Effects of antitranspirant and leaching on medium solution osmotic potential, leaf stomatal status, transpiration, abscisic acid content and plant growth in 'Early Girl' tomato plants (Lycopersicon esculentum)


Tomato plants (Lycopersicon esculentum Mill. cv. Early Girl) were grown in a medium containing peat moss and perlite (60:40% volume). The medium was drenched with 0 or 5% of antitranspirant GLK-8924. Half of the plants were flushed daily with 250 ml water (leaching) and the other half were subirrigated capillarity. The osmotic potential of medium solution was reduced significantly 5% antitranspirant GLK-8924 treatment, then recovered gradually to the control level after 4 d with leaching and 10 d without leaching. Leaf stomatal conductance (g(s)), transpiration rate (E) and plant growth were depressed the antitranspirant GLK-8924 application, and the depression was alleviated leaching. Neither antitranspirant GLK-8924 treatment nor leaching influenced leaf abscisic acid (ABA) content. The effect of antitranspirant GLK-8924 on leaf gas exchange and plant growth was highly correlated with the reduction in the osmotic potential of medium solution but not with leaf ABA content. Younger leaves had higher g(s) and E but lower ABA content than older leaves in general.



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Journal of Horticultural Science and Biotechnology