【新闻：自然天气引起温室气体含量螺旋上升】Quirin Schiermeier. Wild weather can send greenhouse gases spiralling. Nature 496 147 (11 April 2013) doi:10.1038-496147a.
Abstract
Climate change has a disconcerting tendency to amplify itself through feedback effects. Melting sea ice exposes dark water allowing the ocean to soak up more heat. Arctic warming speeds the release of carbon dioxide from permafrost. And as researchers discussed at a meeting last week in Seefeld Austria climate extremes — heatwaves droughts and storms — can hamper plant growth weakening a major buffer against the rise of CO2 in the atmosphere....
【干旱胁迫与植物钾传输】Yuriko Osakabe Naoko Arinaga Taishi Umezawa Shogo Katsura Keita Nagamachi Hidenori Tanaka Haruka Ohiraki Kohji Yamada So-Uk Seo Mitsuru Abo Etsuro Yoshimura Kazuo Shinozaki and Kazuko Yamaguchi-Shinozaki. Osmotic Stress Responses and Plant Growth Controlled by Potassium Transporters inArabidopsis. The Plant Cell February 2013 vol. 25 no. 2 609-624
Abstract
Osmotic adjustment plays a fundamental role in water stress responses and growth in plants; however the molecular mechanisms governing this process are not fully understood. Here we demonstrated that the KUP potassium transporter family plays important roles in this process under the control of abscisic acid (ABA) and auxin. We generated Arabidopsis thaliana multiple mutants for K+ uptake transporter 6 (KUP6) KUP8 KUP2-SHORT HYPOCOTYL3 and an ABA-responsive potassium efflux channel guard cell outward rectifying K+ channel (GORK). The triple mutants kup268 and kup68 gork exhibited enhanced cell expansion suggesting that these KUPs negatively regulate turgor-dependent growth. Potassium uptake experiments using 86radioactive rubidium ion (86Rb+) in the mutants indicated that these KUPs might be involved in potassium efflux in Arabidopsis roots. The mutants showed increased auxin responses and decreased sensitivity to an auxin inhibitor (1-N-naphthylphthalamic acid) and ABA in lateral root growth. During water deficit stress kup68 gork impaired ABA-mediated stomatal closing and kup268 and