Inheritance of Resistance to Grassy Stunt Virus and Its Vector in Rice

Khush, G. S.; Ling, K. C.

doi:10.1093/oxfordjournals.jhered.a108483

Cited by 52 publications

(16 citation statements)

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“…Major genes for resistance to grassy stunt virus have been transferred from O. nivara to cultivated rice. Similarly, genes for bacterial blight resistance from O. longistaminata were transferred to cultivated rice by conventional breeding methods (Khush et al 1977; Jena & Kush 1990). The other wild species make up the secondary gene pool.…”

Section: Introductionmentioning

confidence: 99%

Analysis of genetic variability of South American wild rice populations (Oryza glumaepatula) with isozymes and RAPD markers

1998

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The knowledge of population structure and genetic diversity of wild relatives of rice is needed to investigate their evolutionary history and potential use in breeding programs. Very little is known about the wild rice species (Oryza spp.), particularly those that are native to South America. A study using isozyme and RAPD markers was conducted to estimate the level of genetic diversity of four South American wild rice populations (Oryza glumaepatula) recently collected in the Amazon forest and western Brazil rivers. F‐statistics and genetic diversity parameters calculated from isozyme and RAPD markers indicated high values for inbreeding coefficients and differentiation among the four populations. In agreement with this, a pattern of greater variation between than within populations was observed with both types of markers. These findings were corroborated by an AMOVA analysis, which indicated that a large portion of the total genetic variation was attributed to regional divergence. The partition of the AMOVA analysis among populations showed that most of the genetic diversity was due to differences among populations. This distribution pattern of genetic variation of O. glumaepatula populations is in agreement with the expectation for an autogamous species and provides important baseline data for conservation and collection strategies for this species.

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Section: Introductionmentioning

confidence: 99%

Analysis of genetic variability of South American wild rice populations (Oryza glumaepatula) with isozymes and RAPD markers

1998

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“…Several of them have been already transferred into the cultivated rice varieties. For instance, landmark introgression from wild Oryza genus including resistance to grassy stunt virus (Khush and Ling 1974), bacterial leaf blight resistance gene Xa-21 (Khush et al 1990), blast resistance genes Pi-9 (Amante-Bordeos et al 1992), Pi-40(t) (Jeung et al 2007), brown plant hopper resistance (Li et al 2006, Yan et al 1997 and L-myo-inositol 1phosphate synthase gene for salt tolerance (Das-Chatterjee et al 2006) had a profound impact on rice cultivation at global scale. To further intensify the search of novel genes and allele present in the wild relatives of rice, in 2007, IOMAP (International Oryza Map Alignment Project) was initiated with a goal to generate genomic information on wild relative of rice that can be used as a research platform to study evolution, development, genome organization, polyploidy, domestication, gene regulatory networks and crop improvement (Wing et al 2005).…”

Section: Foundational Genomic Resources On Wild Relatives Of Ricementioning

confidence: 99%

Current status of genomic resources on wild relatives of rice

et al. 2020

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Rice is a food crop of global importance, cultivated in diverse agro-climatic zones of the world. However, in the process of domestication many beneficial alleles have been eroded from the gene pool of the rice cultivated globally and eventually has made it vulnerable to a plethora of stresses. In contrast, the wild relatives of rice, despite being agronomically inferior, have inherited a potential of surviving in a range of geographical habitats. These adaptations enrich them with novel traits that upon introgression to modern cultivated varieties offer tremendous potential of increasing yield and adaptability. But, due to the unavailability of their genetic as well as genomic resources, identification and characterisation of these novel beneficial alleles has been a challenging task. Nevertheless, with the unprecedented surge in the area of conservation genomics, researchers have now shifted their focus towards these natural repositories of beneficial traits. Presently, there are several generic and specialized databases harboring genome-wide information on wild species of rice, and are acting as a useful resource for identification of novel genes and alleles, designing of molecular markers, comparative analysis and evolutionary biology studies. In this review, we introduce the key features of these databases focusing on their utility in rice breeding programs.

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“…A single dominant gene Xa4 confers resistance to Philippine isolate PX061 of bacterial blight (PETPISIT et al ., 1977), Resistance to grassy stunt is governed by a single major gene Gs (KHUSH & LING, 1974) ; resistance to brown planthopper is regulated by a single major gene Bph I (ATHWAL et al ., 1971) .…”

Section: Introductionmentioning

confidence: 99%