Characterization of Whole-Plant Water Economy in Cotton Genotypes

Sixteen upland cotton genotypes were continuously monitored for whole-plant water use from first bloom to maturity; stomata density data was also collected. Two greenhouses were modified to serve as a rain shelter and a water stress regime was imposed at first bloom stage and maintained until maturity. Individual pots were suspended from electronic loadcells, Whole-plant water use was measured on an hourly basis by lysimetry and data logged automatically with a computerized system. The whole-plant water use throughout the season was related to the stomata density and compared among genotypes.