Abstract
Numerous studies have associated increased stomatal resistance with response to water deficit in cereals. However, consideration of change in leaf form seems to have been neglected. The response of adaxial and abaxial stomatal resistance and leaf rolling in rice to decreasing leaf water potential was investigated. Two rice cultivars were subjected to control and water stress treatments in a deep (1-meter) aerobic soil. Concurrent measurements of leaf water potential, stomatal resistance, and degree of leaf rolling were made through a 29-day period after cessation of irrigation. Kinandang Patong, an upland adapted cultivar, maintained higher dawn and midday leaf water potential than IR28, a hybrid selected in irrigated conditions. This was not explained by differences in leaf diffusive resistance or leaf rolling, and is assumed to result from a difference in root system extent.
Stomatal resistance increased more on the abaxial than the adaxial leaf surface in both cultivars. This was associated with a change in leaf form or rolling inward of the upper leaf surface. Both responses, increased stomatal resistance and leaf rolling, were initiated in a similar leaf water potential range (−8 to −12 bars). Leaves of IR28 became fully rolled at leaf water potential of about −22 bars; however, total leaf diffusive resistance was only about 4 to 5 seconds per centimeter (conductance 0.25 to 0.2 centimeter per second) at that stage. Leaf diffusive resistance and degree of leaf rolling were linearly related to leaf water potential. Thus, leaf rolling in rice may be used as an estimate of the other two less obvious effects of water deficit.
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Selected References
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- Jordan W. R., Brown K. W., Thomas J. C. Leaf Age as a Determinant in Stomatal Control of Water Loss from Cotton during Water Stress. Plant Physiol. 1975 Nov;56(5):595–599. doi: 10.1104/pp.56.5.595. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Jordan W. R., Ritchie J. T. Influence of soil water stress on evaporation, root absorption, and internal water status of cotton. Plant Physiol. 1971 Dec;48(6):783–788. doi: 10.1104/pp.48.6.783. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kanemasu E. T., Tanner C. B. Stomatal diffusion resistance of snap beans. I. Influence of leaf-water potential. Plant Physiol. 1969 Nov;44(11):1547–1552. doi: 10.1104/pp.44.11.1547. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Scholander P. F., Bradstreet E. D., Hemmingsen E. A., Hammel H. T. Sap Pressure in Vascular Plants: Negative hydrostatic pressure can be measured in plants. Science. 1965 Apr 16;148(3668):339–346. doi: 10.1126/science.148.3668.339. [DOI] [PubMed] [Google Scholar]
- Sionit N., Kramer P. J. Water Potential and Stomatal Resistance of Sunflower and Soybean Subjected to Water Stress during Various Growth Stages. Plant Physiol. 1976 Oct;58(4):537–540. doi: 10.1104/pp.58.4.537. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Turner N. C., Begg J. E. Stomatal Behavior and Water Status of Maize, Sorghum, and Tobacco under Field Conditions: I. At High Soil Water Potential. Plant Physiol. 1973 Jan;51(1):31–36. doi: 10.1104/pp.51.1.31. [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]