The development, penetrance, and seed vigour of multi-ovary wheat and its application in hybrid breeding

2019 ◽  
Vol 70 (9) ◽  
pp. 781 ◽  
Author(s):  
Jialin Guo ◽  
Gaisheng Zhang ◽  
Yulong Song ◽  
Shoucai Ma ◽  
Na Niu ◽  
...  
Keyword(s):  
Floral Development ◽  
Theoretical Foundation ◽  
Developmental Process ◽  
Early Stage ◽  
Wheat Breeding ◽  
Hybrid Breeding ◽  
High Yield ◽  
Practical Application ◽  
Seed Vigour ◽  
Germination Ability

Multi-ovary wheat is a unique variety of wheat that has one to three pistils and three stamens, and can stably set one to three grains in each floret. By observing the developmental process of additional pistils, we found that the additional pistil was derived from a protrusion generated at the base of the main pistil, between the frontal stamen and lateral stamen. The additional pistil’s development was greatly delayed compared with the main pistil at an early stage. However, after the awn exposed stage, it developed very rapidly to a mature pistil within the maturity time of the main pistil. Generally, the grains originating from additional pistils were smaller than the grains from the main pistil. By studying the penetrance and germination conditions of multi-ovary wheat, we found that no matter which ovary the grains originated from, they had the same penetrance. However, the germination ability of grains generated from the main pistil was significantly higher than that of grains from additional pistils. Our results showed that multi-ovary wheat was an excellent variety, not only for studying the mechanisms of the multi-ovary trait and floral development in wheat, but also for improving the propagation coefficient and promoting the progress of wheat breeding. This paper lays a theoretical foundation for the practical application of multi-ovary trait in hybrid wheat; our results could be implemented in fostering future breeding activities focussed on the development of high yield wheat cultivars.

Hybrid breeding in wheat: how shaping floral biology can offer new perspectives

2020 ◽  
Vol 47 (8) ◽  
pp. 675 ◽  
Author(s):  
Caterina Selva ◽  
Matteo Riboni ◽  
Ute Baumann ◽  
Tobias Würschum ◽  
Ryan Whitford ◽  
...  
Keyword(s):  
Control Systems ◽  
Floral Development ◽  
Seed Set ◽  
Fertility Control ◽  
Triticum Aestivum L ◽  
Floral Biology ◽  
Wheat Breeding ◽  
Hybrid Breeding ◽  
Hybrid Wheat ◽  
Male And Female

Hybrid breeding in wheat (Triticum aestivum L.) has the potential to deliver major yield increases. This is a requisite to guarantee food security for increasing population demands and to counterbalance the effects of extreme environmental conditions. Successful hybrid breeding in wheat relies on forced outcrossing while preventing self-pollination. To achieve this, research has been directed towards identifying and improving fertility control systems. To maximise cross-pollination and seed set, however, fertility control systems need to be complemented by breeding phenotypically distinct male and female lines. This review summarises existing and novel male sterility systems for wheat hybridisation. We also consider the genetic resources that can be used to alter wheat’s floral development and spike morphology, with a focus on the genetic variation already available. Exploiting these resources can lead to enhanced outcrossing, a key requirement in the progress towards hybrid wheat breeding.

The Research and Simulation Analysis of a New Type of Translational Transmission Device

2014 ◽  
Vol 556-562 ◽  
pp. 1408-1412
Author(s):  
Zhi Qiang Zhang
Keyword(s):  
Modeling And Simulation ◽  
Theoretical Foundation ◽  
Simulation Analysis ◽  
Structural Modeling ◽  
Structural Features ◽  
Practical Application ◽  
Optimization Analysis ◽  
New Type ◽  
Mechanism Parameter ◽  
Relationship Of

In this paper, the following work is done: a new type of translational transmission device is designed; explained in detail are the operating principle, structural features, relationship of mechanism parameter and non interference conditions of the movement; the optimization analysis of transmission device is implemented on the basis of non interference conditions of the bucket movement; structural modeling and simulation analysis are carried out by utilization of Pro/e & Recurdyn; and based on virtual prototype technology, the new type of translational transmission device is verified by experiments, the data of which prove the translational transmission device reasonable and practicable. In conclusion, this paper has laid the theoretical foundation of the practical application of the translational transmission device.

