Abstract
The subcellular changes which occurred in sorghum leaves during increasing water stress and subsequent rewatering are described. Stomata were closed, abscisic acid levels were elevated, and the amounts of starch in the bundle sheath chloroplasts were much reduced by - 14 bars leaf water potential. Swelling of the outer chloroplast membrane, and reorganization of the tonoplast to form small vesicles from the large central vacuole, occurred by a leaf water potential of - 37 bars. Complete structural disruption of the tonoplast, as previously described for maize was not found. On rewatering, large amounts of starch reappeared within three hours. These findings strengthen the hypothesis that maintenance of tonoplast integrity is an important factor in the ability of plants to withstand drought.
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- Beardsell M. F., Cohen D. Relationships between Leaf Water Status, Abscisic Acid Levels, and Stomatal Resistance in Maize and Sorghum. Plant Physiol. 1975 Aug;56(2):207–212. doi: 10.1104/pp.56.2.207. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Giles K. L., Beardsell M. F., Cohen D. Cellular and ultrastructural changes in mesophyll and bundle sheath cells of maize in response to water stress. Plant Physiol. 1974 Aug;54(2):208–212. doi: 10.1104/pp.54.2.208. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kanemasu E. T., Thurtell G. W., Tanner C. B. Design calibration and field use of a stomatal diffusion porometer. Plant Physiol. 1969 Jun;44(6):881–885. doi: 10.1104/pp.44.6.881. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sanchez-Diaz M. F., Kramer P. J. Behavior of Corn and Sorghum under Water Stress and during Recovery. Plant Physiol. 1971 Nov;48(5):613–616. doi: 10.1104/pp.48.5.613. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Turner N. C. Stomatal Behavior and Water Status of Maize, Sorghum, and Tobacco under Field Conditions: II. At Low Soil Water Potential. Plant Physiol. 1974 Mar;53(3):360–365. doi: 10.1104/pp.53.3.360. [DOI] [PMC free article] [PubMed] [Google Scholar]