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

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．

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

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.