Survival rate of mutant and overexpression lines after drought stress. Irrigation was withheld from 12 21-d-old seedlings of each genotype until soil moisture content dropped to less than 3% (approximately 2 weeks). Plants were rewatered and scored for survival after a further week. A, Wild-type (white bars) and 35S::AtRALFL8 plants (red bars) 1 week after rewatering. B, Survival rate of each genotype compared with wild-type plants (shown as 100%). Asterisks show a significant difference from the wild type (**P < 0.01, *P < 0.05) according to χ² tests.