File:The sticky seed of juniper dwarf mistletoe (Arceuthobium oxycedri) from the Crimea.jpg
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[edit]DescriptionThe sticky seed of juniper dwarf mistletoe (Arceuthobium oxycedri) from the Crimea.jpg |
Українська: Липка насінина ялівцевої омели (Arceuthobium oxycedri (DC.) M. Bieb) з Кримського півострова ̶ напівпаразитичного виду, що обирає в якості господарів представників голарктичних Cupressaceae. В Криму паразитує на ялівці дельтовидному (Juniperus deltoides R.P. Adams), ялівці високому (J. excelsa M. Bieb.) та біоті східній (Platycladus orientalis (L.) Franco). З-поміж числених унікальних властивостей видів роду Arceuthobium слід зазначити балістичне поширення насіння шляхом катапультування внаслідок зростання гідростатичного тиску та термогенезу. Насінина A. oxycedri 0,9−1 мм завдовжки та ~0.4−0.5 мм завширшки, з видовженою квітконіжкою на проксимальному кінці. Насінини A. oxycedri вкриті шаром липкого вісцину (“пташиний клей”), який формує сніжно-білий чохлик. Після насичення водою вісцин утворює клейкі тяжі, які сприяють прикріпленню насінини до гілки рослини-господаря чи вектору орнітохорії. Зображення отримано за допомогою стереомікроскопу Axio Zoom.V16 (Carl Zeiss, Germany). Насіння зібрано на горі Малий Сокіл в околицях Судака, Автономна Республіка Крим, Україна.
English: The sticky seed of juniper dwarf mistletoe (Arceuthobium oxycedri (DC.) M. Bieb) from the Crimean Peninsula ̶ a semi-parasitic species of Holarctic Cupressaceae hosts parasitizing Eastern prickly juniper, Juniperus deltoides R.P. Adams, Greek juniper, J. excelsa M. Bieb. and Oriental thuja, Platycladus orientalis (L.) Franco. Among the unique features of Arceuthobium spp. are ballistic seed dispersal primarily achieved through a hydrostatically controlled explosive discharge mechanism and thermogenesis. Seeds of A. oxycedri are ~0.9−1 mm long and ~0.4−0.5 mm wide, with an elongated pedicel on the proximal (acuminate) apex. A. oxycedri seeds are covered by a sticky viscin (“birds glue”) forming a snow-white cap on the distal (roundish) apex and thin layer on the surface of the seed. After the hydration viscin forms sticky stands required for parasite attachment to the host branch and/or sporadic ornithochory. The picture was taken using stereomicroscope Axio Zoom.V16 (Carl Zeiss, Germany). Seeds are from Mt. Malyi Sokol, Sudak territory Autonomous Republic of Crimea, Ukraine. |
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Source | Own work |
Author | Yuliya Krasylenko |
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current | 20:23, 28 November 2017 | ![]() | 1,184 × 1,578 (254 KB) | Yuliya Krasylenko (talk | contribs) | User created page with UploadWizard |
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Date and time of data generation | 14:18, 22 September 2017 |
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Date and time of digitizing | 14:18, 22 September 2017 |
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