Root Physics and Disarticulated Anubias Roots

From: ted.held at us.henkel.com (ted.held at us.henkel.com) on 2008.06.10 at 12:13:32(17826) Jan's pictures were most interesting. It did look as though the roots had been cooler than the surrounding root-free plastic, causing condensation along the root length. I suggest, however, that this is caused by the difference in mass between the roots plus plastic versus the plastic sheeting alone. That is, the thin sheet of plastic gets warmer faster because it has less mass. This creates, in effect, a cooler temperature under the roots, leading to preferential condensation. Another effect that may play here is that the underside of the root is in shade, also keeping it cooler or slowing its warming in the sunlight. On the subject of root disarticulation, I have seen this with Anubias species, which have a good grip on the substrate, perhaps due to the same mechanisms that Peter is describing. But I have never seen a fragment of disarticulated root regenerate into a new plant. I have, from time to time, inadvertently created fairly long pieces of isolated Anubias root. They seemingly survive for months, but eventually give it up without organizing a new growth point for leaves or green stems. Has anyone on the list had them regenerate? +More -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.gizmoworks.com/mailman/private/aroid-l/attachments/20080610/005a5f24/attachment-0001.htm

From: botanist at malesiana.com (Peter Boyce) on 2008.06.11 at 21:23:16(17833) Hi, The disarticulation I posted concerned shoots tips, not root tips. The shoot tips of rheophytic Asian Schismatoglottideae are capable of breaking off in spate streams and often lodge further downstream and reestablish while the stump and root system that remains regenrates. Pete +More ----- Original Message ----- From: ted.held at us.henkel.com To: Discussion of aroids Sent: Tuesday, June 10, 2008 8:13 PM Subject: [Aroid-l] Root Physics and Disarticulated Anubias Roots Jan's pictures were most interesting. It did look as though the roots had been cooler than the surrounding root-free plastic, causing condensation along the root length. I suggest, however, that this is caused by the difference in mass between the roots plus plastic versus the plastic sheeting alone. That is, the thin sheet of plastic gets warmer faster because it has less mass. This creates, in effect, a cooler temperature under the roots, leading to preferential condensation. Another effect that may play here is that the underside of the root is in shade, also keeping it cooler or slowing its warming in the sunlight. On the subject of root disarticulation, I have seen this with Anubias species, which have a good grip on the substrate, perhaps due to the same mechanisms that Peter is describing. But I have never seen a fragment of disarticulated root regenerate into a new plant. I have, from time to time, inadvertently created fairly long pieces of isolated Anubias root. They seemingly survive for months, but eventually give it up without organizing a new growth point for leaves or green stems. Has anyone on the list had them regenerate? ------------------------------------------------------------------------------ _______________________________________________ Aroid-L mailing list Aroid-L at www.gizmoworks.com http://www.gizmoworks.com/mailman/listinfo/aroid-l -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.gizmoworks.com/mailman/private/aroid-l/attachments/20080612/d5466a43/attachment.htm

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