Abstract:

For defining the characteristics and selecting the ideal tobacco-growing areas of the flue-cured tobacco variety ‘KRK26’ introduced from Zimbabwe, optimizing distribution of flue-cured tobacco cropping in Yunnan. Using the method of slides observation under microscope, this study was conduced to investigate the anatomical structure of the mature fresh leaves from upper, middle and lower stalk positions of flue-tobacco ‘KRK26’ from five tobacco-growing areas of Yunnan. The results showed that: the leaf anatomical structure of ‘KRK26’ varied with the tobacco-growing areas. As the development and gap of mesophyll cells were well and moderate, the leaf thickness, palisade tissue thickness, thickness ratio of palisade to spongy of ‘KRK26’ from Wenshan growing areas were higher or significant higher than others , its leaf dissecting structure was best among the five growing areas. By contrast, the leaves of ‘KRK26’ from Lincang had minimum leaf thickness and palisade tissue thickness, and the discrepancy reached remarkable level, furthermore the thickness ratio of palisade to spongy of which were extremely significant lower than Wenshan and Baoshan, therefore its leaf dissecting structure was worse than other tobacco-growing areas. From the dissecting features closely related to tobacco quality, it seemed that: the suitable planting area for ‘KRK26’ was Wenshan.