Cost of apical dominance in two monocarpic herbs, Erysimum strictum and Rhinanthus minor

2000 ◽  
Vol 78 (5) ◽  
pp. 591-599 ◽  
Author(s):  
Ari-Pekka Huhta ◽  
Juha Tuomi ◽  
Pasi Rautio
Keyword(s):  
Apical Dominance ◽  
Fruit Production ◽  
Severe Damage ◽  
Positive Effects ◽  
Vegetative Biomass ◽  
Branch Development ◽  
Rhinanthus Minor ◽  
Delayed Flowering ◽  
The Cost ◽  
Number Of Branches

Apical dominance is advantageous in conditions favoring rapid growth in height and unbranched architecture. The cost of apical dominance, on the other hand, should be expressed in conditions where fecundity increases along with an increasing number of branches. Apical damage can be used to measure such costs: when suppressed meristems are released from apical inhibition, the vegetative and reproductive productivity of initially unbranched plants should increase owing to the regrowth and increased branch development following damage. We studied these regrowth responses in two monocarpic herbs, Erysimum strictum P. Gaertn., B. Mey., and Scherb. and Rhinanthus minor L., after both apical damage (10% of the shoot cut) and more extensive damage (50 and 75% cutting). Both species tolerated apical damage, although severe damage had detrimental effects on the performance of both, especially R. minor. Apical damage had positive effects on most of the measured performance parameters of Erysimum. However, the success of seed germination collapsed, presumably due to delayed flowering and less successful pollination. The response was parallel in Rhinanthus; apical damage affected neither the vegetative biomass nor fecundity, but heavier damage, especially 75% clipping, led to severe reductions in most performance measures. The differences in regrowth responses are presumably due to the different habitat requirements of the species. Rhinanthus prefers relatively dense vegetation and starts to branch and produce flowers after a certain threshold in height has been reached, whereas Erysimum prefers gaps in vegetation. In this species, unbranched architecture may be favored in closed vegetation and branched architecture in less competitive habitats. In both species, fruit production correlated positively with the number of branches in both control and clipped plants, which is consistent with the assumption of the cost of apical dominance.Key words: apical dominance, competition, damage, meristem, overcompensation, regrowth.

scholarly journals DESEMPENHO DO TOMATEIRO EM SISTEMA DE TUTORAMENTO VERTICAL EM ESPIRAL CONDUZIDO COM UMA OU DUAS HASTES

Nativa ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 338
Author(s):  
Juniomar Schmidt ◽  
Caroline Merlo Meneghelli ◽  
Marcelo Rodrigo Krause ◽  
Marcos Vinícius Hell ◽  
Milson Lopes de Oliveira ◽  
...  
Keyword(s):  
Experimental Design ◽  
Lycopersicon Esculentum ◽  
Fruit Production ◽  
Size Class ◽  
Indeterminate Growth ◽  
Driving System ◽  
Lycopersicon Esculentum Mill ◽  
Net Revenue ◽  
The Cost ◽  
Fruit Diameter

O objetivo deste trabalho foi avaliar a viabilidade agroeconômica do tomateiro em sistema de tutoramento vertical em espiral conduzido com uma ou duas hastes por planta. O delineamento foi em blocos casualizados em esquema fatorial 3x2, com quatro repetições, sendo avaliados três métodos de tutoramento: espiral, mexicano e estacas de bambu individuais na vertical e dois sistemas de condução: com uma haste e duas hastes por planta. Avaliou-se a produção de frutos por planta, diâmetro dos frutos, distribuição do número de frutos por classe de tamanho, altura das plantas e de inserção do primeiro cacho e o custo de produção. O método de tutoramento em espiral apresentou produção de frutos por planta semelhante ao método com bambu e superior ao mexicano. Quando as plantas foram conduzidas com uma haste, o diâmetro de frutos obtido no método em espiral foi superior ao método mexicano, entretanto, não diferiu do método com bambu. A receita líquida obtida no método em espiral foi superior à do método mexicano e inferior a do método com bambu. O tutoramento bambu vertical apresenta maior rentabilidade econômica quando comparado aos métodos espiral e mexicano. O tutoramento em espiral pode substituir o tutoramento mexicano, pois apresenta maior rentabilidade, credenciando-se como um novo método de tutoramento para o cultivo de tomate de crescimento indeterminado.Palavras-chave: Lycopersicon esculentum Mill, sistema de condução, crescimento indeterminado. TOMATO PERFORMANCE IN VERTICAL TUNA SYSTEM IN SPIRAL CONDUCTED WITH ONE OR TWO HASTES ABSTRACT:The current study aims to evaluate the agroeconomic viability of the tomato in a spiral vertical steerage system conducted with one or two stems per plant. The experimental design was in a randomized block with a 3x2 factorial, with four replications, and three tutoring methods were evaluated: spiral, Mexican and individual bamboo stakes vertically and two systems of conduction: with oneortwo stems per plant. Fruit production per plant, fruit diameter, number of fruits per size class, height of plants and insertion of the first cluster and the cost of production were evaluated. The spiral tutoring method showed fruit production per plant similar to the method with bamboo and superior to the Mexican one. When the plants were conducted with a stem, the fruit diameter obtained in the spiral method was superior to the Mexican method, however, did not differ from the method with bamboo. The net revenue obtained in the spiral method was higher than the Mexican method and lower than the method with bamboo. The vertical bamboo tufting presents greater economic profitability when compared to the spiral and Mexican methods. The spiral tutoring can replace the Mexican tutoring, since it presents greater profitability, being accredited as a new method of tutoring for the cultivation of undetermined growth tomato.Keywords: Lycopersicon esculentum Mill, driving system, indeterminate growth.

