scholarly journals Studies on the yield abilities of the rice vareities in Japan. : Continued : On tne classification of rice varieties by the type of heading stage of the plant in prefectural distribution.

1948 ◽  
Vol 17 (1) ◽  
pp. 31-34
Author(s):  
Isamu Morimoto
Keyword(s):  
Rice Varieties ◽  
Heading Stage

scholarly journals INFLUENCE OF PERIODIC SHADING ON THE LENGTH AND SOLIDNESS OF THE INTERNODES OF RESCUE WHEAT

1960 ◽  
Vol 40 (1) ◽  
pp. 183-187 ◽  
Author(s):  
N. D. Holmes ◽  
R. I. Larson ◽  
L. K. Peterson ◽  
M. D. MacDonald
Keyword(s):  
Light Intensity ◽  
Cross Sections ◽  
Strongly Correlated ◽  
Boot Stage ◽  
Stem Solidness ◽  
Heading Stage

Shading at the initiation of elongation shortened the internodes of Rescue wheat whereas shading later in the elongation period caused the internodes to elongate as much as or more than if they had not been shaded.The solidness of the bottom Internode, 1, was reduced mainly by shading from the 2-leaf to the boot stage, while that of Internodes 2 and 3 was reduced mainly by shading from the 4-leaf to the boot stage. The solidness of Internode 4 was reduced mainly by shading from the boot to the heading stage. The solidness in the lower 3 internodes was affected by reduction in light intensity even after the boot stage. Severe lodging occurred only in stems shaded from the boot to the heading stage.Two methods were used for rating stem solidness, namely, measurement in the split stem of proportion of the internode filled with pith, and classification of solidness of cross-sections at designated points in each internode. They were strongly correlated and appeared to give equally accurate estimates of solidness, although their degrees of sensitivity varied with the amount of stem solidness present.

scholarly journals Feature Based Qualitative Classification of Rice Varieties: A Review

2020 ◽  
Vol 64 (02) ◽  
pp. 305-312
Author(s):  
Komal ◽  
Ganesh Kumar Sethi ◽  
Rajesh Kumar Bawa
Keyword(s):  
Rice Varieties ◽  
Qualitative Classification ◽  
Feature Based

scholarly journals Foliar application of sodium selenate induces regulation in yield formation, grain quality characters and 2-acetyl-1-pyrroline biosynthesis in fragrant rice

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Haowen Luo ◽  
Bin Du ◽  
Longxin He ◽  
Axiang Zheng ◽  
Shenggang Pan ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Grain Yield ◽  
Grain Quality ◽  
Foliar Application ◽  
Higher Plants ◽  
Sodium Selenate ◽  
Rice Varieties ◽  
Fragrant Rice ◽  
The Stability ◽  
Heading Stage

Abstract Background Selenium (Se) is a beneficial element for higher plants and essential for mammals. To study the effect of the foliar application of sodium selenate on fragrant rice performance, a pot experiment was conducted in Guangdong, China. At the initial heading stage, one-time foliar application of sodium selenate with concentrations of 0, 10, 20, 30, 40 and 50 μmol·L− 1 (named CK, Se1, Se2, Se3, Se4 and Se5, respectively) were foliar applied on two fragrant rice varieties, ‘Meixiangzhan-2’ and ‘Xiangyaxiangzhan’. Results Selenate application at the initial heading stage not only improved the grain yield of fragrant rice by increasing the seed-setting rate and grain weight, but also promoted the grain quality by increasing crude protein contents and lowering the chalky rice rate. Furthermore, Se applications enhanced the biosynthesis of 2-acetyl-1- pyrroline (2-AP), the main aromatic compound, by increasing the contents of precursors (△1- pyrroline, proline and pyrroline-5-carboxylic acid (P5C)) and the activities of enzymes (proline dehydrogenase (PRODH), △1-pyrroline-5-carboxylic acid synthetase (P5CS), and ornithine aminotransferase (OAT)) in fragrant rice. The results also showed that foliar application of sodium selenate enhanced the antioxidant system of both varieties by promoting the activities of peroxidase (POD), superoxide dismutase (SOD), catalase (CAT) and reducing the contents of malondialdehyde (MDA). Furthermore, the real-time PCR analyses depicted that foliar application of selenate up-regulated the GPX1, GPX4 and CATC transcripts. The higher antioxidative enzymatic activities might strength the stress resistant to ensure the stability of yield in fragrant rice form abiotic stress. Conclusions Foliar applications of sodium selenate at the initial heading stage increased the grain 2-AP content by enhancing the biosynthesis-related enzymes and precursors. The grain yield and quality of fragrant rice also increased due to selenate application. Furthermore, foliar application of selenate promoted the activities of enzymes such as POD, SOD and CAT and up-regulated the expression of gene GPX4, GPX1 and CATC.

scholarly journals Determination of minimum number of random SNP for accurate population classification in rice (Oryza sativa L.)

