scholarly journals The Growth Responses of Rice Plant to Environmental Conditions : VI. The effect of temperature during panicle development on the heading dates

1977 ◽  
Vol 46 (2) ◽  
pp. 239-242 ◽  
Author(s):  
Kanoe SATO
Keyword(s):  
Environmental Conditions ◽  
Rice Plant ◽  
Effect Of Temperature ◽  
Growth Responses ◽  
Panicle Development

scholarly journals Whole-body imaging of neural and muscle activity during behavior in Hydra: bidirectional effects of osmolarity on contraction bursts

2019 ◽  
Author(s):  
Wataru Yamamoto ◽  
Rafael Yuste
Keyword(s):  
Nervous System ◽  
Body Size ◽  
Neuronal Activity ◽  
Environmental Conditions ◽  
Muscle Activity ◽  
Muscle Cells ◽  
Major Effect ◽  
Whole Body ◽  
Effect Of Temperature ◽  
Whole Body Imaging

AbstractThe neural code relates the activity of the nervous system to the activity of the muscles to the generation of behavior. To decipher it, it would be ideal to comprehensively measure the activity of the entire nervous system and musculature in a behaving animal. As a step in this direction, we used the cnidarian Hydra vulgaris to explore how physiological and environmental conditions alter the activity of the entire neural and muscle tissue and affect behavior. We used whole-body calcium imaging of neurons and muscle cells and studied the effect of temperature, media osmolarity, nutritional state and body size on body contractions.In mounted Hydra, changes in temperature, nutrition or body size did not have a major effect on neural or muscle activity, or on behavior. But changes in media osmolarity altered body contractions, increasing them in hipo-osmolar media solutions and decreasing them in hyperosmolar media. Similar effects were seen in ectodermal, but not in endodermal muscle. Osmolarity also bidirectionally changed the activity of contraction bursts neurons, but not of rhythmic potential neurons.These findings show osmolarity-dependent changes in neuronal activity, muscle activity, and contractions, consistent with the hypothesis that contraction burst neurons respond to media osmolarity, activating ectodermal muscle to generate contraction bursts. This dedicated circuit could serve as an excretory system to prevent osmotic injury. This work demonstrates the feasibility of studying the entire neuronal and muscle activity of behaving animals.Significance StatementWe imaged whole-body muscle and neuronal activity in Hydra in response to different physiological and environmental conditions. Osmolarity bidirectionally altered Hydra contractile behavior. These changes were accompanied by corresponding changes in the activity of one neuronal circuit and one set of muscles. This work is a step toward comprehensive deciphering of the mechanisms of animal behavior by measuring the activity of all neurons and muscle cells.

scholarly journals Red hot maples: Acer rubrum first-year phenology and growth responses to soil warming

2017 ◽  
Vol 47 (2) ◽  
pp. 159-165 ◽  
Author(s):  
J.A. Wheeler ◽  
N.M. Gonzalez ◽  
K.A. Stinson
Keyword(s):  
Biomass Allocation ◽  
Environmental Conditions ◽  
Acer Rubrum ◽  
Growing Season ◽  
Tree Seedlings ◽  
Red Maple ◽  
Growth Responses ◽  
Soil Warming ◽  
Leaf Production ◽  
Trade Offs

Microhabitat environmental conditions are an important filter for seedling establishment, controlling the availability of optimal recruitment sites. Understanding how tree seedlings respond to warming soil temperature is critical for predicting population recruitment in the future hardwood forests of northeastern North America, particularly as environmental conditions and thus optimal microhabitat availabilities change. We examined the effect of soil warming of 5 °C during the first growing season on germination, survival, phenology, growth, and stem and root biomass allocation in Acer rubrum L. (red maple) seedlings. While there was no effect of soil warming on germination or survival, seedlings growing in warmer soils demonstrated significantly accelerated leaf expansion, delayed autumn leaf senescence, and an extended leaf production period. Further, seedlings growing in warmer soils showed larger leaf area and stem and root structures at the end of the first growing season, with no evidence of biomass allocation trade-offs. Results suggest that A. rubrum seedlings can capitalize on soil warming by adjusting leaf phenology and leaf production, resulting in a longer period of carbon uptake and leading to higher overall biomass. The absence of growth allocation trade-offs suggests that A. rubrum will respond positively to increasing soil temperatures in northeastern forests, at least in the early life stages.