Regulation of cell proliferation patterns by homeotic genes during Arabidopsis floral development

Development ◽  
2000 ◽  
Vol 127 (6) ◽  
pp. 1267-1276 ◽  
Author(s):  
P.D. Jenik ◽  
V.F. Irish
Keyword(s):  
Cell Proliferation ◽  
Apical Meristem ◽  
Floral Development ◽  
Developmental Process ◽  
Cell Layer ◽  
Homeotic Genes ◽  
Transmitting Tract ◽  
Organ Identity ◽  
Element System ◽  
Cell Layers

The shoot apical meristem of Arabidopsis thaliana consists of three cell layers that proliferate to give rise to the aerial organs of the plant. By labeling cells in each layer using an Ac-based transposable element system, we mapped their contributions to the floral organs, as well as determined the degree of plasticity in this developmental process. We found that each cell layer proliferates to give rise to predictable derivatives: the L1 contributes to the epidermis, the stigma, part of the transmitting tract and the integument of the ovules, while the L2 and L3 contribute, to different degrees, to the mesophyll and other internal tissues. In order to test the roles of the floral homeotic genes in regulating these patterns of cell proliferation, we carried out similar clonal analyses in apetala3-3 and agamous-1 mutant plants. Our results suggest that cell division patterns are regulated differently at different stages of floral development. In early floral stages, the pattern of cell divisions is dependent on position in the floral meristem, and not on future organ identity. Later, during organogenesis, the layer contributions to the organs are controlled by the homeotic genes. We also show that AGAMOUS is required to maintain the layered structure of the meristem prior to organ initiation, as well as having a non-autonomous role in the regulation of the layer contributions to the petals.

Some Guidance for Hull Form Selection for SWATH Ships

1988 ◽  
Vol 25 (04) ◽  
pp. 239-252
Author(s):  
G. Robed Lamb
Keyword(s):  
High Speed ◽  
Early Stage ◽  
The United States ◽  
Practical Application ◽  
Hull Form ◽  
Stage Design ◽  
Seakeeping Performance ◽  
The World ◽  
Selection For ◽  
Early Stage Design

Even though in 1987 there were only a dozen SWATH (smali-waterplane-area twin-hull) craft and ships afloat around the world, word of their markedly superior seakeeping performance is spreading rapidly. The number of SWATH vessels is likely to double within five years. As in many other areas of technology, the United States and Japan are the acknowledged leaders in the development and practical application of the SWATH concept. This paper reviews the characteristics of existing SWATH craft and ships from the standpoint of the stated seakeeping objective. Hull form differences between four SWATH craft and ships, including the Navy's SSP Kairnalino, are analyzed and interpreted. Important considerations for the early-stage design of a SWATH ship are discussed. Differences in the range of feasible hull form geometries for coastal areas and unrestricted ocean operations, and for low-speed versus moderately high-speed applications, are pointed out.

scholarly journals The DPOBE Model for Organizational Sustainability: An Exploratory Study about its Structure, Pillars and Components among a Group of Master Degree Students

2020 ◽  
Vol 17 (1) ◽  
pp. 38-52
Author(s):  
Aníbal Areia ◽  
Francisco Esteves ◽  
João Rocha Santos ◽  
Pedro Anunciação
Keyword(s):  
Exploratory Study ◽  
Master's Degree ◽  
Early Stage ◽  
Business Management ◽  
Business Administration ◽  
Organizational Sustainability ◽  
Practical Application ◽  
Master’S Degree ◽  
Practical Implications ◽  
Made In

AbstractResearch purpose. To get a validation of the structure, pillars and components that seem to be central, and under which, business management and managers need to develop abilities and competences to ensure the sustainability of their organizations according to the ‘DPOBE Model for Organizational Sustainability’ structure.Design/Methodology/Approach. For the validation of the structure, pillars and components and it’s practical application to measure the organization’s sustainability level with the referred model, despite the focus group exercise made in an early stage, it’s also important to get a solid opinion about it among managers and also in academia, specifically among teachers and investigators on management, business administration and economics as well near master and doctorate students in this field. In this paper, we analyse the results obtained in an exploratory study, based on a survey made among students from four different master’s degree in several specific areas of business management from the School of Business Administration from the Polytechnic Institute of Setúbal (Portugal).Findings. Main results obtained with this exploratory study let the authors be granted with the developments made so far in the model and its structure, pillars and components. However, only with a major collection of opinions (answer to the survey) from the referred groups, it’s possible to define and adjust the final structure and components of the DPOBE Model.Originality/Value/Practical implications. Being an investigation with several years of development, with several articles, chapters of books, master’s degree thesis, congress presentations and papers made so far, only with a solid and validated structure, pillars and components of the DPOBE Model for Organizational Sustainability, it’s possible to go to its aim, the use of it as a quantitative tool to measure the effective organizations sustainability in a way different from other existing sustainability tools and indexes.

