sHSP22 can partially rescue ABA hypersensitivity of abi1-3. A, Cotyledon greening phenotype of Col-0, abi1-3, and abi1-3/sHSP22 homologous plants in half-strength MS medium and medium supplemented with 1 μm ABA. Representative seedlings were shown 9 d after imbibition. Bar = 0.5 cm. B, Statistic analysis of cotyledon greening in half-strength MS medium containing various concentrations (0, 0.5, and 1.0 μm) of ABA. Col-0, abi1-3, and abi1-3/sHSP22 complementation plants were germinated and grown for 9 d. The values are the means ± sd of triplicate repeats (n = 90, **P < 0.01). C, Root phenotype of representative seedlings grown on half-strength MS medium without or with 1 μm ABA shown in A. Bar = 0.5 cm.