Interrelations in the growth and development of Lolium. I. Some effects of vernalization on growth and development

1965 ◽  
Vol 16 (6) ◽  
pp. 903 ◽  
Author(s):  
JH Silsbury
Keyword(s):  
Low Temperature ◽  
Growth Rates ◽  
Growth And Development ◽  
Growth Curves ◽  
High Growth ◽  
Reproductive Development ◽  
Controlled Environment ◽  
Lolium Rigidum ◽  
Vegetative Phase ◽  
Reproductive Phase

The responses of Lolium rigidum Gaud. and L. perenne L. to low temperature seed vernalization were determined by comparing the growth and development of vernalized and unvernalized plants raised in the field and in a controlled environment cabinet. Vernalization did not appear to influence growth in the vegetative phase, but usually induced earlier heading and a greater proportion of reproductive tillers. Comparisons of vernalized (reproductive) and unvernalized (vegetative) plants show increased reproductive development to be associated with higher growth rates, lower tillering, and greater weight per tiller. High growth rates during the reproductive phase are considered to be due to the ability of reproductive tillers to grow more rapidly than vegetative tillers through the growth of true stem functioning as a "sink" for assimilate. Generalized growth curves for vernalized and unvernalized ryegrass grown under long days are presented and discussed.

Seedling growth of summer-dormant and non-dormant ryegrasses in relation to temperature

1969 ◽  
Vol 20 (3) ◽  
pp. 417 ◽  
Author(s):  
JH Silsbury
Keyword(s):  
Dry Matter ◽  
Growth Curves ◽  
Dry Weight ◽  
Detailed Examination ◽  
Dry Matter Production ◽  
Controlled Environment ◽  
Lolium Rigidum ◽  
Relative Growth ◽  
Lolium Perenne L ◽  
Matter Production

Lolium rigidum Gaud. and a summer-dormant and a non-dormant form of Lolium perenne L. were grown as seedling plants for 32 days in controlled environment cabinets at constant temperatures of either 10, 20, or 30°C and in all cases with a 16-hr photoperiod at a light intensity of 3600 lm ft-2. Sampling at 4-day intervals permitted the detailed examination of dry matter growth curves. Differences in total dry matter production were related to initial differences in seedling dry weight, and the general responses to temperature were similar for each ryegrass. Total dry matter production was greatest at 20°C and lowest at 10°. A temperature of 30° did not induce dormancy in the summer-dormant ryegrass but did depress growth. Relative growth rate fell with time at each temperature.

Low‐temperature cadmium telluride homoepitaxy at high growth rates

1989 ◽  
Vol 65 (5) ◽  
pp. 1932-1935
Author(s):  
N. W. Cody ◽  
U. Sudarsan ◽  
R. Solanki
Keyword(s):  
Low Temperature ◽  
Cadmium Telluride ◽  
Growth Rates ◽  
High Growth

Ge Epitaxy on (100) Ge: High Growth Rates at Low Temperature from GeH4 using N2 as a Carrier Gas

2019 ◽  
Vol 3 (7) ◽  
pp. 209-210 ◽  
Author(s):  
Frederik Leys ◽  
Renaud Bonzom ◽  
Roger Loo ◽  
Antoon Theuwis ◽  
Wilfried Vandervorst ◽  
...  
Keyword(s):  
Low Temperature ◽  
Growth Rates ◽  
High Growth ◽  
Carrier Gas

Temperature and Photoperiod Effects on Onionweed (Asphodelus fistulosus) and Its Potential Range in the United States

1996 ◽  
Vol 10 (4) ◽  
pp. 684-688 ◽  
Author(s):  
David T. Patterson
Keyword(s):  
United States ◽  
Environmental Factors ◽  
Growth And Development ◽  
Reproductive Development ◽  
The United States ◽  
Controlled Environment ◽  
Potential Range ◽  
Leaf Production ◽  
Environmental Responses ◽  
The U.S

Environmental factors that affect the growth and development of onionweed were evaluated in order to predict its potential range and impact in the U.S. In controlled-environment experiments, onionweed achieved 60 to 100% of its maximum vegetative growth at temperatures ranging from 18/11 to 30/23 C day/night. The greatest biomass was produced at day temperatures of 18 or 24 C and night temperatures of 11 or 17 C. Leaf production and reproductive development were greatest at 18/11 C. Plants eventually flowered also at 18/17, 24/17, and 24/11 C but not in any regime with a 30 C-day or a 23 C-night. Flowering occurred earlier in 16-h photoperiods than in 16-h photoperiods than in 8-h photoperiods. Climatic analyses revealed no U.S. analogs of the principal Australian onionweed sites. Based on its environmental responses and its pattern of distribution as a weed in Australia, onionweed will likely remain confined to the southwestern U.S.

scholarly journals Does Corruption Act as a Deterrent to Foreign Direct Investment in Developing Countries?

