Krishna Katuwal Viktor Tishchenko, Ph.D. Our findings indicated a wide variation exists in drought tolerance in seashore paspalum, and the better-performing genotypes could be a source of drought-tolerance traits for improving turfgrass stress tolerance. In general, after a week of drought stress, better-performing genotypes had greater osmotic adjustment than poorer-performing genotypes. SeaIsle 1 also had greater cell membrane stability, as indicated by lower electrolyte leakage compared with many other genotypes. Leaf water-use efficiency of SeaIsle 1 was nine times greater than the average leaf water-use efficiency of SeaStar or PI614680. SeaIsle 1 also had greater photosynthesis, transpiration and stomatal conductance than poorer-performing genotypes. The genotype SeaIsle 1 performed well and had the greatest leaf water content of 54% at the end of stress treatment. Other genotypes had intermediate responses. Seashore paspalum genotypes such as SeaIsle 1 and PI647891 had the best drought performance, whereas SeaStar and PI614680 performed relatively poorly in terms of turf quality, percent green cover and dark-green color index. The objective of our study was to identify drought-tolerant seashore paspalum genotypes by characterizing their morphological and physiological responses to drought stress.įifteen genotypes of seashore paspalum ( Paspalum vaginatum) were grown in a controlled growth chamber environment under two water treatments: well-watered or water-stressed (withholding water for two weeks).Ī wide range of responses to drought were observed in the tested genotypes.
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