nfoto Posted February 10, 2013 Share Posted February 10, 2013 Rørslett, B. 2013. Brassica rapa L. ssp. campestris (L.) A.R. Clapham (Brassicaceae). Wild Turnip. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...is-wild-turnip/ Brassica rapa L. ssp. campestris (L.) A.R. Clapham Syn. B. campestris L., B. rapa L. ssp. sylvestris (L.) Janch. (ssp. campestris), B. campestris L. var. oleifera DC. (ssp. oleifera), B. campestris L. ssp. rapifera (Metzg.) Sinskaya, B. rapa L. ssp. rapifera Metzg. (ssp. rapa) NO: Åkerkål (ssp. campestris); ryps (ssp. oleifera); nepe, turnips (ssp. rapa) SE: Åkerkål;rybs, ryps (ssp. oleifera); rova (ssp. rapa) DK: Ager-Kål (ssp. campestris), Rybs (ssp. oleifera) FI: Peltokaali (ssp. campestris); Rypsi (ssp. oleifera); Nauris, Turnipsi (ssp. rapa) IS: Akurkál (ssp. campestris); Næpur (ssp. rapa) DE: Rübsen EN: Wild Turnip; Field Mustard (ssp. campestris);Turnip-rape (ssp. oleifera); Turnip (ssp. rapa) This complex comprises a bewildering range of cultivated and wild races, to which almost every possible combinations of botanical names and authorities have been applied over time. The collective species is native to Europe and adjacent regions of Asia. Specimens (ssp. campestris) collected outside Oslo, Norway 1 Jul 2008. Image reference: BRAS_CAM_I0807017897_VIS.jpg Visible light. Nikon D200, Coastal Optics 60 mm f/4 APO lens, Baader UV/IR block filter, daylight. Image reference: BRAS_CAM_I0807017899_UV.jpg Ultraviolet light. Nikon D200, Coastal Optics 60 mm f/4 APO lens, Baader U 2" (Venus) filter, SB-140 flash. The UV rendition is remarkable as the petals are different on their upper and lower sides, the latter being much more UV reflective than the adaxial surface. Even more surprising as the buds (seen in the background) do not show the same pattern. [Published 10 Feb 2013] Link to comment
msubees Posted March 23, 2015 Share Posted March 23, 2015 Interesting. I have seen one (I thought it was the same species, but I am not sure. It was planted as a Chinese cabbage in my garden). but it had a dark center and yellow outside, much as a black-eyed susan. Link to comment
nfoto Posted March 23, 2015 Author Share Posted March 23, 2015 The various Brassica species are extensively cultivated and interbred. Thus their UV signature apparently ranges all over the place. Link to comment
Andrea B. Posted March 24, 2015 Share Posted March 24, 2015 When the Brassicas are cultivated there are lots of crossing and hybrids, of course. It has also been noted (somewhere?) that garden plants are sometimes misnamed. So far, I think, the wild varieties have shown stable UV signatures. Link to comment
nfoto Posted March 24, 2015 Author Share Posted March 24, 2015 To the extent that 'unpolluted' wild varieties can be found, perhaps. Link to comment
Andrea B. Posted March 24, 2015 Share Posted March 24, 2015 If we didn't assume some stability for most wild species, all keys would fly away into the ozone. :DThere are notorious exceptions - Burdock comes to mind. Link to comment
nfoto Posted March 24, 2015 Author Share Posted March 24, 2015 You misunderstand my meaning, Andrea. We are talking about the original genotypes for taxa later being exploited and developed for human use. These 'native' races can easily become genetically polluted. That is not to say such pollution and interbreeding by necessity occur. A case is the native carrot Daucus carota (Apiaceae), native to southernmost Norway, where the wild form is markedly different from the cultural races and I have never seen any signs of inbreeding there, although carrot cultivation is widespread in the same districts. Link to comment
Andrea B. Posted March 24, 2015 Share Posted March 24, 2015 Yes that is clearly understood. I did not misunderstand you! But when you said this: To the extent that 'unpolluted' wild varieties can be found, perhaps.I then responded with a comment about assuming as best we can that the wild varieties remain unpolluted. Except for Burdock. Link to comment
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