The discovery of substantial quantities of proline analogues (Figure 7) in the leaves of some Melaleuca species highlights a potentially commercial source of industrial chemical compounds. Coupled with the recent interest in biochemical changes in plants suffering water and salinity stress, is the ability of drought resistant species to accumulate proline and proline analogues including glycinebetaine. Investigations have shown that, when subject to water or salinity stress under glass house or laboratory conditions, proline (27) and trans-4-hydroxy-N-methyl-L-proline (29) in M. lanceolata and trans-4-hydroxy-N-methyl-L-proline (29) and N, N'-dimemyl-trans-4-hydroxy-L-proline (30) levels in M. uncinata increased (Naidu et al. 1987).
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