scholarly journals Effects of Using Hazelnut Husk, Wood Shaving and of the Mixture at Different Thicknesses on Broiler Performances, Some Organ Weights, Foot-Pad Dermatitis and Litter Traits

2020 ◽  
Vol 8 (6) ◽  
pp. 1399-1404
Author(s):  
Musa Sarıca ◽  
Kadir Erensoy
Keyword(s):  
Stocking Density ◽  
Litter Type ◽  
Positive Effects ◽  
Wood Shavings ◽  
Broiler Production ◽  
Litter Traits ◽  
Hazelnut Husk ◽  
Wood Shaving ◽  
Foot Pad ◽  
The Cost

This study was carried out to determine the effects of the use of hazelnut husk (HH), wood shavings (WS) and the mixture of 50% hazelnut husk + 50% wood shavings (MIX) in two different thicknesses (4 and 8 cm) as a litter material in broiler production. The experiment was carried out as a factorial experimental design (3 litter type and 2 thickness) and stocking density was 10 chickens per m2. At 6 wk. of age, the effect of litter types and thicknesses on broiler live weights, feed efficiency, and livability, were not significant. Also, no differences were found in terms of gizzard, digestive tract, abdominal fat and edible internal organ weight percentages. While carcass yield varied between litter groups, there was no difference between litter thicknesses. The litter moisture levels at the end of the trial were not affected the litter type and litter thickness, while the foot pad dermatitis (FPD) rates were significantly affected. The highest FPD levels were determined in the HH litter and 4 cm thickness. As a result, the use of HH, WS and MIX of them with a thickness of 4 and 8 cm had no effect on other traits except for FPD levels. It has been observed that these litter materials may be used successfully in broiler production and use of 8 cm thickness litter has minor positive effects except that the cost of litter has doubled.

scholarly journals KNOWLEDGE GAP DAN ADAPTASI LINGKUNGAN KERJA KARYAWAN LOKAL DI HOTEL MILIK ASING

KRITIS ◽  
2017 ◽  
Vol 26 (2) ◽  
pp. 176-193
Author(s):  
Janio Abilio Madeira Soares ◽  
Titi Susilowati Prabawa
Keyword(s):  
Knowledge Transfer ◽  
Learning By Doing ◽  
Qualitative Approach ◽  
Working Environment ◽  
Capital City ◽  
Positive Effects ◽  
Internal Conflicts ◽  
Timor Leste ◽  
The Cost ◽  
Depth Interviews

This research is meant to explore how local employees who work in International hotels in Dili, the capital city of Timor Leste adapt to the working environment. Without enough knowledge about hospitality, they acquire the skills through the knowledge transfer from the senior workers and through learning by doing. This research uses qualitative approach. In order to obtain data, in-depth interviews were done with 16 employees of the two hotels under research, i.e., Novo Turismo Hotel and Timor Plaza hotel. The research finds that kinship value in their working environment helps to accelerate transfer knowledge for the employees in Novo Turismo Hotel dan Timor Plaza. The process brings positive effects to training fund, potentials of internal conflicts and the cost of damages caused by the negligence of local employees.

scholarly journals THE COST OF NEGATIVE INCOME TAX AS A FISCAL MEASURE TO TACKLE POVERTY IN NORTH MACEDONIA

2020 ◽  
Author(s):  
Ivana Velkovska
Keyword(s):  
Income Tax ◽  
Aggregate Demand ◽  
Household Consumption ◽  
Poor People ◽  
Basic Income ◽  
Positive Effects ◽  
Negative Income ◽  
The World ◽  
The Cost ◽  
Negative Income Tax

