关键词: 苦槛蓝挥发油, 驱避作用, 小菜蛾, 四臂嗅觉仪

Abstract: Six soils with different land use patterns, i.e., rice field (Eshan, E), corn fields (Beicheng 1, B1; Beicheng 2, B2), mountain slope dry land (Xinping, X), and vegetable fields (Tonghai Sijie, T1; Tonghai Sangyuan, T2), in low latitudinal plateau Yuxi tobacco-growing area were sampled and cultivated with tobacco variety K326 in pots, aimed to study the effects of the soils on the K326 growth and photosynthetic physiology under the same climatic condition and same managements. The tobacco plants grew better on the soils of mountain slope dry land, rice field, and corn fields than on the soils of vegetable fields (except B1). The netphotosynthetic rate (P_n) was higher on the soil of Xinping (X) than on the others; and the stomatal conductance (G_s), intercellular CO₂ concentration (C_i), and transpiration rate (T_r) were higher but the stomatal limitation value (L_s), water use efficiency (WUE), and intrinsic water use efficiency (IWUE) were lower on the soils of Xinping (X) and Eshan (E). The P_n of K326 growing on the soils of corn fields and vegetable fields was mainly affected by stomatal factors, while the P_n of K326 grown on the soil of rice field was mainly affected by nonstomatal factors, such as lower carboxylation capability, photosynthetic pigments, and soluble protein content. The K326 grown on the soils of Eshan and Xinping had poor stomatal regulation capability. The higher soil water content in the soils of Eshan and Xinping caused the increase of G_s and T_r and the decrease of WUE. No significant differences were observed in the leaf fresh weight water content and natural water saturation deficit among the tobacco plants grown on the test soils, but the watercontent of per unit leaf area was significantly lower for the plants grown on the soils of vegetable fields, compared with that on the soil of rice field, which could be related to the specific leaf mass (SLM) to some extent. The results indicated that the effects of different land use pattern soils on tobacco growth and photosynthetic physiology were complicated, which not only related to the soil characteristics, but also related to the plant itself physiological characteristics under different soil conditions.

Key words: Myoporum bontioides volatiles, Repellent action, Plutella xylostella (DBM) abstract, 4-arm selective olfactometer