渗透胁迫和水淹对不同抗旱性小麦品种幼苗叶片多胺含量的影响

Efects of osmotic stress and water logging on polyamines content in leaves from wheat varieties with different drought tolerance

在根际渗透胁迫和离体叶片水淹条件下处理抗旱性小麦品种（旱选4号）和不抗旱性小麦品种（陇春10号）幼苗,结果表明：叶片中Put累积远大于Spd和Cad的含量．渗透胁迫下，旱选4号Put累积量大于陇春10号；而水淹时，两者Put相差不大，表明两种不同胁迫对不同小麦品种Put的生物合成和降解具有不问的作用．不同程度渗透胁迫的处理结果表明，在轻度胁迫下，多胺含量有较为明显的增加．提示多胺在胁迫防御反应中可能起第二信使或生长调节物质的作用．

Polyamines accumulation under osmotic stress and water logging wascompared in leaves and leaf segments of two wheat varieties, drought tolerantehanxuan No. 4 and drought sensitive longchun No. 10. The results show that pu-trescine content of two wheat rarieties both increased greatly under two stress,whereas spermidine and cadaverine content is much less under osmotic stress. Pu-trescine content of Hanuan No. 4 leaves is much higher than that of Longchun No.10. Under water logging, however, putrescine accumulation in two wheat varietiesis similar, indicating that as regards putrescine bios ythesis and degradation, os-matlc stress and water logging are different c0nditions. Although under light os-motic stress, ployamine content increased pronouncedly, implicating that ploy-aminemay act as second messenger.