Relationship between the self-incompatibility and cAMP level in Lilium longiflorum.
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.
Tsuruhara
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A
Division of Informatics for Natural Sciences, Graduate School of Human Informatics, Nagoya University, Chikusa-ku, Nagoya, 464-8601 Japan.
Tezuka
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T
D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000378:metabolism*; D000249:Adenosine Monophosphate / Q000378:metabolism / Q000494:pharmacology; D000262:Adenylyl Cyclases / Q000378:metabolism*; D005298:Fertility / Q000502:physiology; D005306:Fertilization / Q000502:physiology; D008129:Lolium / Q000201:enzymology / Q000502:physiology*; D011058:Pollen / Q000502:physiology
D000249:Adenosine Monophosphate; D015105:3',5'-Cyclic-AMP Phosphodiesterases; D000262:Adenylyl Cyclases