Login

Join for Free!
119237 members


chemoheterotrophic plants

Plants!

Moderator: BioTeam

chemoheterotrophic plants

Postby Jules19 » Mon Jan 18, 2010 1:53 am

The glossary in my text book says the kingdom Plantae is "a multicellular, photosynthetic eukaryote, etc....."
but I heard about parasitic "plants" that are chemoheterotrophs. So why are these classified as plants if they aren't photosynthetic?
Jules19
Garter
Garter
 
Posts: 15
Joined: Tue Oct 06, 2009 7:25 pm

Postby JackBean » Mon Jan 18, 2010 7:34 am

because that is acquired, but originally they were photosynthetis. That's like if you asked, why to say, that dolphins are mammals, when they live in water? Why not say, they are fishes?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
User avatar
JackBean
Inland Taipan
Inland Taipan
 
Posts: 5692
Joined: Mon Sep 14, 2009 7:12 pm

Postby biohazard » Mon Jan 18, 2010 7:43 am

As far as I know, photosynthesis is not the main criteria for an organism to be classified a plant despite it being perhaps the most prominent feature of plants. Plants are classified by a combination of several biochemical features, such as typical metabolic pathways, genes for clorophyl(?) and the composition of the cell wall etc. Also, I think even such parasitic plants that have no visible clorophyl still have the genes needed for its production (and most can under some conditions produce little of it).

I'm not 100% certain of this, though. Let's see if someone else knows more.
User avatar
biohazard
King Cobra
King Cobra
 
Posts: 776
Joined: Sun Apr 08, 2007 6:45 pm


Re: chemoheterotrophic plants

Postby JackBean » Mon Jan 18, 2010 7:52 am

Interesting question :o))

http://apps.isiknowledge.com/full_record.do?product=WOS&search_mode=Refine&qid=3&SID=U2P4eCMFn@75LKc1Olo&page=1&doc=1
(Vidal-Russell R and Nickrent DL (2008) The first mistletoes: Origins of aerial parasitism in Santalales)
They apparently do have chloroplasts
DNA sequences from nuclear SSU and LSU rDNA, and chloroplast rbcL, matK and trnL-F from 39 santalalean taxa were obtained.

But anyway, the genes for Chl biosynthesis do not have to be coded by the chloroplast DNA, but never mind :o))
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
User avatar
JackBean
Inland Taipan
Inland Taipan
 
Posts: 5692
Joined: Mon Sep 14, 2009 7:12 pm


Return to Botany Discussion

Who is online

Users browsing this forum: No registered users and 2 guests