Moisture stress

Moisture stress occurs when the water in a plant's cells is reduced to less than normal levels. This can occur because of a lack of water in the plant's root zone, higher rates of transpiration than the rate of moisture uptake by the roots, for example, because of an inability to absorb water due to a high salt content in the soil water or loss of roots due to transplantation. Moisture stress is more strongly related to water potential than it is to water content.[1][2][3]

Moisture stress also has an effect on stomatal openings of a plant, mainly causing a closure in stomata as to reduce the amount of carbon dioxide assimilation.[4] Closing of the stomata also slows the rate of transpiration, which limits water loss and helps to prevent the wilting effects of moisture stress.[5] This closing can be trigged by the roots sensing dry soil and in response producing the hormone ABA which when transported up the xylem into the leaves will reduce stomatal conductance.[6]

See also

References

  1. ↑ "Plant Moisture Stress: Evaluation by Pressure Bomb -- Waring and Cleary 155 (3767): 1248 -- Science". www.sciencemag.org. Retrieved 2008-03-19.
  2. ↑ "ScienceDirect - Environmental Pollution : Predisposition of trees by air pollutants to low temperatures and moisture stress". www.sciencedirect.com. Retrieved 2008-03-19.
  3. ↑ "JSTOR: New Phytologist: Vol. 70, No. 6 (Nov., 1971), pp. 1061-1068". links.jstor.org. Retrieved 2008-03-19.
  4. ↑ pubmeddev. "Leaf Water Potential%2C Stomatal Resistance%2C and Photosynthetic Resp - PubMed - NCBI". www.ncbi.nlm.nih.gov. Retrieved 2016-03-03.
  5. ↑ Freeman, Scott (2014). Biological Science: Fifth Edition. USA: Pearson Education, Inc. p. 765. ISBN 978-0-321-74367-1.
  6. ↑ Lambers, Hans; Chapin II, F. Stuart; Pons, Thijs L. (2008). Plant physiological Ecology. New York, NY: Springer. p. 349. ISBN 978-0-387-78340-6.


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