scholarly journals Colchicine and osmotic stress for improving anther culture efficiency on long grain temperate and tropical japonica rice genotypes

2019 ◽  
Vol 36 (4) ◽  
pp. 269-273
Author(s):  
Irene Ferreres ◽  
Mirari Ortega ◽  
Camilo López-Cristoffanini ◽  
Salvador Nogués ◽  
Xavier Serrat
Keyword(s):  
Osmotic Stress ◽  
Anther Culture ◽  
Japonica Rice ◽  
Tropical Japonica ◽  
Rice Genotypes

scholarly journals Genetic Diversity Analysis of 53 Indonesian Rice Genotypes using 6K Single Nucleotide Polymorphism Markers

2018 ◽  
Vol 14 (1) ◽  
pp. 1
Author(s):  
Joko Prasetiyono ◽  
Nurul Hidayatun ◽  
Tasliah Tasliah
Keyword(s):  
Genetic Diversity ◽  
Morphological Characters ◽  
Snp Markers ◽  
Japonica Rice ◽  
Rice Varieties ◽  
Tropical Japonica ◽  
Rice Chromosomes ◽  
Improvement Programs ◽  
Rice Genotypes ◽  
Genotypic Mixtures

<p>Indonesia is rich in rice genetic resources, however, only a small number has been used in variety improvement programs. This study aimed to determine the genetic diversity of Indonesian rice varieties using 6K SNP markers. The study was conducted at ICABIOGRAD for DNA isolation and IRRI for SNP marker analysis. Genetic materials were 53 rice genotypes consisting of 49 varieties and 4 check genotypes. SNP markers used were 6K loci. Results showed that among the markers analyzed, only 4,606 SNPs (76.77%) were successfully read. The SNP markers covered all twelve rice chromosomes of 945,178.27 bp. The most common allele observed was GG, whereas the least allele was TG. Dendrograms of the 53 rice varieties analyzed with 4,606 SNPs demonstrated several small groups containing genotypic mixtures between indica and japonica rice, and no groups were found to contain firmly indica or japonica type. Structure analysis (K = 2) with value of 0.8 showed that the 53 rice varieties were divided into several groups and each group consisted of 4 japonica, 2 tropical japonica, 46 indica, and 1 aus rice type, respectively. IR64 and Ciherang proved to have an indica genome, while Rojolele has japonica one. Dupa and Hawara Bunar, usually grouped into tropical japonica rice, were classified as indica type, and Hawara Bunar has perfectly 100% indica type. The results of this study indicated that rice classification (indica-japonica) which is usually classified based only on morphological characters, e.g. grain and leaf shapes, is not enough and classification based on SNP markers should be considered for that purpose.</p>

scholarly journals A Mediterranean japonica rice (Oryza sativa) cultivar improvement through anther culture

Euphytica ◽  
2013 ◽  
Vol 195 (1) ◽  
pp. 31-44 ◽  
Author(s):  
X. Serrat ◽  
M. Cardona ◽  
J. Gil ◽  
A. M. Brito ◽  
L. Moysset ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Anther Culture ◽  
Japonica Rice ◽  
Cultivar Improvement

Assessment of Seedling Growth of Deepwater Rice Genotypes under Osmotic Stress Condition

2016 ◽  
Vol 04 (04) ◽  
Author(s):  
Emam Ahmed MM ◽  
Haque MM ◽  
Arif Hasan Khan Robin ABM ◽  
Hossain MA ◽  
Biswash MR
Keyword(s):  
Osmotic Stress ◽  
Seedling Growth ◽  
Stress Condition ◽  
Deepwater Rice ◽  
Rice Genotypes

scholarly journals Efficient Anther Culture Method of the Japonica Rice Cultivar Koshihikari.

2000 ◽  
Vol 50 (3) ◽  
pp. 197-202 ◽  
Author(s):  
Masaaki Daigen ◽  
Osamu Kawakami ◽  
Yuji Nagasawa
Keyword(s):  
Anther Culture ◽  
Culture Method ◽  
Rice Cultivar ◽  
Japonica Rice

Root Development and Anti-Oxidative Response of Rice Genotypes under Polyethylene Glycol Induced Osmotic Stress

2020 ◽  
Vol 8 (2) ◽  
pp. 151-162 ◽  
Author(s):  
Juthy Abedin Nupur ◽  
Afsana Hannan ◽  
Abir Ul Islam ◽  
G H M Sagor ◽  
Arif Hasan Khan Robin
Keyword(s):  
Polyethylene Glycol ◽  
Osmotic Stress ◽  
Root Development ◽  
Oxidative Response ◽  
Rice Genotypes

Genetic Mapping of Sheath Blight Resistance QTLs within Tropical Japonica Rice Cultivars

