A genetic analysis of the photosynthetic properties of populations of Danthonia spicata that have different growth responses to light level

Oecologia ◽  
1984 ◽  
Vol 64 (1) ◽  
pp. 74-77 ◽  
Author(s):  
Samuel M. Scheiner ◽  
Jessica Gurevitch ◽  
James A. Teeri
Keyword(s):  
Genetic Analysis ◽  
Light Level ◽  
Growth Responses ◽  
Photosynthetic Properties ◽  
Danthonia Spicata

Effects of light regime on the growth and physiology of Pentaclethra macroloba (Mimosaceae) in Costa Rica

1985 ◽  
Vol 1 (4) ◽  
pp. 303-320 ◽  
Author(s):  
Steven F. Oberbauer ◽  
Boyd R. Strain
Keyword(s):  
Costa Rica ◽  
Stomatal Density ◽  
Structural Characteristics ◽  
Sudden Change ◽  
Light Level ◽  
Leaf Damage ◽  
Growth Responses ◽  
Pentaclethra Macroloba ◽  
Partial Shade ◽  
Treefall Gap

ABSTRACTSeedlings of Pentaclethra macroloba (Willd.) Kuntze, a dominant, shade-tolerant species of tropical moist forest in Costa Rica, were raised under three light conditions to assess their acclimatization and growth responses to irradiance. The light environments used were full sun, partial shade (25% of full sun), and full shade (1% of full sun). To test the effect of a sudden change in light level such as would occur in the event of a treefall gap, the seedlings in the above conditions were switched between environments after two months and grown for an additional 1.5 months. Plants in full sun and partial shade had similar total weight; switching between the two environments had no effect on biomass. Plants switched from full sun and partial shade to full shade had negative growth as a result of negative CO2, flux and leaf abscission. Plants transferred from full shade to full sun had lower growth rates than those switched from full shade to partial shade because of severe leaf damage in full sun. The previous environment significantly affected the response of most growth and size characteristics to the present environment. Maximum photosynthesis changed only 30% in response to light level during growth. However, large changes in other photosynthetic and structural characteristics were found. Leaves developed in full shade had lower respiration, leaf thickness, and stomatal density and higher apparent quantum yield, specific leaf area, and chlorophyll content than leaves from full sun. Osmotic potentials were similar between treatments. Despite only small changes in maximum photosynthesis, acclimatization to extreme shade or sun rendered leaves unsuitable for large changes in environment. Consequently, in the event of a large treefall gap, plants already present in the understory will require a substantial period of adjustment before they respond to the increase in light.

Effects of elevated atmospheric carbon dioxide, soil nutrients and water conditions on photosynthetic and growth responses of Alnus hirsuta

2011 ◽  
Vol 38 (9) ◽  
pp. 702 ◽  
Author(s):  
Hiroyuki Tobita ◽  
Akira Uemura ◽  
Mitsutoshi Kitao ◽  
Satoshi Kitaoka ◽  
Yutaka Maruyama ◽  
...  
Keyword(s):  
Elevated Co2 ◽  
Biomass Allocation ◽  
Environmental Changes ◽  
Soil Conditions ◽  
Soil Drought ◽  
N Availability ◽  
P Availability ◽  
Growth Responses ◽  
Alnus Hirsuta ◽  
Photosynthetic Properties

The objective of this paper is to clarify the effects of multiple environmental conditions, elevated atmospheric CO2 concentration ([CO2]) and soil conditions on the physiological and morphological properties of Alnus hirsuta Turcz., an N2-fixing species, to predict its responses to environmental changes. We examined the responses of photosynthetic properties, leaf characteristics, biomass and N allocation of A. hirsuta to elevated [CO2], soil N and phosphorus availability, and soil drought by using the results of two experiments. The effects of P availability were more marked than those of N availability and soil drought. The photosynthetic responses of A. hirsuta to elevated [CO2] under high P were considered to be ‘photosynthetic acclimation’, while A. hirsuta presented the obvious ‘photosynthetic downregulation’ to elevated [CO2] under low P. Soil P availability affected the growth responses to elevated [CO2] through effects on these photosynthetic properties and biomass allocation. Though elevated [CO2] caused no marked change in the allometric relationships in biomass, with some exceptions, the responses of N allocation among tissue to elevated [CO2] differed from those of biomass allocation. These results suggest that it is necessary to evaluate N mass allocation as well as biomass when we consider the N2-fixing ability of Alnus under elevated [CO2].

scholarly journals Effect of Shading and Water Stress on Growth of `Campbell Early' Grape (Vitis hybrid)

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 849B-849
Author(s):  
In-Chang Son ◽  
Jae-Hyuk Park ◽  
Seon-Kyu Kim*
Keyword(s):  
Soil Moisture ◽  
Water Stress ◽  
Soil Moisture Content ◽  
Gradual Increase ◽  
Starch Content ◽  
Light Stress ◽  
Sharp Decrease ◽  
Light Level ◽  
Growth Responses ◽  
Soil Water Stress

