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Path: ...!news.mixmin.net!weretis.net!feeder8.news.weretis.net!newsfeed.xs3.de!nntp-feed.chiark.greenend.org.uk!ewrotcd!news.eyrie.org!beagle.ediacara.org!.POSTED.beagle.ediacara.org!not-for-mail From: Arkalen <arkalen@proton.me> Newsgroups: talk.origins Subject: Re: Primary endosymbiosis caught in the act Date: Thu, 18 Apr 2024 20:21:56 +0200 Organization: A noiseless patient Spider Lines: 28 Sender: to%beagle.ediacara.org Approved: moderator@beagle.ediacara.org Message-ID: <uvroc5$2d43k$1@dont-email.me> References: <uvrjq4$2c3kt$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Info: beagle.ediacara.org; posting-host="beagle.ediacara.org:3.132.105.89"; logging-data="41663"; mail-complaints-to="usenet@beagle.ediacara.org" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 To: talk-origins@moderators.isc.org Cancel-Lock: sha1:bUPSsOvey3IZu0JP2rg+fFUQRZ0= Return-Path: <news@eternal-september.org> X-Original-To: talk-origins@ediacara.org Delivered-To: talk-origins@ediacara.org id 088E822976C; Thu, 18 Apr 2024 14:21:55 -0400 (EDT) by beagle.ediacara.org (Postfix) with ESMTPS id C9C55229758 for <talk-origins@ediacara.org>; Thu, 18 Apr 2024 14:21:52 -0400 (EDT) by moderators.individual.net (Exim 4.97) for talk-origins@moderators.isc.org with esmtps (TLS1.3) tls TLS_AES_256_GCM_SHA384 (envelope-from <news@eternal-september.org>) id 1rxWOf-00000002e63-1qgf; Thu, 18 Apr 2024 20:22:09 +0200 id D270DDC01CC; Thu, 18 Apr 2024 20:21:58 +0200 (CEST) X-Injection-Date: Thu, 18 Apr 2024 20:21:57 +0200 (CEST) Content-Language: en-US X-Auth-Sender: U2FsdGVkX18ZT7O8iKoz7JC0bLazxPez/7Z/zA5+OBY= In-Reply-To: <uvrjq4$2c3kt$1@dont-email.me> Bytes: 3339 On 18/04/2024 19:04, Chris Thompson wrote: > Is it true that primary endosymbiosis is thought to have happened only > twice? I'm a little dubious about that. But this is still cool. > > "Scientists have caught a once-in-a-billion-years evolutionary event in > progress, as two lifeforms have merged into one organism that boasts > abilities its peers would envy. Last time this happened, Earth got plants." > > > https://newatlas.com/biology/life-merger-evolution-symbiosis-organelle/ > One bit I'd found interesting that I didn't know when this article (or another one about the same paper) was posted earlier was that apparently symbioses of plants with N2-fixing bacteria date back to the Cretaceous - both for algae and land plants even though they do it completely differently! I'm also dubious about it having happened twice, I thought plants had several plastids corresponding to more than one endosymbiotic event. But maybe they simplified things for effect, mitochondria and chloroplasts are the big ones everyone knows about. Of course (of course). Checking that famous drawing of the tree of life with different endosymbiosis events that I thought included several, it does seem to only have the mitochondria and chloroplast one after all: https://www.researchgate.net/figure/Schematic-Diagram-of-Symbiosis-in-the-Tree-of-Life-and-the-Union-of-the-Bacterial-and_fig1_332956942