Crop Science ◽  
2009 ◽  
Vol 49 (1) ◽  
pp. 256-264 ◽  
Author(s):  
Arun Sharma ◽  
Anna M. McClung ◽  
Shannon R. M. Pinson ◽  
Joseph L. Kepiro ◽  
A. Robert Shank ◽  
...  
Keyword(s):  
Genetic Mapping ◽  
Sheath Blight ◽  
Blight Resistance ◽  
Japonica Rice ◽  
Rice Cultivars ◽  
Resistance Qtls ◽  
Tropical Japonica ◽  
Sheath Blight Resistance

Use of 13C Isotope Discrimination Analysis to Quantify Distribution of Barnyardgrass and Rice Roots in a Four-Year Study of Weed-Suppressive Rice

Weed Science ◽  
2012 ◽  
Vol 60 (1) ◽  
pp. 133-142 ◽  
Author(s):  
David R. Gealy ◽  
Karen A. K. Moldenhauer
Keyword(s):  
Yield Loss ◽  
Rice Yield ◽  
Weed Suppression ◽  
Rice Root ◽  
Japonica Rice ◽  
Root Mass ◽  
Rice Cultivars ◽  
Tropical Japonica ◽  
Rice Roots ◽  
13C Isotope

In a 4-yr field study, “weed suppressive” rice cultivars provided 30% greater control of barnyardgrass and sustained 44% less yield loss (relative to weed-free) compared to “nonsuppressive” tropical japonica rice cultivars. 13C analysis revealed that rice root mass predominated vertically and laterally within the soil profile of plots infested with barnyardgrass. Among all cultivars, rice roots accounted for 75 to 90% of the total root mass in samples, and this was most concentrated in the surface 5 cm of soil in the row. Barnyardgrass roots were most prevalent in the surface 5 cm between rows where they accounted for 30% of total root mass. Overall, barnyardgrass root mass was about twice as high in nonsuppressive rice compared to suppressive rice. Weed suppression by indica/tropical japonica rice crosses generally was intermediate between that of the other two rice groups. At the 0- to 5-cm depth, between-rows, barnyardgrass root mass was correlated negatively with rice height (r = −0.424), yield (r = −0.306), and weed control ratings (r = −0.524) in weedy plots. Control ratings in weedy plots also were negatively correlated with rice percent height reduction (r = −0.415) and % yield loss (r = −0.747) relative to weed-free plots, and with barnyardgrass root mass as a percent of total root mass (r = −0.612). Control ratings were positively correlated with rice yield under weed pressure (r = 0.429) but were correlated with rice root mass in-rows only (r = −0.322). Clearly, rice root mass could not have been the major cause of the differences in barnyardgrass control between cultivars.

scholarly journals Proline, Total Antioxidant Capacity, and OsP5CS Gene Activity in Radical and Plumule of Rice are Efficient Drought Tolerance Indicator Traits

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Muhammad Abu Bakar Saddique ◽  
Zulfiqar Ali ◽  
Muhammad Ali Sher ◽  
Babar Farid ◽  
Rao Muhammad Ikram ◽  
...  
Keyword(s):  
Osmotic Stress ◽  
Antioxidant Capacity ◽  
Total Antioxidant Capacity ◽  
Dry Weight ◽  
Rapid Screening ◽  
Drought Tolerant ◽  
Plant Breeding Program ◽  
Total Antioxidant ◽  
Rice Genotypes ◽  
Crop Germplasm

The success of a plant breeding program is linked with the rapid screening of crop germplasm. In the following study, the germination stage of rice seeds has been examined for the rapid screening of drought-tolerant genotypes. The rice genotypes (10 drought tolerant, 5 moderately drought tolerant, and 5 drought susceptible) were sown in Petri dishes under control and osmotic stress of 15% PEG6000. Data were recorded after four days of sowing for the osmotic stress-induced change in imbibition rate, speed of germination, radical and plumule length, radical and plumule total fresh and dry weight, proline contents, total antioxidant capacity, and malondialdehyde level in radical and plumule of seeds. Moreover, the change in expression of OsP5CS gene was also recorded in one of each drought tolerant, moderately drought tolerant, and drought susceptible genotypes. Under osmotic stress, the level of proline, total antioxidant capacity, and the expression of OsP5CS were increased in drought-tolerant genotypes as compared to moderately drought tolerant and drought susceptible genotypes. While, the change in imbibition rate, speed of germination, radical and plumule length, and fresh and dry weight were not symmetrical in drought tolerant, moderately drought tolerant, and drought susceptible genotypes. In short, the symmetrical change in proline, total antioxidant capacity, and expression of OsP5CS gene within radical and plumule of drought tolerant, moderately drought tolerant, and drought susceptible genotypes can help rapid screening of drought-tolerant rice genotypes.

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