Cellular and Ultrastructural Changes in Mesophyll and Bundle Sheath Cells of Maize in Response to Water Stress.

  • Giles K
  • Beardsell M
  • Cohen D
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Ultrastructural changes were correlated with leaf water potential, relative water content, and abscisic acid levels in the leaf. Mesophyll cells were more prone to damage than bundle sheath cells at a leaf water potential of -18.5 bars. Tonoplast breakdown and cell disruption occurred in 25% of the mesophyll cells. On rewatering, these disrupted cells did not recover. In bundle sheath cells, starch, lost at about -13.5 bars leaf water potential, reappeared within 2.5 hours of rewatering.

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  • K L Giles

  • M F Beardsell

  • D Cohen

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