This paper makes an effort to evaluate the cost of negative income tax as a fiscal measure aiming to tackle the persistent high poverty rate in Macedonia. Poverty, income inequality and unemployment are expected to rise all around the world due to the pandemic corona virus outbreak and the subsequent economic crisis. Governments around the world have already implemented measures similar to universal basic income with the purpose of increasing household consumption and stimulating aggregate demand but also to mitigate the devastating effects that the recent unfavorable economic developments have on the citizens living in poverty or are at the risk of poverty. However, shrinking fiscal spaces of small economies could be an obstacle to implement such policies. Compared to universal basic income, negative income tax is a less costly policy option that targets the population living in poverty instead of providing payments to everyone regardless of their income. The analysis based on the available data is indicating that implementing such policy would cost as much as 9.7 billion MKD per year, which is 4% of the planned state budget revenues for Y2020, 8% of the planned social transfers for Y2020 and 29% of the funds that the state has made available for tackling the COVID 19 crisis so far. In addition, the negative income tax could trigger various positive effects on the economy. Since poor people spend almost all of their income, it could be expected that implementing negative income tax would rise household consumption. According to the empirical analysis in this paper, household consumption is in highest correlation to GDP growth in Macedonia compared to the other explanatory variables (government consumption, investments, import and export).

Conceptual Model of the Subject of Circular Economy in the Context of Sustainable Development

2021 ◽  
pp. 17-27
Author(s):  
Roman Ivanov ◽  
Keyword(s):  
Sustainable Development ◽  
Circular Economy ◽  
Synergistic Effects ◽  
Economic Behavior ◽  
Negative Consequences ◽  
Positive Effects ◽  
Wave Nature ◽  
The Subject ◽  
Methodological Principles ◽  
The Cost

The article deals with certain issues of the introduction and functioning of the circular economy, the introduction of which allows you to obtain positive environmental, economic and social effects. It is noted that it is characterized by the emergence of synergistic effects in the conditions of development of ecological and economic systems, which create conditions for their advancement towards a state of sustainable development. A model of the subject of a circular economy in the context of sustainable development, which reflects the transformative essence, wave nature and cyclical nature of economic processes within the framework of the wave-particle concept of the formation of economic behavior, is proposed and analyzed. The model is formulated in accordance with the methodological principles of describing material flows, which are based on the phenomenological assumption that their kinetics is isomorphic to the dynamics of a continuous medium. The presented construct was named “economic dipole”. The model is built in the state space, the coordinates of which characterize the quantitative and qualitative indicators of the studied subject. The model reflects the self-organizing nature of the management of a circular economy entity, the balance between production and consumption and cyclical movement within the framework of such a circular economy business model as resource recovery. It minimizes the cost of resources by increasing the efficiency of production through reverse flows. The adequacy and information content of the model was checked by analyzing the fields of speed and motivation, the connection of which in the context of sustainable development is represented by the equation of maintaining overall motivation, which consists of a motivating and compensating component. It is shown that the subject of the circular economy is more motivated for sustainable development and overcoming the negative consequences of production than for maintaining the existing state, which reflects the key positive effects of introducing a circular economy.

Cost of apical dominance in two monocarpic herbs, Erysimum strictum and Rhinanthus minor

2000 ◽  
Vol 78 (5) ◽  
pp. 591-599 ◽  
Author(s):  
Ari-Pekka Huhta ◽  
Juha Tuomi ◽  
Pasi Rautio
Keyword(s):  
Apical Dominance ◽  
Rhinanthus Minor

scholarly journals Why licensing authorities need to consider the net value of new drugs in assigning review priorities: Addressing the tension between licensing and reimbursement

2008 ◽  
Vol 24 (02) ◽  
pp. 140-145 ◽  
Author(s):  
Christopher McCabe ◽  
Karl Claxton ◽  
Anthony O'Hagan
Keyword(s):  
Market Access ◽  
Decision Rules ◽  
Healthcare Systems ◽  
New Drugs ◽  
Priority Review ◽  
Pharmaceutical Companies ◽  
Net Benefit ◽  
Positive Effects ◽  
The Cost ◽  
Do So

Pharmaceutical regulators and healthcare reimbursement authorities operate in different intellectual paradigms and adopt very different decision rules. As a result, drugs that have been licensed are often not available to all patients who could benefit because reimbursement authorities judge that the cost of therapies is greater than the health produced. This finding creates uncertainty for pharmaceutical companies planning their research and development investment, as licensing is no longer a guarantee of market access. In this study, we propose that it would be consistent with the objectives of pharmaceutical regulators to use the Net Benefit Framework of reimbursement authorities to identify those therapies that should be subject to priority review, that it is feasible to do so and that this would have several positive effects for patients, industry, and healthcare systems.

