Effects of calcium on proline content and related enzymes activities in wheat seedlings under salinity
Effects of calcium on proline content and the relevant parameters were investigated in salt-stressed wheat seedlings. The results showed that proline content exhibited minor enhance under low salinity and significant increase under high salinity. Water-soluble carbohydrates and △' - pyrroline -5 - carboxylate reductase (P5CR) activity showed the same changing trend as proline. △' - Pyrroline -5 -carboxylate synthetase (P5CS) activity expressed insignificant changes under salinity. Proline dehydrogenase (PDH) only showed obvious increase under high salinity. Under salt stress K~+ content was obviously reduced, while Na~+ showed significant increase. After Ca~(2+) was applied, proline did not show obvious changes at low salinity, but showed significant decrease at high salinity, and their con?tents changed according to water-soluble carbohydrates content and P5CR activity. Ca~(2+) did not show obvious effect on P5CS activity and significantly increased PDH activity under high salinity. Ca~(2+) obviously decreased Na~+ content, increased K~+ content and the ratio of K~+/Na~+ in salt-stressed wheat seedlings. These results suggested that proline significantly accumulated only at high salinity, and Ca~(2+) could deduce obvious decrease in proline content in high salinity-stressed wheat plants. This effects might be related to the obvious decrease in P5CR activity and significant increase in PDH activity and the ratio of K~+ /Na~+.
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