Xu Guofeng, Zheng Yongquan, Dong Fengshou, Xu Shichang, Yao Jianren
Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, China.
Ying Yong Sheng Tai Xue Bao. 2006 Sep;17(9):1641-4.
With two sets of wheat near-isolines having different genetic background as test materials, this paper studied the dynamics of their DIMBOA (2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one) contents during Puccinia striiformis f. sp. tritici infection. It was revealed that in un-inoculated plants, no significant difference was observed in DIMBOA contents among various resistant and susceptible inbred lines within the same set. But, at the initial stage of infection, the DIMBOA contents in all resistant isolines displayed a quicker and greater increase, resulting in a significantly higher content of DIMBOA in resistant isolines than in susceptible one throughout the period of disease development. The infection ultimately led to a decline of DIMBOA contents in all infected plants, but the decrement was significantly less in resistant lines than in susceptible one. It could be concluded that DIMBOA was associated with the monogenic resistance to Puccinia striiformis f. sp. tritici in wheat. The study of DIMBOA dynamics in plants suffered from diseases and pests would be useful for understanding the mechanism of resistance, and the screening and breeding of crop varieties with multiple-resistance.
以两组遗传背景不同的小麦近等基因系为试验材料，研究了小麦条锈菌侵染过程中其2,4 -二羟基- 7 -甲氧基- 1,4 -苯并恶嗪- 3 -酮（DIMBOA）含量的动态变化。结果表明，在未接种的植株中，同一组内不同抗性和感病自交系间的DIMBOA含量无显著差异。但是，在侵染初期，所有抗性近等基因系中的DIMBOA含量均呈现更快、更大幅度的增加，导致在整个病害发展期，抗性近等基因系中的DIMBOA含量显著高于感病近等基因系。侵染最终导致所有受侵染植株的DIMBOA含量下降，但抗性品系中的下降幅度显著小于感病品系。可以得出结论，DIMBOA与小麦对小麦条锈菌的单基因抗性有关。研究植物在遭受病虫害时DIMBOA的动态变化，对于理解抗性机制以及多抗作物品种的筛选和培育具有重要意义。
