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- W2019977853 abstract "Gametophytes of Laminaria saccharina cultivated from zoospores in a light-dark regime (16:8), release eggs exclusively during the dark cycles, 8–10 days after seeding of the zoospores, and mainly during the first 30 min of darkness. The inhibiting effects of light during the light cycle of 16 h per day is also apparent in gametophytes which have experienced only two dark cycles prior to day 8, when egg release begins. Egg release can be shifted to any time during the light cycle by prolonging the irradiation with white fluorescent light and by subsequent darkening for 1 h. In gametophytes cultivated in continuous white fluorescent light eggs are also released from day 8–10, so in this case no inhibiting activity of light is apparent. Egg release is inhibited by blue light and u.v., with peak wavelengths for inhibition at 372, 413, 438 and 481 nm. No inhibition occurs at wavelengths above 513 nm. The light requirement for inhibition is very low. A photon fluence rate of 1·4 μE m-2s-1, given for 45 min at 449 nm, inhibits egg release in 50% of the mature gametophytes. There is some evidence that a circadian rhythm is involved, primarily since in gametophytes which are transferred at the beginning of day 8 from 16:8 to constant conditions (darkness, continuous red or green light) the diel rhythm of egg release persists until day 11." @default.
- W2019977853 created "2016-06-24" @default.
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- W2019977853 date "1981-12-01" @default.
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- W2019977853 title "Egg release in gametophytes of<i>Laminaria saccharina</i>: Induction by darkness and inhibition by blue light and u.v." @default.
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- W2019977853 doi "https://doi.org/10.1080/00071618100650441" @default.
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