Egg release in gametophytes of Laminaria saccharina: Induction by darkness and inhibition by blue light and u.v.
Egg release in gametophytes of Laminaria saccharina: Induction by darkness and inhibition by blue light and u.v.
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DOI：
10.1080/00071618100650441
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发表时间：
1981-12
影响因子：
2.4
通讯作者：
K. Lüning
中科院分区：
文献类型：
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作者：
K. Lüning
在光暗条件下（16：8）从游动孢子培养的海带配子体仅在游动孢子播种后8-10天的黑暗周期期间释放卵，并且主要在黑暗的前30分钟期间。在每天16小时的光周期期间，光的抑制作用在配子体中也是明显的，配子体在第8天之前仅经历了两个黑暗周期，此时卵子开始释放。通过延长白色荧光灯的照射时间并随后变暗1 h，可将卵释放转移到光周期中的任何时间。在连续白色荧光灯下培养的配子体中，卵也从第8-10天释放，因此在这种情况下，光的抑制活性不明显。卵的释放被蓝光和紫外线抑制，抑制的峰值波长为372、413、438和481 nm。在513 nm以上的波长处不发生抑制。抑制的光需求非常低。...='class10'> 45分钟，光子注量率为1.4 μE m ~（-2）s ~（-1）.
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 4...