Three-year-old `Campbell Early' grapevines were subjected to 4 levels of shading (0, 30, 60, and 90%) combined with 3 levels of soil moisture content (12, 34.6, and 100 kPa), and their growth responses were examined. Increase in shoot length of vines grown without soil water stress (12 kPa and 34.6 kPa) and light stress (non-shading and 30% shading) was higher than those grown under 100 kPa and heavy shading. Leaf number showed a gradual increase in proportion to decreasing shading and increasing light level, showing some overgrowth with 30% shading. Leaf area increment of vines with sufficient soil moisture (12 kPa) was the highest, but 30% shading reduced the rate by one half. Chlorophyll content of vine leaves grown under 12 kPa or 34.6 kPa increased regardless of shading level, but that of 30% shading became more important after 30 days. The qP and qN values of vines grown under 12 kPa and 34.6 kPa decreased with the shading level, and under 100 kPa, even non-shading vines showed a drastic decrease. When grown under 12 kPa, photosynthetic rate of non-shaded vines was higher than shaded vines, but when water-stressed, that of non-shaded vines showed a sharp decrease. Increasing shading and water stress level resulted in decrease of sucrose and starch content and increase of reducing sugar.

Software pattern recognition applied to nanodiffraction patterns from a STEM instrument

1986 ◽  
Vol 44 ◽  
pp. 694-695
Author(s):  
G.Y. Fan ◽  
J.M. Cowley
Keyword(s):  
Image Processing ◽  
Pattern Recognition ◽  
Computer Software ◽  
Processing System ◽  
Light Level ◽  
Host Computer ◽  
Low Light ◽  
Image Processing System ◽  
Recent Developments ◽  
On Line

In recent developments, the ASU HB5 has been modified so that the timing, positioning, and scanning of the finely focused electron probe can be entirely controlled by a host computer. This made the asynchronized handshake possible between the HB5 STEM and the image processing system which consists of host computer (PDP 11/34), DeAnza image processor (IP 5000) which is interfaced with a low-light level TV camera, array processor (AP 400) and various peripheral devices. This greatly facilitates the pattern recognition technique initiated by Monosmith and Cowley. Software called NANHB5 is under development which, instead of employing a set of photo-diodes to detect strong spots on a TV screen, uses various software techniques including on-line fast Fourier transform (FFT) to recognize patterns of greater complexity, taking advantage of the sophistication of our image processing system and the flexibility of computer software.

Low-light-level three-dimensional video microscope with long working distance objective lenses

1994 ◽  
Vol 52 ◽  
pp. 226-227
Author(s):  
W. Lin ◽  
J. Gregorio ◽  
T.J. Holmes ◽  
D. H. Szarowski ◽  
J.N. Turner
Keyword(s):  
Three Dimensional ◽  
Light Level ◽  
Stereo Pair ◽  
Light Illumination ◽  
Initial Image ◽  
Low Light ◽  
Image Recording ◽  
Depth Discrimination ◽  
Video Microscope ◽  
Working Distance

A low-light level video microscope with long working distance objective lenses has been built as part of our integrated three-dimensional (3-D) light microscopy workstation (Fig. 1). It allows the observation of living specimens under sufficiently low light illumination that no significant photobleaching or alternation of specimen physiology is produced. The improved image quality, depth discrimination and 3-D reconstruction provides a versatile intermediate resolution system that replaces the commonly used dissection microscope for initial image recording and positioning of microelectrodes for neurobiology. A 3-D image is displayed on-line to guide the execution of complex experiments. An image composed of 40 optical sections requires 7 minutes to process and display a stereo pair.The low-light level video microscope utilizes long working distance objective lenses from Mitutoyo (10X, 0.28NA, 37 mm working distance; 20X, 0.42NA, 20 mm working distance; 50X, 0.42NA, 20 mm working distance). They provide enough working distance to allow the placement of microelectrodes in the specimen.

Genetic analysis of a Japanese patient with butyrylcholinesterase deficiency

1997 ◽  
Vol 61 (6) ◽  
pp. 491-496 ◽  
Author(s):  
K. HIDAKA ◽  
I. IUCHI ◽  
M. TOMITA ◽  
Y. WATANABE ◽  
Y. MINATOGAWA ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Japanese Patient

An autopsy case of gallbladder cancer developing in a Japanese man with cerebrotendinous xanthomatosis: genetic analysis of the sterol 27-hydroxylase and p53 genes

Pathology ◽  
2003 ◽  
Vol 35 (2) ◽  
pp. 141-144 ◽  
Author(s):  
Hiroya Kato ◽  
Sukenari Koyabu ◽  
Shigenori Aoki ◽  
Takuya Tamai ◽  
Masahiro Sugawa ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Gallbladder Cancer ◽  
Cerebrotendinous Xanthomatosis ◽  
Autopsy Case ◽  
P53 Genes

Genetic analysis of non-toxic liver fibrosis in a congenic mouse intercross

2016 ◽  
Vol 54 (08) ◽  
Author(s):  
R Hall ◽  
K Hochrath ◽  
F Grünhage ◽  
F Lammert
Keyword(s):  
Liver Fibrosis ◽  
Genetic Analysis ◽  
Congenic Mouse

Genetic analysis of congenital myasthenic syndromes (CMS)

2005 ◽  
Vol 36 (02) ◽  
Author(s):  
A Abicht ◽  
JS Müller ◽  
SK Baumeister ◽  
U Schara ◽  
A Hübner ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Congenital Myasthenic Syndromes ◽  
Myasthenic Syndromes
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