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![[Mark/Unmark this article]](83.files/b98.gif)
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| BA:
| 19910300812
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| ET:
| On the mechanism of
skotodormancy induction in Grand Rapids lettuce (Lactuca sativa
L.) seeds.
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| AU:
| Thanos, C. A.;
Georghiou, K.
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| AA:
| Institute of General
Botany, University of Athens, Athens 15784, Greece.
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| SO:
| Journal of Plant
Physiology, 1988, Vol.133, No.5, pp.580-584, 24 ref.
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| AB:
| Prolonged imbibition of
lettuce cv. Grand Rapids seeds in darkness resulted in a gradual loss of
responsiveness to a short (10 min.) red irradiation. This induction of
skotodormancy was clearly shown to be temperature dependent above a
critical temperature between 15 deg and 17.5 deg C. At lower temperatures
(15 deg and 10 deg ) skotodormancy was not induced during the 20-d
incubation period tested. When lettuce seeds were kept under continuous
far-red illumination, instead of being pretreated in darkness, the
induction of dormancy did not attain the final level of the dark-incubated
seeds. Moreover, the responsivity to red light was eventually resumed
after several days in continuous far-red light and the higher the fluence
rate the earlier the recovery of responsivity. In fact, at the highest
far-red fluence rate used, no additional dormancy was imposed. Germination
of seeds pretreated with far-red light was markedly delayed compared with
untreated seeds. Both the induction of skotodormancy and the reverse
effect produced by high-fluence continuous far-red illumination are
discussed with reference to phytochrome and its postulated reaction
partner X.
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| DE:
| Phytochrome; Lettuces;
seeds; dormancy; light; temperature; treatment; red light; far red light;
germination; vegetables
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| OD:
| Asteraceae; Lactuca
sativa
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| UP:
| Asterales; dicotyledons;
angiosperms; Spermatophyta; plants; Lactuca; Asteraceae
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| IS:
| 0176-1617
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| CC:
| FF060;
FF900
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| LA:
| English
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| DT:
| Journal article
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| SC:
| Horticultural Abstracts;
Seed Abstracts; Crop Physiology Abstracts
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