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NaMYB8 regulates distinct,optimally distributed herbivore defense traits

Journal of Integrative Plant Biology 2017年第12期59卷 844-850页

作者： Martin Schafer Christoph Brutting Shuqing Xu Zhihao Ling anke steppuhn lan T.Baldwin Meredith C.Schuman Department of Molecular Ecology Max-Planck-Institute for Chemical EcologyHans-Knoll-Str.807745 JenaGermany Molecular Ecology Dahlem Centre of Plant Sciences(DCPS)Institute of BiologyFreie Universitat(FU)BerlinHaderslebener Str.912163 BerlinGermany

When herbivores attack, plants specifically reconfigure their metabolism. Herbivory on the wild tobacco Nicotiana attenuata strongly induces the R2R3 MYB transcriptional activator MYB8, which was reported to specifically regulate the accumulation of phenolamides （PAs）. We discovered that transcriptional regulation of trypsin protease inhibitors （TPIs） and a threonine deaminase （TD） also depend on MYB8 expression. Induced distributions of PAs, TD and TPIs all meet predictions of optimal defense theory： their leaf concentrations increase with the fitness value and the probability of attack of the tissue. Therefore, we suggest that these defensive compounds have evolved to be co-regulated by MYB8.

关键词： Figure TPI NaMYB8 regulates distinct,optimally distributed herbivore defense traits

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Effects of Nitrogen Sources on Nitrate Reductase Activity and Some Physiological Parameters in Psyllium （Plantago ovata F.） under Salinity Stress

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Journal of Agricultural Science and Technology 2011年第4期5卷 412-419页

作者： M. Heidaril, H. steppuhn F. Farzaneh Plant Breeding Faculty of Agronomy University of Zabol P.O. Box 98615-538 Iran Agriculture and Agri-Food Canada Swift Current Saskatchewan S9H 3X2 Canada Department of Plant Biology University of Golestan Golestan 49138-15739 Iran

The effects of three nitrogen sources (ammonium, nitrate and ammonium+nitrate) and three salt treatments (0, 100 and 200 mM NaCl) on nitrate reductase activity, proline, soluble protein and carbohydrate contents in psylliom (Plantago ovata) plants were studied. The nitrate reductase activity tended to increase when NO3 – was included in the root-zone solution, but decrease as salinity increased. All N sources stimulated plant growth and nutrient uptake. Shoot and root dry matter tended to decrease as salinity increased, but less so when both NH4 + and NO3 – were present. Shoot biomass accumulated to significantly greater quantities under the mixed-N treatments than when produced using either NH4 + or NO3 – N-form alone. Although not statistically significant, the root biomasses showed a similar tendency. Generally, leaf proline and soluble shoot carbohydrate contents increased with increasing salinity in contrast to soluble protein which decreased regardless of the N source. Under salinity conditions, the concentration of Na+ in shoot and root tissues was highest in ammonium-N treatment, while that of K+ was highest in the mixed-N treatment.

关键词：硝酸还原酶活性车前子盐胁迫生理参数氮源可溶性蛋白质碳水化合物含量可溶性糖含量

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在盐性培养基上生长的Canola、紫色豌豆、干菜豆和硬粒小麦间的比较

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国外作物育种 2002年第3期21卷 42-42页

作者： H.steppuhn 向平等

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