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Efficient Micropropagation of Chestnut Hybrids(Castanea spp.)Using Modified Woody Plant Medium and zeatin riboside

Horticultural Plant Journal 2021年第2期7卷 174-180页

作者： Guoqing Song Qiuxia Chen Pete Callow Mario Mandujano Xiaoyan Han Beatriz Cuenca Gregory Bonito Carmen Medina-Mora Dennis Wayne Fulbright Daniel EGuyer Plant Biotechnology Resource and Outreach Center Department of HorticultureMichigan State UniversityEast LansingMI 48824United States Department of Plant Soil and Microbial SciencesMichigan State UniversityEast LansingMI 48824United States Beijing Botanical Garden Institute of BotanyChinese Academy of SciencesBeijing 100093China TRAGSA Vivero de OurenseCtra.Maceda-Valdrey km 232700 MacedaOurenseSpain Department of Biosystems&Agricultural Engineering Michigan State UniversityEast LansingMI 48824United States

The chestnuts genus(Castanea spp.)is comprised of economically important trees native to the Northern hemisphere that are used as food and hardwood ***,a very efficient method for micropropagation of European×Japanese chestnut hybrids(Castanea sativa×***)is *** Plant Medium was used as the basal *** vitro shoots of four rootstock cultivars were micropropagated without shoot-tip necrosis on multiplication medium containing 5.7 or 11.4μmol·L^(−1)zeatin riboside,and were rooted on rooting medium containing 2.46μmol·L^(−1)indolebutyric *** shootmultiplication rates for each cultivarwere 2–5 *** vitro rooting percentages for four cultivars were 87%for‘Maraval’,67%for‘Marigoule’,93%for‘Marsol’,and 97%for‘Précoce Migoule’.Within a 5 week period,80%–95%of rooted shoots were successfully acclimated under high humidity conditions after they were planted in either soil or rockwool.

关键词： Castanea spp. micropropagation shoot multiplication rooting tissue culture zeatin riboside acclimation

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The plant hormone zeatin riboside inhibits T lymphocyte activity via adenosine A2A receptor activation

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Cellular & Molecular Immunology 2015年第1期12卷 107-112页

作者： Courtney M Lappas Department of Biology Lebanon Valley College Annville PA USA

Cytokinins are plant hormones that play an integral role in multiple aspects of plant growth and development. The biological functions of cytokinins in mammalian systems are, however, largely uncharacterized. The naturally occurring cytokinin zeatin riboside has recently been demonstrated to activate the mammalian adenosine A2A receptor, which is broadly expressed by various cell types including immune system cells, with the activation of the A2AR playing a role in the regulation of cells involved in both innate and adaptive immunity. We show for the first time that zeatin riboside modulates mammalian immune system activity via an A2AR-dependent mechanism. Specifically, zeatin riboside treatment induces the production of cyclic adenosine monophosphate （cAMP） by T lymphocytes and inhibits the production by CD3^＋CD4^＋ T cells of interferon （IFN）-γ, IL-2, tumor-necrosis factor （TNF）-α, IL-4 and IL-13, and the production by CD3^＋CD8^＋ T cells of IFN-γ, IL-2 and TNF-α. Additionally, the upregulation of CD25, CD69 and CD40L by activated T lymphocytes is modulated by zeatin riboside. zeatin riboside treatment also potently inhibits thioglycollate-induced peritoneal leukocytosis. The immunomodulatory activities of zeatin riboside are blocked by co-treatment with the selective A2AR antagonist ZM241385. These data suggest that zeatin riboside possesses therapeutic potential as a mammalian immunomodulatory agent.

关键词： adenosine A2A receptors T lymphocytes zeatin riboside

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