在植物的生命周期中从营养生长到开花是发育过程的重要转折。花启动的时机对生殖生长的成功至关重要。植物开花时间突变体的获得,在揭示植物花发育的奥秘中起了十分重要的作用。本研究以模式植物拟南芥(A rabid op sis tha liana)为材料,将野生型拟南芥(Co lum b ia生态型)的种子用甲基黄酸乙酯(EM S)诱变处理,将经诱变处理的种子M1播种收获M2种子用于突变体筛选。以初生莲座叶片数作为筛选指标,筛选出一株晚花突变体,命名flx(flow ering locus x)。
Systemic acquired resistance (SAR), known as the broad-spectrum, inducible plant immunity,is a defense response triggered by pathogen infection. The response starts from the recognition of plant resist-ance (R) with the corresponding avirulence (avr) gene from the pathogen. There are some genes for conver-gence of signals downstream of different R/avr interacting partners into a single signaling pathway. Salicylicacid (SA) is required for the induction of SAR and involved in transducing the signal in target tissues. The SAsignal is transduced through NPR1, a nuclear-localized protein that interacts with transcription factors thatare involved in regulating SA-mediated gene expression. Some chemicals that mimic natural signaling com-pounds can also activate SAR. The application of biochemical activators to agriculture for plant protection is anovel idea for developing green chemical pesticide.
ZHAO Shu-qing and GUO Jian-boLaboratory of Biotechnology , Shanxi University , Taiyuan 030006 ,P. R. China
