After a plant has experienced some kind of adversity, it can improve its resistance to another kind of adversity. This mutual tolerance between bad environments is called cross-tolerance. For example, UV treatment of tobacco increases tolerance to mosaic virus, and ozone treatment of Arabidopsis causes resistance to Pseudomonas syringae virus. In these studies, induced cross-tolerance was primarily produced by ROS, associated with rapid release of H 2 O 2 during oxidative bursts, and with plants for non-toxic pathogen responses. ROS may act as a messenger to activate the expression of defense genes, but the role of Ca 2+ signaling during this process is unclear.
In February 2011, Australia's Shabala et al. reported the cross-tolerance of plant oxidative stress gain, and studied how the activity of the Ca 2+ transport system regulates this phenomenon. Tobacco was infected with Potato virus X (PVX), exposed to oxidative (UV-C or H 2 O 2 ) stress, and the Ca 2+ and K + flow rates were determined by non-damage micro-measurement (MIFE). Pharmacological and cytological methods have studied the adaptive response of plants as a whole, and found that plants can better cope with UV and H 2 O 2 after virus infection, and prevent damage to chloroplast structure and function. Ca 2+ flow is an early response of plants to pathogen invasion. Ca 2+ transport and ROS may be the key to controlling cell tolerance at the cellular level.
This study demonstrates a high degree of crossover between UV and pathogen-induced oxidative stress, and an important role in the Ca 2+ efflux system in plant tolerance to oxidative stress, re-producing that the virus may be beneficial for plant resistance Controversy. In Daejeon, different stresses are common, and increasing stress and tolerance may have important implications for the development of agriculture.
Key words: non-invasive micro-test technique (MIFE), Ca2+/H+ exchanger, Ca2+ pump, chloroplast, mesophyll, potato virus X (PVX), UV irradiation
Full-text reading: Plasma membrane Ca2+ transporters regulate viral -induced resistance to oxidative stress Plasma membrane Ca2+ transportersmediate virus-induced acquired resistance to oxidative stress
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