Comparative study of the Nicotiana species with respect to water deficit tolerance during early growth |
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| Authors: | Toshiyuki Komori Patricia N Myers Shigehiro Yamada Tomoaki Kubo Hidemasa Imaseki |
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| Institution: | (1) Plant Breeding and Genetics Research Laboratory, Japan Tobacco Inc, 700 Higashibara, Toyoda, Iwata, Shizuoka 438-0802, Japan |
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| Abstract: | Sixty Nicotiana species were examined for tolerance against various osmotica for seed germination and seedling growth in vitro. The species showed a wide variety of tolerance, and based on the results of the in vitro tests, 31 species were selected and further evaluated for salt and drought tolerance in a glasshouse. The degrees of tolerance
of germination among the 57 species toward NaCl were approximately related to those toward mannitol, indicating that the osmolarity
plays a majorrole in seed germination. However, the responses during the seedling growth differed in NaCl and mannitol or
drought, and there was no correlation between salt and drought tolerance. Based on the responses in vitro and in the glasshouse, N. paniculata and N. excelsior were selected as the salt tolerant species, and N. arentsii as the salt sensitive species. The degrees of accumulation of dry matter and of Na+ in the leaves were different in the two tolerant species; during NaCl treatment, N. paniculata and N. arentsii accumulated less dry matter relative to the control plants than N. excelsior, and N. paniculata accumulated more Na+ in its leaves than N. excelsior and N. arentsii. It is assumed that the two salt tolerant species have different mechanisms for tolerance to the salt.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | drought tolerance Nicotiana species salttolerance water deficit |
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