scholarly journals Recent Advances in Non‐nucleophilic Mg Electrolytes

2021 ◽  
Vol 7 ◽  
Author(s):  
Qijie Wu ◽  
Kewei Shu ◽  
Lili Sun ◽  
Haihua Wang
Keyword(s):  
High Performance ◽  
Early Stage ◽  
Oxidation Stability ◽  
Short Review ◽  
High Reactivity ◽  
Inherent Safety ◽  
Practical Application ◽  
Safety Issues ◽  
Ion Structure ◽  
Recent Advances

High-performance electrolyte is still a roadblock for the development of rechargeable magnesium (Mg) batteries. Grignard-type electrolytes were once the only choice in the early stage of rechargeable Mg batteries research. However, due to their nucleophilic nature and high reactivity, Grignard-type electrolytes have inherent safety issues and low oxidation stability, which restrict the development of rechargeable Mg batteries in terms of practical application. Recently, emerging novel Mg battery systems such as Mg-S, Mg-O2/air batteries also require non‐nucleophilic electrolytes with high oxidation stability. This short review summarizes recent advances in non‐nucleophilic Mg electrolytes and aims to provide insights into electrochemical properties and active Mg ion structure of such electrolytes.

Some Effects of Temperature and Light on Floral Initiation and Development in Acacia pycnantha

1985 ◽  
Vol 12 (2) ◽  
pp. 109 ◽  
Author(s):  
M Sedgley
Keyword(s):  
Light Intensity ◽  
Floral Development ◽  
Early Stage ◽  
The Other ◽  
Floral Initiation ◽  
Ambient Conditions ◽  
Low Light ◽  
Floral Primordia ◽  
Effects Of Temperature ◽  
Normal Light

Floral initiation and development in Acacia pycnantha were studied under three environments. Two had ambient southern Australian temperatures of warm summer (mean max. 32°C, mean min. 16°C) and cool winter (mean max. 19°C, mean min. 8°C), one with full sunlight (outside) and the other with 30% light intensity (shadehouse). The other environment (glasshouse) had slightly lower than normal light intensity and a relatively constant year round temperature of mean 28°C maximum and 16°C minimum. Plants were scored for microscopic and macroscopic evidence of floral initiation and development. Floral primordia were initiated all year round under all environments. Floral development proceeded normally under ambient conditions of temperature and light, and anthesis occurred between August and October. Under low light intensity, floral development did not progress beyond a very early stage and macroscopically visible racemes were rare. Under the constant temperatures, floral development proceeded normally up to the stage of microsporogenesis and megasporogenesis. Meiosis did not occur and inflorescence buds ceased growth and were shed from the plant. Plants were transferred between the outside and glasshouse conditions in June, at around the stage of meiosis. Those transferred from outside to the glasshouse did not flower whereas some of those transferred from the glasshouse to outside flowered, but later and for a shorter period than plants maintained outside throughout. It appears that a 70% reduction in sunlight inhibits floral development at an early stage and that temperatures of approximately mean maximum 19°C and minimum 8°C are required for meiosis in Acacia pycnantha.

Magnetically Controlled Reactor Tap Ratio Optimization Research

2013 ◽  
Vol 805-806 ◽  
pp. 1017-1021
Author(s):  
Hai Peng Liu ◽  
Zhong Dong Yin ◽  
Shao Mi Duan
Keyword(s):  
General Formula ◽  
Power Loss ◽  
Reactive Power ◽  
Theoretical Foundation ◽  
Optimal Algorithm ◽  
Response Speed ◽  
Active Power ◽  
Practical Application ◽  
Controllable Reactor ◽  
Ratio Optimization

The tap ratio of magnetic controllable reactor (MCR) has an important influence on the response speed and active power loss. With various applications of MCR, the focuses of MCRs response speed and active power loss are different, which makes the design of the tap ratio different. According to MCRs most widely application--- power system reactive power voltage control---the effect of the tap ratio on the response speed and active power loss was considered. The tap ratio of magnetic controllable reactor was optimized based on the dynamic optimal algorithm of MATLAB, which made the response speed and the active power loss of MCR stay in the equilibrium optimal state, and a general formula was given. Through the simulations of ANSYS and PSCAD software, the feasibility of this theory is verified, and a solid theoretical foundation for the wider practical application of magnetic controllable reactor is provided.

