Correction to: Isolation of the sperm and egg cells in wild rice (Oryza officinalis) as a mechanism for crop improvement

Rice is the staple food crop in Sri Lanka, which occupies 34% (0.77/million ha) of the total cultivated area. Sri Lanka currently produces 2.7 million tonnes of rough rice annually and satisfies around 95% of the domestic requirement. In Sri Lanka, genus Oryza consists of two species complexes, O. sativa (AA) and O. officinalis (CC). These two complexes are both pan tropical and have very similar overall distribution. Five wild rice species are reported in Sri Lanka, (O. nivara [AA], O. rufipogan (AA) O. eichengeri [CC], O. rhizomatis (CC) and O. granulate (GG). O. rhizomatis has been reported only in Sri Lanka and considered endemic to Sri Lanka. Recent studies demonstrated, the reliance on single source of information could mislead results in the phylogenetic inferences due to analytical inconsistency and biological processes. Therefore, exact number of wild rice species in Sri Lanka becomes uncertain and the necessity arises to assess Oryza species complexes in Sri Lanka using morphological, anatomical, and molecular information to enumerate number of species within each Oryza complex and characterization of species and species complexes. The study revealed, characterization of wild rice species, to a certain extent, can be made through morphological and anatomical characters, specially lamina anatomical characters. Molecular information is more reliable in delimitation of wild rice species complexes in Sri Lanka. O. rhizomatis and O. eichingeri (CC) are well separated from the rest of wild rice species (AA). Molecular data revealed, O. nivara and O. rufipogon have undergone independent evolution within Sri Lanka. Well separated five wild rice species are existing in Sri Lanka. Studies on ecological resilience of morphological, anatomical, and molecular studies are very useful for species enumeration of wild rice complexes in Sri Lanka. The findings led to conclude that wild rice species in Sri Lanka are “ecological swarms” and represents allopatric or sympatric populations. A comprehensive knowledge on genetic diversity and population structure of wild rice germplasm in Sri Lanka provides useful information to include these locally adapted and evolved wild rice species in rice crop improvement/breeding.

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Isolation and Identification of (-)-Jasmonic Acid from Wild Rice, Oryza officinalis, as an Antifungal Substance.

Agricultural and Biological Chemistry ◽

10.1271/bbb1961.55.3097 ◽

1991 ◽

Vol 55 (12) ◽

pp. 3097-3098 ◽

Cited By ~ 9

Author(s):

Germane Cord NETO ◽

Yoshiki KONO ◽

Hiroshi HYAKUTAKE ◽

Manabu WATANABE ◽

Yoshikatsu SUZUKI ◽

...

Keyword(s):

Jasmonic Acid ◽

Wild Rice ◽

Isolation And Identification ◽

Antifungal Substance ◽

Oryza Officinalis

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Genetic-basis analysis of heterotic loci in Dongxiang common wild rice (Oryza rufipogon Griff.)

Genetics Research ◽

10.1017/s0016672312000250 ◽

2012 ◽

Vol 94 (2) ◽

pp. 57-61 ◽

Cited By ~ 4

Author(s):

XIAO-JIN LUO ◽

XIAO-YUN XIN ◽

JIN-SHUI YANG

Keyword(s):

