scholarly journals Enhancement of Rice Leaf Photosynthesis by Crossing between Cultivated Rice,Oryza sativaand Wild Rice Species,Oryza rufipogon

2004 ◽  
Vol 7 (3) ◽  
pp. 252-259 ◽  
Author(s):  
Chisato Masumoto ◽  
Takashige Ishii ◽  
Sono Kataoka ◽  
Tomoko Hatanaka ◽  
Naotsugu Uchida
Keyword(s):  
Wild Rice ◽  
Oryza Rufipogon ◽  
Leaf Photosynthesis ◽  
Cultivated Rice ◽  
Rice Leaf ◽  
Wild Rice Species

scholarly journals Rubisco activity, electron transport rate, and leaf features drive high photosynthesis rate in the selected wild rice

2019 ◽  
Author(s):  
Jyotirmaya Mathan ◽  
Anuradha Singh ◽  
Vikram Jathar ◽  
Aashish Ranjan
Keyword(s):  
Electron Transport ◽  
Wild Rice ◽  
Electron Transport Rate ◽  
Transport Rate ◽  
Leaf Photosynthesis ◽  
Cultivated Rice ◽  
Rubisco Activity ◽  
Rice Varieties ◽  
Mesophyll Cells ◽  
Wild Rice Species

AbstractThe importance of increasing photosynthetic efficiency for sustainable crop yield increases to feed the growing world population is well recognized. The natural genetic variation for leaf photosynthesis in crop plants is largely unexploited for increasing genetic yield potential. The genus Oryza, including cultivated rice and wild relatives, offers tremendous genetic variability to explore photosynthetic differences, and underlying biochemical, photochemical, and developmental basis. We quantified leaf photosynthesis and related physiological parameters for six cultivated and three wild rice genotypes, and identified photosynthetically efficient wild rice species. Fitting A/Ci curves followed by experimental validation showed that the leaf photosynthesis in cultivated rice varieties, IR64 and Nipponbare, was limited due to Rubisco activity and electron transport rate, compared to photosynthetically efficient wild rice species, Oryza australiensis and Oryza latifolia. The selected wild rice species with high leaf photosynthesis per unit area had striking anatomical features, such as larger mesophyll cells with more chloroplasts, larger and closer veins, and fewer mesophyll cells between two consecutive veins. Our results show the existence of desirable variations in Rubisco activity, electron transport rate, and mesophyll and vein features in the rice system itself that could possibly be targeted for increasing the photosynthetic efficiency of cultivated rice varieties.HighlightDistinct leaf biochemical, photochemical, and developmental features contribute to efficient photosynthesis in the selected wild rice that could potentially be exploited for increasing rice leaf photosynthesis.

Phosphate Solubilizing Rhizospherebacterial T21 Isolated from Dongxiang Wild Rice Species Promotes Cultivated Rice Growth

2011 ◽  
Vol 108 ◽  
pp. 167-175 ◽  
Author(s):  
Qing Gui Zeng ◽  
Fei Luo ◽  
Zhi Bin Zhang ◽  
Ri Ming Yan ◽  
Du Zhu
Keyword(s):  
Plant Growth ◽  
Wild Rice ◽  
Pantoea Agglomerans ◽  
Oryza Rufipogon ◽  
Plant Growth Promoting Bacteria ◽  
Cultivated Rice ◽  
Wild Rice Species ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Dongxiang Wild Rice

The capability of bacterial strain T21 isolated from Dongxiang wild rice (Oryza rufipogon) rhizosphere to behave as plant growth promoting bacteria (PGPB) was investigated. Rhizosphere bacteria T21 showed P-solubilizing capability when cultured in the PVK medium amended with tricalcium phosphate. The strain T21 also showed nitrogen-fixing activity in N-free medium, and produced indole-3-acetic (IAA) and siderophore. The strain T21 was identified as Pantoea agglomerans by morphology, physiological and biochemical properties, and 16S rDNA sequence analysis. The strain T21 was formulated as an inoculant in order to evaluate its growth promotion effect in the field when applied on the cultivated rice at the sowing time. It showed a significant plant growth-promoting effect on seedling length, root length, fresh weight and dry weight of the cultivated rice (Oryza sativa). These findings fetched us to conclude that wild rice rhizospheric microorganism Pantoea agglomerans T21 could stimulate the growth of cultivated rice in vivo in poor soil.

scholarly journals Identification of long noncoding natural antisense transcripts (lncNATs) correlated with drought stress response in wild rice (Oryza nivara)

2021 ◽  
Author(s):  
Yong-Chao Xu ◽  
Jie Zhang ◽  
Dong-Yan Zhang ◽  
Ying-Hui Nan ◽  
Song Ge ◽  
...  
Keyword(s):  
Drought Stress ◽  
Stress Response ◽  
Wild Rice ◽  
Oryza Rufipogon ◽  
Cultivated Rice ◽  
Antisense Transcripts ◽  
High Genetic Diversity ◽  
Natural Antisense Transcripts ◽  
Form Complex ◽  
Oryza Nivara

