Effect of imbibition temperature on the seed germination of barley and rice

为阐明大麦种子和水稻种子在高温和低温下萌发抑制的机制，研究了关键脱落酸（ABA）生物合成基因和ABA分解代谢基因（9-顺式环氧类胡萝卜素双加氧酶基因和ABA 8′-羟化酶基因）的表达模式。表达分析表明，这些基因在吸胀过程中表达模式的变化可能部分反映了高低温条件下大麦和水稻种子萌发的抑制作用。

To elucidate the mechanisms of germination inhibition in barley seeds at high temperature and rice seeds at low temperature, the expression patterns of key abscisic acid (ABA)-biosynthetic and ABA-catabolic genes (9-cis-epoxycarotenoid dioxygenase genes and ABA 8'-hydroxylase genes) were examined. Expression analyses revealed that the change of ABA content via the varying expression patterns of these genes during imbibition might be reflected, in part, in the germination inhibition of barley and rice seeds at high/low temperature.