Proline Accumulation during Water Stress in Resurrection Plants

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Abstract
In leaves of resurrection plants dried intact, free proline increased in nine species and remained unchanged or declined in two other tolerant species. Infiltration of proline into hydrated resurrection leaves of two species (a relatively high accumulator of proline, Borya, and low accumulator, Myrothamnus) prior to dehydration did not improve the cells' survival rate, and in some cases caused a decrease in survival. These data indicate that the extreme drought tolerance of resurrection plants is not related per se to proline levels.