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The objectives of this study were: 1) to compare drought responses between the more recently developed creeping bentgrass cultivars to standard cultivars and 2) to determine differential drought tolerance and avoidance characteristics associated with cultivar variation in drought resistance. Six cultivars of creeping bentgrass (Agrostis stoloniferia) ('Penn A-4', 'Independence', 'Declaration', 'L-93', 'Penncross', and 'Putter') were maintained in growth chambers at 20 8C day/15 8C night either well-watered or exposed to drought stress by withholding water for 17 days. Cultivars varied in turf performance and physiological responses (leaf relative water content and photochemical efficiency) to drought stress, which was reflected in their differences in drought tolerance (osmotic adjustment) and drought avoidance traits (water use rate and efficiency, root viability, root length, and number). 'Penn A-4,' 'Independence,' and 'L-93' generally performed better than other three cultivars under drought conditions, mainly through maintaining higher water use efficiency, root viability, root elongation, or root produc- tion. The majority of physiological parameters evaluated suggested that of the six creep- ing bentgrass cultivars examined in this study, the three cultivars with better ability to survive drought stress used mainly avoidance traits related to water use and water uptake.

Evaluation of Drought Tolerance and Avoidance Traits for Six Creeping Bentgrass Cultivars