{"id":1599,"date":"2020-02-15T13:56:34","date_gmt":"2020-02-15T05:56:34","guid":{"rendered":"http:\/\/www.bioactivescreeninglibrary.com\/?p=1599"},"modified":"2022-01-07T10:56:17","modified_gmt":"2022-01-07T02:56:17","slug":"repeatedly-interactions-coincided-o22-bursts-increase-sod-activity","status":"publish","type":"post","link":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/2020\/02\/15\/repeatedly-interactions-coincided-o22-bursts-increase-sod-activity\/","title":{"rendered":"Repeatedly described as one of interactions coincided with O22 bursts and an increase in SOD activity"},"content":{"rendered":"

These data suggest that the control of ROS production is crucial for mycorrhizal stablishment, as an excessive level of ROS can result in cell damage involving lipid peroxidation of cell membranes. Besides, the spread of mycelium occurs only in the root cortex, this suggesting that the host plant exerts some kind of control over fungal proliferation, confining it into specific root tissues. Defense reactions, however, which are usually triggered as a plant response to microbial invasion, are only observed in a modulated form in AM tissues. In fact, these reactions occasionally result in a local, weak and transient defense response during the early steps of compatible AM interactions. Host plants usually show a cytological reaction to hyphopodia formation or to the first steps of root colonization, this attenuated response disappearing at the late stage of symbioses. Likewise, in onion plants cell wall binding chitinases and peroxidases activity increases during the first steps of AM colonization, reaching the lowest levels at the very early stages of symbioses. Symilarly, in tomato roots colonized by the mycorrhizal fungus Rhizophagus irregularis, POXs are induced at the begining but suppressed later. Recent studies also show the involvement of NO in the initial establishment of mycorrhiza. Calcagno et al. demostrated the rapid NO accumulation in Medicago truncata roots innoculated with the exudate from Gigaspora margarita spore cell walls. However, the relationship between ROS and NO during the early stages of in vivo interaction still remain unclear. Other elements of the plant defense response have been described for mycorrhizal roots. For instance, the phenylpropanoid metabolism is activated in typical AM interactions, but to a much lower degree than in plant-pathogen interaction. Likewise, AM-specific alterations in the pattern of anti-oxidative enzymes have been reported, matching to the appearance of ROS in arbusculated root cortical cells. Jasmonic acid and its derivative methyl ester methyljasmonate are considered to be an integral part of signal transduction pathways in plant defence responses; so, exogenously applied JA and MeJA were involved in both intra- and interplant signalling, and mimicked the effects of elicitors. Sunflower and olive seedling roots induced by MeJA showed significant enhancement in O22 generation and POX activity, both inhibited by DPI and Ca2+ blockers. Also, the H+ and K + fluxes were depressed and transitorily reverted by MeJA. Then, MeJA induces redox defense activities that can be taken as a model to be compared with the same induced by other factors. Verticillium dahliae has been choosen in our experiments as this is a well know pathogenic fungus causing the “Verticillium wilt” due to the infection of the vascular tissue in many species, olive trees included. The fungus is very persistent in the infected field, as it colonizes other plants acting as reservoirs, and also Bortezomib Proteasome inhibitor<\/a> because it develops resistant structures capable of surviving for decads in the soil. Considerable losses in productivity are caused by the pathogen that attack to all the olive varieties tested.<\/p>\n","protected":false},"excerpt":{"rendered":"

These data suggest that the control of ROS production is crucial for mycorrhizal stablishment, as an excessive level of ROS can result in cell damage involving lipid peroxidation of cell membranes. Besides, the spread of mycelium occurs only in the root cortex, this suggesting that the host plant exerts some kind of control over fungal … Continue reading “Repeatedly described as one of interactions coincided with O22 bursts and an increase in SOD activity”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/posts\/1599"}],"collection":[{"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/comments?post=1599"}],"version-history":[{"count":1,"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/posts\/1599\/revisions"}],"predecessor-version":[{"id":1600,"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/posts\/1599\/revisions\/1600"}],"wp:attachment":[{"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/media?parent=1599"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/categories?post=1599"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/tags?post=1599"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}