Login

Join for Free!
114504 members


Purple Plant?

Plants!

Moderator: BioTeam

Purple Plant?

Postby Navin » Mon May 15, 2006 9:44 am

I have a plant at home- the Tradescantia purpurea whose leaves are completely purple when placed in direct sunlight. However when placed in a shaded area, the leaves tend to become green. Can anyone explain this?

Also, how is the plant able to photosynthesize if the whole plant is purple? I know that in normal variegated leaves, there are green areas that can carry out pohtosynthesis, but in this plant, there are no green areas visible at all - event the stem is purple! So how does it photosynthesize?
Botany is the study of what? Bottoms!
User avatar
Navin
Coral
Coral
 
Posts: 277
Joined: Thu Jun 09, 2005 2:23 pm
Location: Singapore (Asia Pacific)

Postby Linn » Wed May 17, 2006 2:52 am

Navin
when the plant is in the shade the pigment that is responsable for the color purple is not reflecting as much of the light wavelength which makes it appear purple, as when it is in the sun.

the green color is not seen because the chlorophyll is being hidden by the other color pigments.

Photosynthesis can work fine with non-green catalysts too .
~Lynne
"How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in life you will have been all of these".

~ George washington Carver
User avatar
Linn
King Cobra
King Cobra
 
Posts: 1735
Joined: Sun Jan 22, 2006 3:53 am
Location: Massachusetts, USA

Postby Navin » Mon May 29, 2006 12:01 pm

Here is a picture for your amusement.
Attachments
DSC01942.JPG
(305.55 KiB) Downloaded 123 times
Botany is the study of what? Bottoms!
User avatar
Navin
Coral
Coral
 
Posts: 277
Joined: Thu Jun 09, 2005 2:23 pm
Location: Singapore (Asia Pacific)


Postby Linn » Mon May 29, 2006 12:42 pm

I have them all over my yard :lol:
although they are green leaved. Want any more??? :lol:
"How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in life you will have been all of these".

~ George washington Carver
User avatar
Linn
King Cobra
King Cobra
 
Posts: 1735
Joined: Sun Jan 22, 2006 3:53 am
Location: Massachusetts, USA

Postby tupistra » Mon Aug 07, 2006 1:38 am

hey guys!
I'm a rookie here,and my mother tongue is not English,so it is a little difficulty for me to give some comments .But this topic is very interesting.I also find in the field that flowers in the mountain are always purple.Someone said in the mountain ,the altitute is high,and ultraviolet radiation is strong,so purple flowers can resist the hurt of ultraviolet radiation .Do you think it's right?
tupistra
Garter
Garter
 
Posts: 3
Joined: Sun Aug 06, 2006 2:32 pm

Postby MrMistery » Mon Aug 07, 2006 6:33 pm

Might be. the human skin works in that exact way with melanin synthesis. But are sure that the UV intensity is higher there? Because this sounds a little strange to me. This sounds just like a PhD thesys(and someone probably did it)"Role of purple pigmentation in mountain-dwelling angiosperms"
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
User avatar
MrMistery
Inland Taipan
Inland Taipan
 
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)

Postby tupistra » Wed Aug 09, 2006 8:57 am

Thank you for your cue!
I'm sure the UV is very strong on the mountain here.Because the altitute almost get 3700-4000 meters, and people lived there have black skin. There are more purple flowers than white or other colours.You means some doctor do the work about this aspect ?Were there some papers published about it?I think it's very complex,maybe it's also for pollination ,easily identified by the pollinatior.
tupistra
Garter
Garter
 
Posts: 3
Joined: Sun Aug 06, 2006 2:32 pm

Postby Linn » Sat Aug 12, 2006 3:24 am

tupistra wrote:hey guys!
I'm a rookie here,and my mother tongue is not English,so it is a little difficulty for me to give some comments .But this topic is very interesting.I also find in the field that flowers in the mountain are always purple.Someone said in the mountain ,the altitute is high,and ultraviolet radiation is strong,so purple flowers can resist the hurt of ultraviolet radiation .Do you think it's right?


I have not heard that purple colored flowers resist radiation more than other colors. (not saying they dont..I just never before heard that.)

On some of the higher mountains the light intensity can be 4x greater.
So the plants do have nechanisms to protect them.

I think white flowers would better reflect light if this were the case.
Usualy plants foliage that is purple is found where light is lower.

So I think that your observation that some mountains have mostly purple flowers are probably indicitive of isolation. I am just a rookie too (2 academic years only) but life long hobbiest. :)

Some really beautiful and unique flowers are found on mountains, For example the Blue Poppy from the Himalayan Mountains:

http://www.ubcbotanicalgarden.org/potd/ ... s_beto.php
"How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in life you will have been all of these".

~ George washington Carver
User avatar
Linn
King Cobra
King Cobra
 
Posts: 1735
Joined: Sun Jan 22, 2006 3:53 am
Location: Massachusetts, USA

Postby tupistra » Sat Aug 12, 2006 8:52 am

very beautiful flower!I have saw it on the mountain before.There are also many unique flowers like it ,which only can find on the high altitute mountain , such as Gentiana.
http://www.kminvest.cn/oledit/UploadFil ... 011699.JPG
tupistra
Garter
Garter
 
Posts: 3
Joined: Sun Aug 06, 2006 2:32 pm


Return to Botany Discussion

Who is online

Users browsing this forum: No registered users and 0 guests

cron