关键词: 植烟密度, 高温逼熟, 酶活性, 田间微气候, 化学成分, 经济性状

Abstract: In order to determine the influence of bacco plant density on the phenomenon of “high temperature induced maturity”, this paper designed five different planting densities: 13 500 plants/hm2, 15 000 plants/hm2, 16 500 plants/hm2, 17 250 plants/hm2, and 18 000 plants/hm2; and studied the field microclimate, the incidence rate of “high temperature induced maturity”, the activity of antioxidant enzymes, the chemical component and the economic characteristics with different planting densities. The results showed that the incidence rate of “high temperature induced maturity” under the treatment of 15 000 plants/hm2 was the lowest; there was no significant correlation between field microclimate and incidence rate of “high temperature induced maturity” under this treatment, which suggested the planting density did not affect the incidence of “high temperature induced maturity” with planting density of 15 000 plants/hm2. The activities of peroxidase (POD), polyphenol oxidase (PPO), superoxide dismutase (SOD), and catalase (CAT) in tobacco leaf were more active under the treatment of 15 000 plants/hm2 than those under other treatments. Under the planting density of 15 000 plants/hm2, the chemical composition of tobacco leaf was suitable and its economic characteristics were the best. Therefore, compared with other treatments, the planting density of 15 000 plants/hm2 was conducive to improve the peroxidases activity response to stress, reduce the incidence of “high temperature induced maturity”, and improve the yield and quality of flue-cured tobacco leaves.

Key words: planting density, high temperature induced maturity, enzyme activity, field microclimate, chemical component, economic characteristic