scholarly journals Effect of temperature and carpel size during pre-anthesis on potential grain weight in wheat

1999 ◽  
Vol 132 (4) ◽  
pp. 453-459 ◽  
Author(s):  
D. F. CALDERINI ◽  
L. G. ABELEDO ◽  
R. SAVIN ◽  
G. A. SLAFER
Keyword(s):  
Heat Treatment ◽  
Environmental Conditions ◽  
Buenos Aires ◽  
Grain Weight ◽  
Effect Of Temperature ◽  
Sowing Dates ◽  
Short Period ◽  
Background Temperature ◽  
Higher Temperature ◽  
Maximum Temperatures

The effect of environmental conditions immediately before anthesis on potential grain weight was investigated in wheat at the experimental field of the Faculty of Agronomy (University of Buenos Aires, Argentina) during 1995 and 1996. Plants of two cultivars of wheat were grown in two environments (two contrasting sowing dates) to provide different background temperature conditions. In these environments, transparent boxes were installed covering the spikes in order to increase spike temperature for a short period (c. 6 days) immediately before anthesis, i.e. between ear emergence and anthesis. In both environments, transparent boxes increased mean temperatures by at least 3·8 °C. These increases were almost entirely due to the changes in maximum temperatures because minimum temperatures were little affected. Final grain weight was significantly reduced by higher temperature during the ear emergence–anthesis period. It is possible that this reduction could be mediated by the effect of the heat treatment on carpel weight at anthesis because a curvilinear association between final grain weight and carpel weight at anthesis was found. This curvilinear association may also indicate a threshold carpel weight for maximizing grain weight.

scholarly journals Strigolactones as mediators of plant growth responses to environmental conditions

2011 ◽  
Vol 6 (1) ◽  
pp. 37-41 ◽  
Author(s):  
Hinanit Koltai ◽  
Yoram Kapulnik
Keyword(s):  
Plant Growth ◽  
Environmental Conditions ◽  
Growth Responses

Effect of Temperature on the Growth Response of Salmonella Enteritidis Inoculated onto the Vitelline Membranes of Fresh Eggs

2003 ◽  
Vol 66 (8) ◽  
pp. 1368-1373 ◽  
Author(s):  
G. J. FLEISCHMAN ◽  
C. L. NAPIER ◽  
D. STEWART ◽  
S. A. PALUMBO
Keyword(s):  
Salmonella Enteritidis ◽  
Growth Response ◽  
Effect Of Temperature ◽  
Vitelline Membrane ◽  
Growth Responses ◽  
In Ovo ◽  
Maximum Increase ◽  
Comparison Of The Results ◽  
As If

The growth response of Salmonella Enteritidis (SE) on the vitelline membrane in vitro was studied with the use of a special tube devised specifically for the inoculation of SE onto the vitelline membrane and for the sampling of the yolk near the inoculation site. This latter ability allowed the detection of the movement of SE into the yolk. The growth of SE on the membrane was compared with that of SE inoculated into yolk and albumen in vitro and in ovo in fresh in-shell eggs. The incubation time was 2 days, and the incubation temperatures were 4, 8, 15, 27, and 37°C. Comparison of the results obtained for in vitro growth showed that at 4, 8, and 15°C, SE behaved as if it were in the albumen, with its numbers decreasing over time. At 27 and 37°C, SE grew as if it were in yolk, with a maximum increase of 4.5 log CFU after 2 days at 37°C. In no experiments involving growth on the vitelline membrane did SE appear in the yolk. Comparisons between in vitro and in ovo growth responses of SE in yolk and albumen indicate that SE growth on the membrane parallels that in the in-shell egg.

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