Effects of abscisic acid on rooting stem cuttings of sweet potato in open top chambers under enriched CO2 environment

Abstract
Ten centimeter long stem cuttings of sweet potato (Ipomoea batatas L. cv. Georgia Jet) with intact apex and leaves were cultured in distilled water as well as in varying concentrations of abscisic acid (ABA) in open top chambers at 364, 438 and 666 cm3 m{-3}CO2. Low concentration of ABA promoted rooting and elongation of roots at 364 cm3 m{-3} CO2 while rooting was suppressed at enriched levels of CO2. However, biomass production in shoots and roots was higher in 666 than in 364 cm3 m-3 CO2.