Increase of root dry weight of strawberry by simultaneous application of cool air and CO₂ and evaluation using carbon stable isotope ratio

Abstract

Effects of simultaneous application of cool air and CO₂ were evaluated on initial growth of strawberry (‘Yotsuboshi’). However, these treatments did not increase shoot dry weight, the root fresh and dry weight were increased. Natural abundance of ¹³C of both parts are decreased significantly by the treatment, these results suggested that applied CO₂ was absorbed and translocated to the root. Even though CO₂ concentration has been maintained around 600 μmol mol^－1 in the day time, CO₂ use efficiency evaluated by ¹³C natural abundance was estimated only 51%. Natural abundance of ¹³C could be an indicator for developing more efficient CO₂ application method.