"proline production in relation to stress in Sesleria oaerulea L..”

Leaves of plants grown under optimum conditions contain a very low proportion of proline amongst their free amino acids. However, after having water withheld for a period of 24 hours or more, the proline content of the leaves becomes many times that observed as being normal. Large scale accumulation of proline also takes place in response to low temperature treatment, increased calcium ion concentrations and developmental stress. Inter-population variation with regard to stress induced proline production has been observed as well as Intro-population variation.