Abstract：Global warming affects the interactions between horticultural crops and pathogens in both greenhouse and open field cultivation，posing a severe threat to the yield，quality，and safety of horticultural products．However，the effects of sub-high temperatures on the defense responses of horticultural crops remain unclear．Pseudomonas syringae pv. tomato（Pst），the causal agent of bacterial speck disease，widely infects tomato cultivation in China．The high-resistant tomato ‘LA3472’with Pto gene resistant to Pst，and its background genotype，high-sensitive tomato ‘Moneymaker’，were used as test materials，to investigate two different resistance pathways of tomato against Pst DC3000，PAMPs-triggered immunity（PTI）and effector-triggered immunity （ETI），at sub-high temperature．Results showed that sub-high temperature had no significant effect on the in vitro growth of Pst model strain Pst DC3000，but significantly increased the occurrence of speck disease in both ‘Moneymaker’ and ‘LA3472’．Moreover，sub-high temperature remarkably suppressed the Pst DC3000-induced salicylic acid（SA） accumulation and transcript abundance of SA-biosynthetic gene PALs and SA signal-related gene NPR1 in both tomato genotypes．These results suggest that sub-high temperature has inhibitory effects on both PTI and ETI，and it is inferred to be related to the inhibition of SA resistance pathway．This research has theoretical and practical significance for understanding the occurrence of horticultural crops diseases and strengthening disease prevention under climate warming conditions．
王安然，史军营，胡璋健，王娇，喻景权，师恺. 亚高温环境下番茄对细菌性斑点病病原菌的抗性变化及其机制研究[J]. 中国蔬菜, 2021, 1(11): 37-44.
WANG Anran,SHI Junying,HU Zhangjian，WANG Jiao，YU Jingquan，SHI Kai. Effects and The Underlying Mechanism of Sub-high Temperature on Plant Resistance to Pseudomonas syringae in Tomato. China Vegetables, 2021, 1(11): 37-44.
