativa; 6 accessions of wild rice varieties; O. nivara; and O. rufipogon were analyzed.

Roles of the bZIP gene family in rice

Z. G. E, Zhang, Y. P., Zhou, J. H., and Wang, L., Roles of the bZIP gene family in rice, vol. 13. pp. 3025-3036, 2014.

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 processes that include pathogen defense; responses to abiotic stresses; seed development and germination; senescence; and responses to salicylic, jasmonic, and abscisic acids in rice.

Analysis of genetic diversity and trait correlations among Korean landrace rice (Oryza sativa L.)

F. P. Li, Lee, Y. S., Kwon, S. W., Li, G., and Park, Y. J., Analysis of genetic diversity and trait correlations among Korean landrace rice (Oryza sativa L.), vol. 13, pp. 6316-6331, 2014.

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 content (PIC) ranged from 0.0341 to 0.9358 (mean = 0.5623) and from 0.0783 to 0.9367 (mean = 0.5839), respectively.

Characterization of a rice germin-like protein gene promoter

T. Mahmood, Yasmin, T., Haque, M. I., and Naqvi, S. M. S., Characterization of a rice germin-like protein gene promoter, vol. 12. pp. 360-369, 2013.

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 present study was designed to analyze the functional importance of a root-expressed Oryza sativa GLP gene promoter (OsRGLP2).

Variation of the OsGI intron and its phenotypic associations in Oryza rufipogon Griff. and Oryza sativa L.

Y. Dong, Chen, Z., Pei, X., Wang, F., Yuan, Q., Wu, H., Jia, S., and Peng, Y., Variation of the OsGI intron and its phenotypic associations in Oryza rufipogon Griff. and Oryza sativa L., vol. 12, pp. 2652-2669, 2013.

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 dormancy were quantified in O. sativa. Three OsGI-9 band types occurred in O.

Identification of a new locus conferring antixenosis to the brown planthopper in rice cultivar Swarnalata (Oryza sativa L.)

Y. F. Qiu, Cheng, L., Liu, F., and Li, R. B., Identification of a new locus conferring antixenosis to the brown planthopper in rice cultivar Swarnalata (Oryza sativa L.), vol. 12, pp. 3201-3211, 2013.

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 locus to a 7.3-cM region on chromosome 8 in two tests, flanked by the markers RM339 and RM515.

Genome-wide multilocus analysis of intraspecific differentiation in Oryza rufipogon Griff. from China and the influence of introgression from O. sativa L.

Y. B. Dong, Li, F., Pei, X. W., Wang, F., Yuan, Q. H., Wu, H. J., Jia, S. R., and Peng, Y. F., Genome-wide multilocus analysis of intraspecific differentiation in Oryza rufipogon Griff. from China and the influence of introgression from O. sativa L., vol. 12, pp. 6103-6119, 2013.

Twenty-five populations of Oryza rufipogon from China and 144 cultivars of Oryza sativa were selected for this study. Based on the DNA fragment of Ehd1-4 and subspecies-specific sequence-tagged site markers in different chromosomes, intraspecific differentiation in O. rufipogon from China was analyzed. The introgression from O. sativa to O. rufipogon was also analyzed based on simple sequence repeat markers. The results revealed that the DNA fragment of Ehd1-4 could distinguish the O.

Incongruent evolution of chromosomal size in rice

X. Guo, Xu, G., Zhang, Y., Wen, X., Hu, W., and Fan, L., Incongruent evolution of chromosomal size in rice, vol. 5, pp. 373-389, 2006.

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.

Subscribe to Oryza sativa