抗锈小麦新品系与感病品种甘麦8号的水杨酸含量和相关酶类活性的变化

抗锈小麦新品系89144接种锈菌后SA含量升高,同时CAT活性降低,H2O2含量升高,SOD活性升高,在不抗锈品种甘麦8号接种锈菌后SA含量也有升高,但并不伴随有CAT活性下降和SOD活性升高以及H2O2含量的升高.推测SA为CAT过氧化活性提供一个电子的过程中SA的量必须达到一定的阈值,并且与CAT的时序调节相配合.据SA结合态和游离态含量的变化

Change in SA Content and Relative Enzymes Activities in Two Wheat Varieties Differing in Rust-resistance after the Inoculation of Puccinia striiformis f.sp.tritici

Changes in SA content and relative enzymes activities were investigated after the inoculation of Puccinia striiformis f. sp. tritici. in leaves of two spring wheat ( Triticum aestivum) varieties that differ in rust resistance: 89144(rust resistant) and Ganmai 8(rust sensitive). In 89144, the increase in SA content was accompanied with the decrease in CAT activity and increase in H 2O 2 content and SOD activity. While in Ganmai 8, the increase in SA content was not accompanied with the above changes observed in 89144. It was deduced that only when the content SA reached a certain level, could it give e - to CAT and coordinate with the regulation of CAT. According to the dynamic changes of the content of free and combine SA, it was concluded that other regulation mechanisms might be existed in the upstream of the signaling transduction pathway and SA signaling transduction pathway might be employed in 89144.