Essay Field Observation Of Drought Resistance

1872 Words Nov 20th, 2016 8 Pages
In other multi –species studies, however, no result it’s from pressure volume measurements correlated well to field observation of drought resistance (Bannister 1986; Bannister and Kissel 1986; Abrams et al 1990), or even to minimal water potentials (Davis and Mooney 1986, a, b). A variety of contrasting, compensating physiological changes may occur as water is lost; e.g., open stomata allow water potential to decline while photosynthesis continues, or closed stomata prevent both low and photosynthesis (Bannister and Kissel 1986; Schulz et al 1987; Guehl et al 1991).
The basal water potential as predawn is an important, useful measurement of plant water status (Hinckley et al 1978; Murphy and Ferrell, 1982; Waring and Schlensinger 1985; Davis and Mooney 1968a; Pallardy et al 1991), indicating how the plant integrates soil water availability and the level of the moisture at which it begins to develop its daily water deficit. Evergreen leaves may require special care to provide accurate data (Abrams and Menges 1992). The degree of tissue rehydration before pressure-volume measurement modifies results (Abrams 1988 1990; Abrams and Menges 1992) although interpretations and species differ (Gross and Koch 1991; Schulte and Henry 1992). However , some strong correlation of these values with turgor maintenance suggest that we measure, and elasticity.
The influence of water availability if plants performance in natural and managed ecosystem has been the subject of a large body of…

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