Met对渗透胁迫下小麦幼苗内源多胺含量和乙烯产生的影响

渗透胁迫下，小麦幼苗内源多胺含量和乙烯产生均明显增加，再用0．4mmoL甲硫氨酸掺人处理后，乙烯释出加速，精胺含量进一步增多，亚精胺含量变化不大，腐胺的含量几乎减少到胁迫前的水平。可见，渗透胁迫下，甲硫氨酸既可以在Met循环中以甲硫氨酸与腐胺联合生成亚精胺，进而再与亚精胺联合生成精胺，又可以S-腺苷甲硫氨酸分解生成5’-甲硫基腺苷和氨基环丙烷羧酸，最后由氨基环丙烷羧酸加氧生成乙烯。

EFFECT OF Met ON ENDOGENOUS POLYAMINE CONTENT AND ETHYLENE PRODUCTION IN WHEAT SEEDLINGS UNDER OSMOTIC STRESS

Both endogenous polyamine content and ethylene production in wheat seedling apparently increased under osmotic stress. Besides all above,with 0. 4 mmol Met participating in the wheat seedlings,the ethylene production speeded up,the spermine content took further steps to get a raise. The spermidine content didn't almost take place any changes, but the putrescine content decreased. Therefore, under osmotic stress, not only did Met combined with putrescine in the form of SAM to produce spermidine,with spermidine to result in spermine once again ;but also was it decomposed into MTA and ACC in the form of SAM. ACC meet with o] to produce ethylene,MTA might be recycled to Met via Met cycle.