2020 ◽  
Author(s):  
Shan Wang ◽  
Junhua Ye ◽  
Qun Xu ◽  
Xin Xu ◽  
Yingying Yang ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Structure Analysis ◽  
Sampling Method ◽  
Cross Validation ◽  
Rice Varieties ◽  
Germplasm Collections ◽  
Population Structure Analysis ◽  
Cross Validation Error ◽  
Minimum Number

Abstract Background: Classification of germplasm collections is of great importance for both the conservation and utilization of genetic resources. Thus, it is necessary to estimate and classify rice varieties in order to utilize these germplasms more efficiently for rice breeding. However, molecular classification of large germplasm collections can be costly and labor-intensive. Development of an informative panel of a few markers would allow for rapid and cost-effective assignment of crops to genetic sub-populations.Results: Here, the minimum number of random SNP for rice classification (MNRSRC) was studied using a panel of 51 rice varieties belonging to different sub-groups. Through the genetic structure analysis, the rice panel can be obviously divided into five subgroups. The estimation of the MNRSRC was performed using SNP random sampling method based on genetic diversity and population structure analysis. In the genetic diversity analysis, statistical analysis of the coefficient of variation (CV) was performed for MNRSRC estimation, and we found that CV variation tended to plateau when the number of SNP was around 200, which was verified by the both cross-validation error of K value and correlation analysis of genetic distance. When the number of SNPs was greater than 200, the distribution of cross-validation error value tended to be similar, and correlation coefficients, almost greater than 0.95, exhibited small range of variation. In addition, we found that MNRSRC might not be affected by the number of varieties and the type of varieties.Conclusion: The estimation of the MNRSRC was performed using SNP random sampling method based on genetic diversity and population structure analysis. The results demonstrated that at least about 200 random filtered SNP loci were required for classification in a rice panel. In addition, we also found that MNRSRC might not be affected by the number of varieties and the type of varieties. The study on MNRSRC in this study can provide a reference and theoretical basis for classification of different types of rice panels.

scholarly journals Lodging Resistance as Related to Root Traits for Mechanized Wet Seeding of Two Super Rice Cultivars

2019 ◽  
Author(s):  
Minghua Zhang ◽  
Zhaowen Mo ◽  
Juan Liao ◽  
Shenggang Pan ◽  
Xiongfei Chen ◽  
...  
Keyword(s):  
Grain Yield ◽  
Field Experiments ◽  
Root Traits ◽  
Dry Weight ◽  
Maturity Stage ◽  
Lodging Resistance ◽  
Rice Varieties ◽  
Significant Difference ◽  
Superficial Area ◽  
Heading Stage

The mechanical hill wet-seeded rice machine is benefits to establish uniform seedling, and ditches were established by using this machine. However, little knowledge is known on the effect of the establishment of ditches on growth, lodging and yield, and their relationship with root traits. In this study, two field experiments were conducted during 2012 and 2013 with using two super rice varieties (i.e. hybrid rice ‘Peizataifeng’ and inbred rice ‘Yuxiangyouzhan’) grown under three ditches establishment treatments (i.e. T1: both water ditches and seed ditches were established by the machine, T2: seed ditches were established by the machine, T3: neither water nor seed ditches were established by the machine). The lodging index and lodging resistance traits, the grain yield and above-ground dry weight and the root traits were measured. The results showed that the lodging index was significantly affected by the treatments with ditches. The strongest lodging resistance was detected in mechanical hill wet-seeded rice with ditches treatment in both 2012 and 2013. The lodging resistance was strongly related to the breaking resistance, the root volume and root superficial area at the heading stage and maturity stage and the total root length at the heading stage. No significant difference was investigated in grain yield or dry weight of mechanical hill wet-seeded rice. Yuxiangyouzhan showed higher grain yield, dry weight and better lodging resistance but unfavorable root growth attributes than Peizataifeng. Therefore, the mechanical hill wet-seeded rice with ditches treatment increased rice lodging resistance is related to root traits.

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