EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


Patterns in the Dieffenbachia Plant

December 27, 2022

Menashe_varegation_Picture1

Menashe_varegation_Picture2

Photographer: Menashe Davidson

Summary Author: Menashe Davidson

In our apartment-garden, located in the city Rishon-LeZion, Israel, we
grow in containers about 100 species of plants. Annuals and perennials,
low plants, bushes, climbers and trees. Most of them flowering
ornamentals, for the beauty of their seasonal bloom. But the most
prominent plant, all the yearlong and not just seasonal, is the
Dieffenbachia seguine plant, known as dumb cane from the family
Araceae. The focal point of a dieffenbachia is the beautiful patterns
of the foliage, which are variegated, all year long if properly
cultivated.

Variegation is the appearance of differently colored zones pf a
plants’ leaves. Dieffenbachia leaves, are generally large and ovate,
have irregular areas of splotches with lighter green, yellow or even
cream color. In the first picture we already see the patterns appear on
the eternal juvenile leaf of the vegetative bud. It then maintains this
same appearance regardless of the plants’ age (second picture).

The variegation is caused by mutations that affect chlorophyll
production. This is 'built' into the plant DNA. Note that in some
portions of the leaf tissues there’s a lack of chlorophyll pigments.
The purpose of variegation is still a matter of debate. Regardless,
gardeners enjoy harnessing the pattern traits that produce the most
desirable, eye-catching plants.


Rishon-LeZion, Israel Coordinates: 31.9730, 34.7925


Related EPODs

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Plant Links

* Discover Life
* Tree Encyclopedia
* What are Phytoplankton?
* Encyclopedia of Life - What is a Plant?
* USDA Plants Database
* University of Texas Native Plant Database
* Plants in Motion
* What Tree is It?

-
Earth Science Picture of the Day is a service of the Universities
Space Research Association.

https://epod.usra.edu

--- up 43 weeks, 1 day, 20 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)

EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


Glacial Striations in Victoria, British Columbia

November 25, 2022


L1005811

Photographer: Joe LaCour

Summary Author: Joe LaCour

Just a few hundred meters southeast and across the street from where
the Coho ferry docks in downtown Victoria, British Columbia,
you can see a great example of the power of the glaciers from a
previous ice age. Some 15,000 years ago, a glacier flowed over what
is now Victoria. The surface of the outcrop shown above was
grooved, scratched, and polished by the cutting action of pebbles
and boulders dragged along like a piece of giant sandpaper frozen to
the bottom a glacier. This fascinating ice age relic might be easy to
miss as the attention of many passers-by is captured by the striking
Legislative Parliament Building (not in photo). Note that the
bronze plaque in the foreground - Glacial Grooves and Striations
- acknowledges Victoria's glacial history.

Photo details: Leica M9 Digital camera; 35mm Summicron lens; f13; 1/60
second exposure; ISO320; processed with DxO PhotoLab.


Victoria, British Columbia, Canada Coordinates: 48.4284, -123.3656


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Glacial Striations in Victoria, British Columbia Below the
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Geography Links

* Atlapedia Online
* CountryReports
* GPS Visualizer
* Holt Rinehart Winston World Atlas
* Mapping Our World
* Perry-Castañeda Library Map Collection
* Types of Land
* World Mapper

-
Earth Science Picture of the Day is a service of the Universities
Space Research Association.

https://epod.usra.edu

--- up 38 weeks, 6 days, 21 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)

EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


Crepuscular Rays Observed from Turin, Italy

September 27, 2022

Crepuscular rays_resize

Photographer: Piero Armando

Summary Authors: Piero Armando; Jim Foster
The setting Sun behind the peaks of the Orsiera-Rocciavrè Massif,
cast this impressive set of crepuscular rays over Turin, Italy.
Though most often associated with clouds, gaps in mountain peaks can
also produce lanes of shadow and sunlight. However, there must be
sufficient aerosols in the atmosphere in order to result in the
dramatic effect shown above. Note it's perspective that seems to
make the rays converge near the horizon. Photo taken on September 9,
2022.

Photo details: Canon EOS 600D camera;1/1250 sec. exposure; f/7; ISO
100; 180 mm focal length.

Turin, Italy Coordinates: 45.0703, 7.6869


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Observed from Mutare, Zimbabwe in 2022
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Atmospheric Effects Links

* Atmospheric Optics
* Optic Picture of Day: Gruppo Astrofili Galileo Galilei
* Color and Light in Nature
* The Colors of Twillight and Sunset
* Refraction Index
* Image Gallery: Atmospheric Effects
* What is a Rainbow?

-
Earth Science Picture of the Day is a service of the Universities
Space Research Association.

https://epod.usra.edu

--- up 30 weeks, 1 day, 21 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)