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Plant and Cell Physiology, 2001, Vol. 42, No. 11 1234-1238
© 2001 Oxford University Press

Relationship between the Self-Incompatibility and cAMP Level in Lilium longiflorum

Akiko Tsuruhara and Takafumi Tezuka1

Division of Informatics for Natural Sciences, Graduate School of Human Informatics, Nagoya University, Chikusa-ku, Nagoya, 464-8601 Japan

The elongation of pollen tubes in Lilium longiflorum cv. Hinomoto after self-incompatible pollination stopped halfway, but that after cross-compatible pollination (cross with cv. Georgia) did not. The elongation of pollen tubes after self-pollination was enhanced by exogenous cAMP and by pertussis toxin or cholera toxin, which activates adenylate cyclase. The level of endogenous cAMP in pistils after self-pollination was approximately one half of that after cross-pollination. Furthermore, the activity of adenylate cyclase in pistils after self-pollination was also approximately one half of that after cross-pollination. By contrast, cAMP phosphodiesterase in pistils after self-pollination was approximately 2 times as high as that after cross-pollination. A possible correlation between self-incompatibility and the low level of endogenous cAMP in lily pistils is discussed on the basis of these results.

1 Corresponding author: E-mail, tezuka@info.human.nagoya-u.ac.jp; Fax, +81-52-789-4230.


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