The Factors Analysis about Comprehensive Utilization Effects of the Straws in the Huang-Huai Plain

2011 ◽  
Vol 361-363 ◽  
pp. 794-798
Author(s):  
Ying Quan ◽  
Ping Yang ◽  
Shi Jian Wu
Keyword(s):  
Family Income ◽  
Cost Effective ◽  
Farming System ◽  
Farm Income ◽  
Population Number ◽  
Industry Development ◽  
Comprehensive Utilization ◽  
Positive Effects ◽  
Political Conditions ◽  
The Cost

We established multiple regression models by on-site survey on 3090 famers’ family in 139 counties in 4 provinces in the Huang-Huai plain, comprehensively analyzing the factors which affect the utilization of farmer's straw. Research results indicate that, some factors such as family agricultural labor population number, and family income level, and masters’ political conditions, and duties in village, and education life, and straw using technology master situation, and straw using cognitive and farming area, and farming system, and straw subsidies, and straw industry development have positive effects on straw comprehensive utilization, while the factors like part-time work degree, and domestic livestock culture situation, and the cost-effective of using straw have negative effects on straw comprehensive utilization. These factors like straw subsidies, the cost-effective of using straw, straw using cognitive, straw utilization technology, family farm income, farm area have significant impact on farmer's straw utilization; masters’ political conditions, duties in village, education life, family livestock culture situation, straw industry development make little influences. To increase the level of farmer's straw comprehensive utilization, there are some measures to take: Party members and leaders of the village further play the exemplary role apart from raising the awareness of farmers on crop straw; conscientiously implement the State subsidy policies about straw; implement straw utilization technology innovation, actively promote straw utilization technology; promote the realization of straw resources and commercialization to improve farmers’ income.

The Coming Epidemic of Neurologic Disorders: What Science Is – and Should Be – Doing About It

Daedalus ◽  
2012 ◽  
Vol 141 (3) ◽  
pp. 98-107 ◽  
Author(s):  
Gregory A. Petsko
Keyword(s):  
Sharp Increase ◽  
The United States ◽  
Severe Damage ◽  
Age Related ◽  
Medical Need ◽  
Neurologic Disorders ◽  
Parkinson’S Diseases ◽  
The Central Nervous System ◽  
Susceptible Populations ◽  
The Cost

The Earth's population is aging fast, and the coming sharp increase in the number of people over age sixty-five will bring with it an epidemic of age-related neurodegenerative diseases, such as Alzheimer's and Parkinson's diseases. Currently, no cures exist for the major neurologic disorders. Unless cures can be found, by 2050 the cost of these diseases will exceed $1 trillion annually in the United States, and the burden for other countries will scale with their populations. Despite exciting advances in our understanding of these diseases, both government research funding and the efforts of industry have failed to keep pace with this unmet medical need. Private philanthropy has done better, but the total dollars spent on developing diagnostics and therapeutics for neurologic disorders still lags far behind that spent on much less prevalent diseases. The challenge for biomedical research in the next forty years is to identify markers that would allow early detection of high-risk cohorts, and to develop therapies that either will prevent the diseases from starting at all in susceptible populations or will arrest their progression before severe damage to the central nervous system has occurred.

scholarly journals Manner of Apical Meristem Destruction Affects Growth, Reproduction, and Survival of Sea Oxeye Daisy

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Lisa S. Spirko ◽  
Anthony M. Rossi
Keyword(s):  
Apical Dominance ◽  
Apical Meristem ◽  
Gall Midge ◽  
Nitrogen Supplementation ◽  
Borrichia Frutescens ◽  
Ripening Time ◽  
Seed Head ◽  
Different Types ◽  
And Performance ◽  
Delayed Flowering

Although herbivory may result in plant death, the mode and timing of damage may produce variable wounding responses in the attacked plant. In this study, effects of different types of apical meristem damage on growth and performance of sea oxeye daisy Borrichia frutescens (L.) DC were compared. Damage involved either clipping or galling of the apical meristem by the gall midge Asphondylia borrichiae Rossi and Strong. Apical dominance was relatively weak before flowering and stronger in short ramets that were shaded by taller neighbors later in the season. Clipped ramets delayed sprouting new stems, and galled ramets sprouted new stems quickly compared to intact ramets, but final stem counts were similar across treatments. Clipping significantly delayed flowering, reduced seed head ripening time, and resulted in fewer seed heads and seeds. Galling did not significantly impact reproduction compared to intact ramets. Nitrogen supplementation significantly increased stem count and seed count and lengthened seed ripening time. Borrichia frutescens responds differently to clipping versus galling by A. borrichiae and better tolerates galling in terms of nonreproductive performance and survival. Galling from A. borrichiae likely prevents Borrichia frutescens from flowering, which suggests resource regulation of meristems by the midge.

Sign in / Sign up

Export Citation Format

Share Document