Whole grain morphology of Australian rice species

Kasem, Shabana; Waters, Daniel Le; Rice, Nicole F; Shapter, Frances M; Henry, Robert J.

doi:10.1017/s1479262109990189

Cited by 14 publications

(29 citation statements)

References 24 publications

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“…The grain characteristics of Australian Oryza have been investigated to establish their potential as domesticated food crops and to evaluate the likely impact that they might have on rice grain quality if used as genetic resources for rice (O. sativa) breeding. The whole grain appearances of O rufipogon, O. meridionalis, and O. australiensis suggest these species have potential as whole grain foods that could be consumed as alternatives to O. sativa (Kasem et al 2010). The grains are generally of a similar size but have a darker appearance when compared with cultivated rice.…”

Section: Utilization Of Australian Oryzamentioning

confidence: 99%

Australian Oryza: Utility and Conservation

Henry

Rice

Waters

et al. 2009

Rice

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Australian Oryza are an understudied and underexploited genetic resource for rice improvement. Four species are indigenous: Oryza rufipogon, Oryza meridionalis, Oryza australiensis are widespread across northern Australia, whereas Oryza officinalis is known from two localities only. Molecular analysis of these wild populations is required to better define the distinctness of the taxa and the extent of any gene flow between them and rice. Limited collections of these wild populations are held in seed and DNA banks. These species have potential for domestication in some cases but also have many traits of potential value in the improvement of domesticated rice. Stress tolerance (biotic and abiotic) and grain quality characteristics in these populations may be useful.

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Section: Utilization Of Australian Oryzamentioning

confidence: 99%

Australian Oryza: Utility and Conservation

Henry

Rice

Waters

et al. 2009

Rice

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“…Whole grains of Australian wild rice varieties may be consumed (Kasem et al 2010 and Ion Torrent (Life Technology) sequencing platforms were used to sequence total DNA from rice to identify polymorphisms in the whole chloroplast genome sequence of a wild rice plant relative to cultivated rice (var. Nipponbare).…”

Section: )mentioning

confidence: 99%

Genomic characterisation of Australian wild rice species

Brożyńska¹

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Rice (Oryza sativa L.) is one of the most important crops in the world and a basic food source for about two-thirds of the population. It has been grown in the tropics and sub-tropics probably for thousands of years. Owing to the fast growing world population, there is a high demand for increased and improved rice production. Wild relatives of cultivated rice, the related A genome species, carry a vast genetic diversity and are a significant resource for rice improvement. including the cultivars, using full chloroplast sequence as well as nuclear genome regions; secondly, creating genomic resources of these wild rice relatives by means of whole genome sequencing and generating reference genomes for the two novel Australian wild rice taxa. The draft genomes generated were used for whole genome characterization studies including phylogenetic reconstruction with high resolution, divergence time estimation, structural descriptions, gene annotation, and repeat content exploration. The evolutionary inference results revealed that northern

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“…The distribution of O. officinalis requires more investigation as it has been found in two remote area and poorly collected regions only (Henry et al, 2009) whereas the other three species are widespread resource in floodplains across monsoonal Australian (northern Australian).…”

Section: Potentials Of Australian Wild Rice For Rice Breedingmentioning

confidence: 99%

“…Oryza rufipogon was medium in length and had slender grains (Kasem et al, 2009 (Kasem et al, 2009). However, those wild rice samples grown in a control environment in a glass house may have different grain quality compared to that grown in nature.…”

Section: Potential Of Australian Wild Rice For Rice Processingmentioning

confidence: 99%

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Grain quality of Australian wild rice (compared to domesticated rice)

Tikapunya¹

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Wild rice may be an important resource for rice food security. Studies of the grain quality of wild rices may facilitate their use in rice breeding. Australian wild rice populations have been shown to be genetically distinct from those found elsewhere indicating that they may be a potential source of valuable alleles for rice improvement. To date, two taxa belonging to the A genome clade have been described in Australia: wild rice taxa A (Oryza rufipogon like) and wild rice taxa B (Oryza meridionalis like). To explore the grain quality of these wild rices from their natural environment, a collection from eleven sites within 300 kms north of Cairns, Queensland, Australia at the beginning of the dry season in May 2014 and 2015 was evaluated.Analysis of the physical traits of three Australian wild rice taxa revealed that the wild A genome taxa were of a size that could be classified as extra-long paddy rice with grains that were long or medium while Oryza australiensis was categorized as a long paddy rice with short grain. Australian wild rice grains were coloured and varied from light red brown to dark brown while domesticated rice is brighter. Due to the difficulty of obtaining sufficient mature wild rice seeds as well as the colour of the wild rice, further analysis of grain quality was conducted on unpolished wild rice. Starch molecular structures of Australian wild rice were very different from those of domesticated rice. They had a high amylose content with a larger proportion of shorter amylose chains and a lower proportion of amylopectin chains DP ≤ 10 to DP ≤ 24 lead to a higher gelatinization temperatures as well as requiring a longer cooking time. However, the starch molecular structures of Australian wild rice meet the criteria for slowly digestible starch indicating a potentially higher nutritional value.Cooking behaviours of the unpolished rice were related to the different bran layer characteristics and starch molecular structures.Cooked O. australiensis has the lowest hardness even though it had a higher amylose content and required a longer cooking time. Cooked wild rice taxa B also had a lower hardness compared to unpolished commercial rices, suggesting that the histological structures of the wild rice grain caryopsis may differ from that of domesticated rice.However, the amylose content still played an essential role contributing to stickiness of the cooked unpolished rice. Pasting properties of these unpolished rice flours suggested less retrograded starch in pastes of Australian wild rice especially in O. australiensis. Among the wild rice A genome taxa, wild rice taxa A had a lower pasting viscosity than wild rice taxa B early in gelatinization. However, the final viscosity of the former was slightly higher.ii Furthermore, the pasting behaviour of wild rice taxa B was more similar to that of Oryza sativa L.cv. Nipponbare (japonica rice). The eating characteristics of wild rice taxa B compared to commercial wild rice (Zizania aquatic L), Oryza sativa L.cv. Nipponbare, and seven unpolish...

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Whole grain morphology of Australian rice species

Cited by 14 publications

References 24 publications

Australian Oryza: Utility and Conservation

Australian Oryza: Utility and Conservation

Genomic characterisation of Australian wild rice species

Grain quality of Australian wild rice (compared to domesticated rice)

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