Altamirano María, Flores-Moya Antonio, Kuhlenkamp Ralph, Figueroa Félix L
Facultad de Ciencias, Universidad de Málaga, Spain.
Zygote. 2003 May;11(2):101-6. doi: 10.1017/s0967199403002132.
Sensitivity to ultraviolet (UV) radiation (UV-A, lambda = 315-400 nm; plus UV-B, lambda = 280-315 nm) of zygotes of the brown alga Fucus serratus L. (Phaeophyta) has been assessed through effects on growth of developing germlings. Different stages of development were distinguished by considering 5 h periods of time after fertilisation. Both the stage of the zygote and the UV radiation condition significantly affected growth of developing germlings. The negative response of growth rate of early stages of the zygotes to UV radiation seemed to be caused by UV-B rather than UV-A radiation, as the lowest relative growth rates were always estimated for germlings developed from zygotes irradiated with UV-B radiation. As regards the stage of the zygote, those germlings that developed from zygotes irradiated at 5-10 h after fertilisation showed the strongest inhibition of growth compared with the other stages. These results point to polarisation as the most UV-sensitive process during the first 24 h of the development of the zygote. A non-linear relationship between the developmental stage of the zygote and the sensitivity to UV radiation is suggested.
通过对发育中的幼孢子体生长的影响，评估了褐藻锯齿墨角藻（Phaeophyta）合子对紫外线（UV）辐射（UV-A，波长 = 315 - 400 nm；加上UV-B，波长 = 280 - 315 nm）的敏感性。通过考虑受精后5小时的时间段来区分不同的发育阶段。合子阶段和紫外线辐射条件均显著影响发育中的幼孢子体的生长。合子早期阶段的生长速率对紫外线辐射的负面反应似乎是由UV-B而非UV-A辐射引起的，因为从经UV-B辐射照射的合子发育而来的幼孢子体的相对生长速率总是最低的。就合子阶段而言，与其他阶段相比，从受精后5 - 10小时照射的合子发育而来的幼孢子体生长受到的抑制最强。这些结果表明，在合子发育的最初24小时内，极化是对紫外线最敏感的过程。合子的发育阶段与对紫外线辐射的敏感性之间存在非线性关系。