Abstract Background Wild rice, including Oryza nivara and Oryza rufipogon, which are considered as the ancestors of Asian cultivated rice (Oryza sativa L.), possess high genetic diversity and serve as a crucial resource for breeding novel cultivars of cultivated rice. Although many rice domestication related traits, such as seed shattering and plant architecture, have been intensively studied at the phenotypic and genomic levels, further investigation is needed to understand the molecular basis of phenotypic differences between cultivated and wild rice. Drought stress is one of the most severe abiotic stresses affecting rice growth and production. Adaptation to drought stress involves a cascade of genes and regulatory factors that form complex networks. Long noncoding natural antisense transcripts (lncNATs), a class of long noncoding RNAs (lncRNAs), regulate the corresponding sense transcripts and play an important role in plant growth and development. However, the contribution of lncNATs to drought stress response in wild rice remains largely unknown. Results Here, we conducted strand-specific RNA sequencing (ssRNA-seq) analysis of Nipponbare (O. sativa ssp. japonica) and two O. nivara accessions (BJ89 and BJ278) to determine the role of lncNATs in drought stress response in wild rice. A total of 1,246 lncRNAs were identified, including 1,091 coding–noncoding NAT pairs, of which 50 were expressed only in Nipponbare, and 77 were expressed only in BJ89 and/or BJ278. Of the 1,091 coding–noncoding NAT pairs, 240 were differentially expressed between control and drought stress conditions. Among these 240 NAT pairs, 12 were detected only in Nipponbare, and 187 were detected uniquely in O. nivara. Furthermore, 10 of the 240 coding–noncoding NAT pairs were correlated with genes previously demonstrated to be involved in stress response; among these, nine pairs were uniquely found in O. nivara, and one pair was shared between O. nivara and Nipponbare. Conclusion We identified lncNATs associated with drought stress response in cultivated rice and O. nivara. These results will improve our understanding of the function of lncNATs in drought tolerance and accelerate rice breeding.

Whole grain morphology of Australian rice species

2009 ◽  
Vol 8 (1) ◽  
pp. 74-81 ◽  
Author(s):  
S. Kasem ◽  
D. L. E. Waters ◽  
N. Rice ◽  
F. M. Shapter ◽  
R. J. Henry
Keyword(s):  
Wild Rice ◽  
Grain Morphology ◽  
Whole Grain ◽  
Cultivated Rice ◽  
Rice Varieties ◽  
Wild Rice Species ◽  
Breeding Programmes ◽  
Standard Classification ◽  
Novel Alleles ◽  
Grain Colour

The grain morphology of 17 wild rice relatives were studied by light and scanning electron microscopy and compared to two cultivated rice varieties (Oryza sativa cv. Nipponbare and O. sativa cv. Teqing). Observations were made of the grain colour, size and shape. Grains from wild rice species exhibited a variety of colours that have potential aesthetic and nutritional value. The grains of these species exhibited a wide array of sizes and shapes, but still fell within the standard classification scale that rice breeders use for routine breeding evaluation. These results highlight the potential of these species as whole grain foods or as sources of novel alleles in conventional rice breeding programmes.

Extraordinarily polymorphic ribosomal DNA in wild and cultivated rice

Genome ◽  
1996 ◽  
Vol 39 (6) ◽  
pp. 1109-1116 ◽  
Author(s):  
K. D. Liu ◽  
Qifa Zhang ◽  
G. P. Yang ◽  
M. A. Saghai Maroof ◽  
S. H. Zhu ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Ribosomal Dna ◽  
Wild Rice ◽  
Indica Rice ◽  
Intergenic Spacer ◽  
Oryza Rufipogon ◽  
Japonica Rice ◽  
Cultivated Rice ◽  
Spacer Length ◽  
Origin And Evolution

A collection of 481 rice accessions was surveyed for ribosomal DNA (rDNA) intergenic spacer length polymorphism to assess the extent of genetic diversity in Chinese and Asian rice germplasm. The materials included 83 accessions of common wild rice, Oryza rufipogon, 75 of which were from China; 348 entries of cultivated rice (Oryza sativa), representing almost all the rice growing areas in China; and 50 cultivars from South and East Asia. A total of 42 spacer length variants (SLVs) were detected. The size differences between adjacent SLVs in the series were very heterogeneous, ranging from ca. 21 to 311 bp. The 42 SLVs formed 80 different rDNA phenotypic combinations. Wild rice displayed a much greater number of rDNA SLVs than cultivated rice, while cultivated rice showed a larger number of rDNA phenotypes. Indica and japonica groups of O. sativa contained about equal numbers of SLVs, but the SLV distribution was significantly differentiated: indica rice was preferentially associated with longer SLVs and japonica rice with shorter ones. The results may have significant implications regarding the origin and evolution of cultivated rice, as well as the inheritance and molecular evolution of rDNA intergenic spacers in rice. Key words : rDNA, Oryza rufipogon, Oryza sativa, germplasm diversity, evolution.

Genome-wide genic SSR marker development for the endangered Dongxiang wild rice (Oryza rufipogon)

2016 ◽  
Vol 15 (6) ◽  
pp. 566-569
Author(s):  
Jiankun Xie ◽  
Meng Zhang ◽  
Jia Sun ◽  
Fantao Zhang
Keyword(s):  
Ssr Markers ◽  
Wild Rice ◽  
Pcr Amplification ◽  
Oryza Rufipogon ◽  
Sequencing Technology ◽  
Cultivated Rice ◽  
Genic Ssr ◽  
Genome Wide ◽  
Dongxiang Wild Rice ◽  
Simple Sequence

AbstractDongxiang wild rice (Oryza rufipogon, DXWR), one of the species of common wild rice, is regarded as an important genetic resource for the improvement of cultivated rice (Oryza sativa). Molecular markers are reliable tools that can greatly accelerate the breeding process and have been widely used in various species. In the present study, a total of 3681 genic simple sequence repeat (SSR) markers were developed for DXWR based on transcriptome sequencing technology. Additionally, 25 primer pairs were randomly selected and synthesized for the verification. Among them, 18 (72%) primer pairs were successfully amplified in PCR amplification with genomic DNA of DXWR and also had abundant polymorphisms between DXWR and cultivated rice. These novel genic SSR markers will enrich current genomic resources for DXWR, and provide an effective tool for genetic study and molecular marker assisted breeding for this valuable and endangered germplasm.

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