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Title: The soil:plant:atmosphere system : a study of plant water relations
Author: Macklon, Alan Edward Stephen
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1962
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Equipment, already constructed, was further improved to provide precise control of temperature, humidity, wind speed and light intenalty, in the investigation of the relative effects of various levels of soil and atmospheric moisture content on the water relations of ricinus comminic plants. For this work, techniques were developed for measuring the water status of the leaf, etomatal aperture, transpivation and total soil moisture stress. It was shown that even extreme levels of atmospheric drought do not adversely affected the plant when water 10 freely available to the roots. Due to undesirable effects of polyethylons glycol on root permeability when using this solute to control water availability, attempts to assess the importance of different levels of atmospheric drought when water supply to the roots was restricted in this way wore of only limited success. Further work was therefore carried out on plants grown in soil. Investigations with potted plante showed how atmospheric drought can become important to the plant, when soil water is depleted. Finally, work carried out with planton grown in larger masses of soil demonstrated the importance of soil water transolon characteristica in determining both the extent to which atmospheric drought is deleterious to the plant, and the extent and speed of water deficit recovery. The implications of these results are discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available