Wild Rice ◽

Genetic Basis ◽

Single Point ◽

Crop Improvement ◽

Dominant Gene ◽

Introgression Line ◽

Oryza Rufipogon ◽

Cultivated Rice ◽

Common Wild Rice ◽

Point Analysis

SummaryHeterosis is widely used in genetic crop improvement; however, the genetic basis of heterosis is incompletely understood. The use of whole-genome segregating populations poses a problem for establishing the genetic basis of heterosis, in that interactions often mask the effects of individual loci. However, introgression line (IL) populations permit the partitioning of heterosis into defined genomic regions, eliminating a major part of the genome-wide epistasis. In our previous study, based on mid-parental heterosis (HMP) value with single-point analysis, 42 heterotic loci (HLs) associated with six yield-related traits were detected in wild and cultivated rice using a set of 265 ILs of Dongxiang common wild rice (Oryza rufipogon Griff.). In this study, the genetic effects of HLs were determined as the combined effects of both additive and dominant gene actions, estimated from the performance values of testcross F1s and the dominance effects estimated from the HMP values of testcross F1s. We characterized the gene action type at each HL. Thirty-eight of the 42 HLs were over-dominant, and in the absence of epistasis, four HLs were dominant. Therefore, we favour that over-dominance is a major genetic basis of ‘wild-cultivar’ crosses at the single functional Mendelian locus level.

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GA-mediated spatial control of cell division expounds the leaf size variation between cultivated and wild rice

10.1101/2021.05.06.443003 ◽

2021 ◽

Author(s):

Vikram Jathar ◽

Kumud Saini ◽

Ashish Chauhan ◽

Ruchi Rani ◽

Yasunori Ichihashi ◽

...

Keyword(s):

Cell Cycle ◽

Cell Division ◽

Wild Rice ◽

Crop Improvement ◽

Leaf Size ◽

Leaf Length ◽

Size Regulation ◽

Rice Leaf ◽

Length Regulation ◽

Oryza Australiensis

Leaf size is a major determinant of crop performance by influencing leaf physiological processes, such as light capture, transpiration, and gas exchange. Therefore, understanding the genetic basis of leaf size regulation is imperative for crop improvement. Natural variation in leaf size for a crop plant is a valuable genetic resource for a detailed understanding of leaf size regulation. We investigated the mechanism controlling the rice leaf length using cultivated and wild rice accessions that showed remarkable differences for the leaf features. Comparative transcriptomic profiling of the contrasting accessions suggested the involvement of Gibberellic Acid (GA), Growth Regulating Factor (GRF) transcription factors, and cell cycle in the rice leaf size regulation. Leaf kinematics studies showed that the increased domain of cell division activity along with a faster cell production rate drove the longer leaves in the wild rice Oryza australiensis compared to the cultivated varieties. Higher GA levels in the leaves of Oryza australiensis, and GA-induced increase in the rice leaf length via an increase in cell division zone emphasized the key role of GA in rice leaf length regulation. Zone-specific expression and silencing of the GA biosynthesis and signaling genes confirmed that OsGRF7 and OsGRF8 function downstream to GA for controlling cell cycle to determine the rice leaf length. The GA-GRF-cell cycle module for rice leaf length regulation might have contributed to optimizing leaf features during the domestication and could also be a way for plants to achieve leaf plasticity in response to the environment.

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Comparative RFLP mapping of a wild rice, Oryza officinalis, and cultivated rice, O. sativa

Genome ◽

10.1139/g94-054 ◽

1994 ◽

Vol 37 (3) ◽

pp. 382-389 ◽

Cited By ~ 28

Author(s):

K. K. Jena ◽

G. S. Khush ◽

G. Kochert

Keyword(s):

Gene Order ◽

High Frequency ◽

Wild Rice ◽

Chromosome 1 ◽

Rflp Markers ◽

Chromosome 11 ◽

Cultivated Rice ◽

Oryza Officinalis ◽

Rflp Map ◽

Comparative Maps

A comparative RFLP map was constructed in a wild rice, Oryza officinalis, by using 139 genomic and cDNA probes that had been used previously to map RFLPs in O. sativa. Nine of the 12 chromosomes of O. officinalis were highly homosequential to those of O. sativa. A major rearrangement of gene order was detected in chromosome 1 and small inversions were found in chromosomes 3 and 11. Fourteen translocated RFLP markers were found, and chromosome 11 contained a high frequency of such translocated segments. Results were consistent with meiotic and trisomie analysis, which suggested that the genomes of O. officinalis and O. sativa were similar. Applications of comparative maps in plant breeding and gene cloning are discussed.Key words: Oryza, rice, wild rice, RFLP, genetic map.

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