STRATEGIC ENVIRONMENT ASSESSMENT AND BIOLOGICAL DIVERSITY CONSERVATION IN THE KOREAN HIGH-SPEED RAILWAY PROJECT

2005 ◽  
Vol 07 (02) ◽  
pp. 287-298 ◽  
Author(s):  
SANG DON LEE
Keyword(s):  
Biodiversity Conservation ◽  
High Speed ◽  
Biological Diversity ◽  
Developmental Process ◽  
Early Stage ◽  
Amphibian Species ◽  
High Speed Railway ◽  
Ecosystem Conservation ◽  
Environment Assessment ◽  
Development Site

Biological diversity (biodiversity) is an essential issue in conservation and environmental impact assessment (EIA). Though Korea is relatively small, the country harbours over 29,800 species, making biodiversity and ecosystem conservation a central issue when an EIA is undertaken during development site selection. Indeed, an unfavourable biodiversity evaluation can halt a proposed or in-progress development, creating a societal conflict between conservationists and developers. To solve this, the Strategic Environment Assessment (SEA) legislation was created in Korea to provide a systematic instrument for improving decision-making through early-stage environmental assessment. The SEA legislation was recently passed by the President's cabinet and is poised for implementation during 2005. Adoption of the SEA will facilitate better assessments of biodiversity during the early stages of the developmental process, preventing late-stage interruptions such as those seen in the Korean High-speed Railway Project (KHRP), which was recently halted due to poor biodiversity conservation around the development site. The original EIA of the KHRP did not appropriately address the biodiversity issues because most of the developmental plan had been set in place prior to evaluation of biodiversity in the affected areas. The KHRP caused leakage of mountain groundwater such that high elevation wetlands marked as ecosystem conservation areas by the Ministry of Environment became dry and lost their endemic amphibian species. Upon learning this, several national NGOs filed court cases on behalf of the Korean clawed salamander (Onachodaytylus fisheri), halting the project for some time. Thus, the lack of biodiversity consideration at the earliest stages of the KHRP created a social conflict. This paper examines how the implementation of an SEA during the KHRP would have minimised the social conflicts between biodiversity conservation and developmental processes.

Enhancement of dwarf wheat germplasm with high-yield potential derived from induced mutagenesis

2016 ◽  
Vol 16 (1) ◽  
pp. 74-81 ◽  
Author(s):  
Hongchun Xiong ◽  
Huijun Guo ◽  
Yongdun Xie ◽  
Linshu Zhao ◽  
Jiayu Gu ◽  
...  
Keyword(s):  
Yield Components ◽  
Field Experiments ◽  
Wheat Breeding ◽  
Grain Weight ◽  
Yield Potential ◽  
High Yield ◽  
Dwarfing Genes ◽  
Biosynthetic Genes ◽  
Specific Pcr ◽  
1000 Grain Weight

AbstractThe dwarfing wheat (Triticum aestivum L.) breeding has promoted a dramatic increase in yields. Since the utilized dwarfing genes in wheat are very limited, identification of novel dwarfing genes is necessary for improving the genetic diversity of wheat. In this study, more than 300 dwarfing wheat lines from induced mutation were screened by kompetitive allele-specific PCR and gibberellin (GA) treatment. The 17.49% of Rht-D1b and 1.37% of Rht-B1b dwarfing mutants were identified in this mutant group. Additionally, Rht-D1b mutants showed more effective in reduction of plant height and higher 1000-grain weight comparing with that of Rht-B1b mutants. By combing with comparison of yield components and expression profile of GA biosynthetic genes with wild-type, the GA-responsive mutant dm15 without directly involvement in GA metabolism, significantly increased 1000-grain weight but no change of other yield components in two locations of field experiments. Meanwhile, another elite mutant dm11 with change of GA biosynthetic genes expression was also identified. These mutants will be promising candidates for dwarfing wheat breeding.

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