Zinc Requirement for Stomatal Opening in Cauliflower

This study indicates an involvement of Zn in stomatal opening, possibly as a constituent of the enzyme CA and/or as a factor in maintaining membrane integrity and K+ uptake

P. N. Sharma


Scholarcy highlights

  • Zn deficiency induced increases in epicuticular wax deposits, lamina thickness, degree of succulence, water saturation deficit, diffusive resistance, and proline accumulation and decreases in carbonic anhydraseactivity, water potential, stomatal aperture, and transpiration in the leaves of cauliflower plants
  • Previous studies have shown that Zn deficiency stress decreased ij, stomatal aperture, and E and increased WSD in cabbage and cauliflower
  • Apart from malate accumulation, H+-ATPase pumpdriven influx of K+ from the apoplast, in exchange for H+, is suggested to form the osmoticum required for stomatal opening.According to Schnabl,increased concentration of K+ serves to activate PEP carboxylase in the guard cell protoplasts
  • The present study was carried out to assess the extent to which decreased stomatal opening and E in Zn-deficient plants could be attributed to the decreases in $ and CA activity, the effect of Zn deficiency on accumulation of K+ in the guard cells, and stomatal responses in intact leaves to resupply of Zn through the roots, and in isolated epidermal peels to resupply of Zn through the ambient solution
  • Water stress in the Zn-deficient plants was indicated by decreases in JI and E and increases in WSD and DR (Table
  • The resupply of Zn enhanced the stomatal aperture even in the Zn-sufficient epidermal peels, probably by stimulating solute accumulation in the guard cells that become depleted of their osmotica when floated on distilled water
  • Iā€™inton R, Cakmak I, Marschner H Zinc deficiency enhanced NAD(P)H-dependent superoxide radical production in plasma membrane vesicles isolated from roots of bean plants

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