2020 ◽  
Vol 11 (1) ◽  
pp. 18-34
Author(s):  
Sanjib Guha ◽  
Niazur Rahim ◽  
Bhagaban Panigrahi ◽  
Anh D. Ngo
Keyword(s):  
Growth Rate ◽  
Developing Countries ◽  
Foreign Direct Investment ◽  
Growth Rates ◽  
Growth And Development ◽  
Direct Investment ◽  
High Growth ◽  
High Growth Rate ◽  
Foreign Firms ◽  
Gdp Growth

Developing countries institute policies to attract Foreign Direct Investment (FDI) that promotes growth and development. Corruption disrupts and complicates the implementation of policies that govern the inflows of FDI and the operations of foreign firms; such interference with policies is more than likely to disrupt and lower the inflows of FDI. This paper evaluates whether or not corruption reduces inflows of FDI into each and every developing country. Our study shows that developing countries with high growth rate (> 6% annual GDP growth) attract more FDI than countries with low growth rates although they are both steeped in corruption. Multi-national Corporations (MNCs) seem willing to cope with corruption in countries with high growth rates.

Studies on the productivity of tropical pasture plants. I. Growth analysis, photosynthesis, and respiration of Hamil grass and Siratro in a controlled environment

1968 ◽  
Vol 19 (1) ◽  
pp. 35 ◽  
Author(s):  
MM Ludlow ◽  
GL Wilson
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Growth Rates ◽  
High Growth ◽  
Net Assimilation Rate ◽  
Controlled Environment ◽  
Assimilation Rate ◽  
Relative Growth ◽  
Net Assimilation ◽  
Photosynthesis And Respiration

Hamil grass and Siratro were grown as single plants in pots in controlled environment cabinets at a temperature favouring high growth rates and with adequate water and mineral nutrients. Leaf areas and dry weights of plant parts were recorded in two experiments, to which some of the plants were common. In the first experiment, weekly samples until 4 weeks from sowing provided data for the calculation of relative growth rates, net assimilation rates, and leaf area ratios. The relative growth rate of Hamil grass was almost twice that of Siratro and appears to be the highest yet recorded for any plant. The higher growth rate for the grass resulted from a high net assimilation rate, although the leaf area ratio was lower. The second experiment used Watson and Hayashi's method, in which plants are kept in darkness for a varying number of days to separate net assimilation rate into photosynthetic and respiratory components. Data were collected at 2 and 4 weeks from sowing. The high net assimilation rate of the grass was shown to result from a higher photosynthetic rate, despite a much greater respiration rate than in the legume. The technique used for estimating photosynthesis and respiration is discussed in relation to some of the assumptions that it makes.

HIGH GROWTH-RATE DEPOSITION OF μc-Si:H THIN FILM AT LOW TEMPERATURE WITH VHF-PECVD

2002 ◽  
Vol 16 (28n29) ◽  
pp. 4259-4262 ◽  
Author(s):  
HUIDONG YANG ◽  
CHUNYA WU ◽  
YAOHUA MAI ◽  
HONGBO LI ◽  
YAN LI ◽  
...  
Keyword(s):  
Growth Rate ◽  
Low Temperature ◽  
Growth Rates ◽  
Optical Emission Spectroscopy ◽  
Excitation Frequency ◽  
High Growth ◽  
Optical Emission ◽  
High Growth Rate ◽  
Working Pressure ◽  
The Relationship

High growth rate deposition of μ c - Si:H film with VHF-PECVD at low temperature has been reported. Investigations showed that growth rates enhanced with higher excitation frequency and working pressure, but increased at first then decreased with the increase of plasma power. Optical emission spectroscopy (OES) was introduced to monitor VHF plasma. The relationship between the growth rates and the OES results has been discussed. Raman spectra were also used to study the a - Si:H /μ c - Si:H phase transition. Finally a high growth rate of 2.0nm/s has been obtained through the initially optimized condition.

scholarly journals High ribulose-1,5-bisphosphate carboxylase/oxygenase content in northern diatom species

2019 ◽  
Author(s):  
A. C. Gerecht ◽  
G. K. Eriksen ◽  
M. Uradnikova ◽  
H. C. Eilertsen
Keyword(s):  
Growth Rate ◽  
Low Temperature ◽  
Growth Rates ◽  
Total Protein ◽  
High Growth ◽  
Cellular Protein ◽  
Diatom Species ◽  
Bisphosphate Carboxylase ◽  
Total Cellular Protein

Ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) is a fundamental enzyme in CO2-fixation in photoautotrophic organisms. Nonetheless, it has been recently suggested that the contribution of this enzyme to total cellular protein is low in phytoplankton, including diatoms (< 6%). Here we show that RuBisCO content is high in some diatom species isolated from northern waters (> 69°N). Two species contained the highest RuBisCO levels ever reported for phytoplankton (36% of total protein). These high RuBisCO requirements do not increase these species’ requirements for nitrogen and do not impart a fitness disadvantage in terms of growth rate. On the contrary, high RuBisCO levels in psychrophilic diatoms may be a necessary mechanism to maintain high growth rates at low temperature at which enzymatic rates are low.

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