Effects of Dehydration and Rehydration on Photosynthesis of Detached Leaves of the Resurrective Plant Boea hygrometrica Cloning and Expression of a Gene Encoding a Raffinose Synthase in the Resurrection Plant Boea hygrometrica A Small C2-domain Protein from the Resurrection Plant Boea hygrometrica Promotes Plant Responses to Abscisic Acid