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Plant and Cell Physiology, 2001, Vol. 42, No. 2 245-249
© 2001 Oxford University Press

Improved Salt Tolerance of Transgenic Tobacco Expressing Apoplastic Yeast-Derived Invertase

Eiichi Fukushima1, Yuuto Arata1, Tsuyoshi Endo ,1,3, Uwe Sonnewald2 and Fumihiko Sato ,1,3,4

1 Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502 Japan 2 Institute for Plant Genetics and Crop Plant Research, Corrensstrasse 3, D-06466 Gatersleben, Germany

We investigated the salt tolerance of transgenic tobacco, in which yeast invertase is expressed in the apoplastic (Apo-Inv) spaces. Whereas photosynthetic activities in wild-type tobacco in light were inhibited under salt stress, transgenic Apo-Inv tobacco maintained constant photosynthetic activities. The physical appearance of plants under salt stress also indicates that yeast invertase expression in the apoplastic space is beneficial for inducing salt tolerance. Apo-Inv tobacco had a much higher osmotic pressure increase in the cell sap than did wild-type tobacco under this type of stress. The physiological importance of sucrose metabolism under salt stress is discussed.

3 Present address: Division of Integrated Life Sciences, Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502 Japan.

4 Corresponding author: E-mail, fumihiko@kais.kyoto-u.ac.jp; Fax, +81-75-753-6398.


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