Regulations of the C2H4-forming system and the H2O2-scavenging system by heat treatment associated with self incompatibility in lily |
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| Authors: | Hajime Suzuki Akiko Tsuruhara T Tezuka |
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| Institution: | (1) Unit of Environmental Systems, Division of Informatics for Natural Sciences, Graduate School of Human Informatics, Nagoya University, Chikusa-ku, Nagoya, 464-8601, Japan e-mail: tezuka@info.human.nagoya-u.ac.jp Tel.: +81-52-789-5022, Fax: +81-52-789-4770, JP |
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| Abstract: | The mechanism of self incompatibility in pistils of Lilium longiflorum Thunb. cv. Hinomoto, which is overcome by heat treatment, was analyzed. Immersing detached pistils in a distilled water bath
held at 45°C for 5 min suppressed levels of ethylene and activities of 1-aminocyclopropane-1-carboxylate (ACC) oxidase at
6 h after self- and cross-incompatible pollination. However, the levels and activities showed no significant difference 48
h after pollination. Levels of ACC and activities of ACC synthase at 6 h after self-incompatible pollination were lower in
pistils with heat treatment. Moreover, the heat treatment suppressed the activity of superoxide dismutase and enhanced the
activity of catalase, ascorbate peroxidase, dehydroascorbate reductase, and glutathione reductase. In addition, the amount
of hydrogen peroxide (H2O2) was reduced by heat treatment. In summary, heat treatment suppressed the ethylene-forming system and also enhanced the hydrogen
peroxide-scavenging system in self-pollinated pistils associated with self incompatibility. A possible correlation between
self incompatibility and stress in pistils after self-incompatible pollination is discussed based on the results obtained
using heated pistils.
Received: 12 April 2000 / Revision accepted: 19 September 2000 |
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| Keywords: | Ethylene Heat treatment Lilium longiflorum Self incompatibility Stress response |
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