Víst er, að landplöntur eru komnar af þörungum, sem lifa í sjó og ferskvatni. Mönnum hefur þó löngum verið ráðgáta, hvernig plönturnar „skriðu“ á land. Vitað er, að þörunga skortir mörg gen, sem hljóta að hafa verið vefplöntum nauðsynleg.
Nú er hins vegar margt, sem bendir til þess, að þessi gen séu komin úr svepparíkinu. Áður en vefplöntur urðu til hafa fléttur, sem eru myndaðar af sambýli þörunga og sveppa , náð að vaxa á þurru landi. Fyrstu landplöntur höfðu vitaskuld engar rætur og jarðvegur var lítill sem enginn. Sennilegt má telja, að í sambýli við sveppi hafi þeim tekizt að ná til sín nægilegu magni ólífrænna efna (steinefna), enda geta sveppþræðir losað um steinefni úr hörðu bergi. Enn lifa margar vefplöntur í sambýli við sveppi (sbr. svepprót).
Ætla má, að mörg efni önnur séu komin úr svepparíkinu við það, að gen hafi hoppað yfir í plöntur. Þar má nefna gen sem ráða litarefni í blómum, lígnín-gen til að auka styrk, gen til að verjast útfjólubláu ljósi og árás skordýra. Engin slík gen er að finna í þörungum, en þau eru hins vegar til meðal sveppa..
ÁHB / 23. okt. 2013
Hey there! I know this is kinda off topic but I was wondering which blog platform are you using for this website? I’m getting fed up of Wordpress because I’ve had issues with hackers and I’m looking at options for another platform. I would be fantastic if you could point me in the direction of a good platform.
I like what you guys are up also. Such smart work and reporting! Keep up the superb works guys I?¦ve incorporated you guys to my blogroll. I think it’ll improve the value of my web site 🙂
It’s arduous to find educated folks on this matter, but you sound like you recognize what you’re talking about! Thanks
The other day, while I was at work, my cousin stole my iPad and tested to see if it can survive a 30 foot drop, just so she can be a youtube sensation. My iPad is now broken and she has 83 views. I know this is totally off topic but I had to share it with someone!
Hello. splendid job. I did not imagine this. This is a fantastic story. Thanks!
I’m not that much of a internet reader to be honest but your blogs really nice, keep it up! I’ll go ahead and bookmark your site to come back down the road. Many thanks
I have recently started a web site, the info you offer on this web site has helped me greatly. Thanks for all of your time & work.
I¦ve recently started a web site, the info you provide on this website has helped me tremendously. Thank you for all of your time & work.
It’s arduous to seek out educated individuals on this matter, however you sound like you already know what you’re talking about! Thanks
It’s appropriate time to make some plans for the future and it is time to be happy. I’ve read this post and if I could I want to suggest you few interesting things or advice. Perhaps you could write next articles referring to this article. I want to read more things about it!
I don’t commonly comment but I gotta say thankyou for the post on this one : D.
Thanks for your marvelous posting! I really enjoyed reading it, you might be a great author.I will ensure that I bookmark your blog and definitely will come back very soon. I want to encourage you to definitely continue your great posts, have a nice holiday weekend!
Lovely just what I was searching for.Thanks to the author for taking his clock time on this one.
Can I just say what a relief to find someone who actually knows what theyre talking about on the internet. You definitely know how to bring an issue to light and make it important. More people need to read this and understand this side of the story. I cant believe youre not more popular because you definitely have the gift.
I truly appreciate this post. I have been looking all over for this! Thank goodness I found it on Bing. You have made my day! Thanks again!
You have remarked very interesting details! ps nice site.
zeus gratis hello my website is game rolet
slot777 online hello my website is Changes Lauv
video tete hello my website is One88 Me
laici slot hello my website is bebek versi
dewa rezeki hello my website is slot4d win
tecca login hello my website is formula data
withdrawal hello my website is mon boy
introhd hello my website is megasloto slot
| panen hello my website is DMDM Hydantoin