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Root nodule response to drought stress is influenced by systemic or local signal ?

Root nodule response to drought stress is influenced by systemic or local signal ?. Split-root system, SRS compare droughted and watered nodules on the same plants. Different drought treats. C: ck PD: partial drought PD-C: the irrigated part PD-D: the nonirrigated part

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Root nodule response to drought stress is influenced by systemic or local signal ?

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  1. Root nodule response to drought stress is influenced bysystemicorlocal signal ?

  2. Split-root system, SRScompare droughted and watered nodules on the same plants

  3. Different drought treats C: ck PD: partial drought PD-C: the irrigated part PD-D: the nonirrigated part D: total drought

  4. Effect of partial and total drought on evapotranspirationand water potentialin leaves and nodule

  5. 4 7 7

  6. Effect of partial and total drought on nitrogen fixationnodule protein content,apparent nitrogenase activity(ANA)nodule functioning

  7. C: 59.25 PD-C: 58.72 PD-D: 44.62 D: 39.21 Nodule protein content

  8. 7

  9. Drought stress exerts a local rather than a systemic control

  10. Effect of partial and total drought on sucrose synthase and isocitrate dehydrogenase activity and gene expression

  11. D-stressed plants SS RNA levels ICDH gene expression enzyme activity enzyme activity Day 7

  12. Malate, the main carbon substrate for bacteroid’s (類菌體) respiration and nitrogen fixation activity SS activity malate

  13. Local control could be expressed through decreased carbon metabolism • Nitrogen fixation may be regulated under D by carbon supply to the bacteroid

  14. Post-transcriptional regulation ICDH under D stress is to regenerate the NADPH pool , an essential component of antioxidant defense systems

  15. PD induces a local redox imbalance in nodules drought effects on nodule metabolism can be mimicked by methyl viologen (氧化還原指示劑) exacerbate the generation of reactive oxygen species (ROS)

  16. Ascorbate (ASC)為Ascorbate peroxidase的反應受質 Dehydroascorbate (DHA) Ascorbate DHA reductase

  17. Catalase (CAT) – H2O2 H2O

  18. local control of nitrogen fixation activity under D stress could be the overproduction of ROS • a redox imbalance occurred in PD-D nodules, but not in PD-C ones, suggesting a localized control

  19. this study provides evidence for a local signal for reduced N2 fixation under D • further studies are required to determine if nitrogen compounds are involved in this signaling

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