匍枝马尾藻有性繁殖和人工育苗的初步研究

为研究匍枝马尾藻有性繁育过程的特点和人工育苗的可行性,通过野外观察和室内培养观察的方法,对匍枝马尾藻雌雄生殖托特点、受精卵分化等有性繁育过程、以及假根的形成、幼苗发育进行了研究,此外还对匍枝马尾藻的人工育苗进行了初步探索。试验结果表明,匍枝马尾藻的繁殖季节集中在每年的5—6月份;水温达到28℃时,生殖托出现排精排卵现象;从受精卵发育到形成具有假根的幼苗约需要48h;幼苗发育缓慢,35d后出现原生叶。人工育苗结果显示,幼苗栽培35d,幼苗株高为2.5~3mm,密度为6~10株/cm2;海区栽培60d后,匍枝马尾藻幼苗株高可达到7cm,幼苗密度为2株/cm2。本试验结果为匍枝马尾藻的人工规模环境育苗提供了技术指导。

Sexual Reproduction and Artificial Breeding of Brown Alga Sargassum polycystum

In order to study the characteristics of sexual reproduction process and explore the feasibility of artificial seedling of brown alga Sargassum polycystum ,a systematical observation was conducted through the method of field observation and indoor‐culture observation including characteristics of male and female receptacles ,differentiation of the fertilized egg ,rhizoid formation ,grow th of the young seedling .In addi‐tion ,the artificial seedling experiments were carried out in the laboratory .The results showed that the re‐production was found around May and June annually at temperature of 28 ℃ ,and that eggs and sperms were release from receptacles .It took 48 hours for the fertilized eggs to develope into young seedling with rhizoid;after 35 days ,the protophyll were formed .The artificial breeding indicated that the brown alga had body length of 2 .5—3 mm ,and the average seedling density of 2—3 per cm2 ;after 60 days cultiva‐tion ,the length of the brown alga reached to 7 cm ,with average seedling density of 2 per cm2 .The find‐ings laid the technical guidance to artificial seedling of S .polycystum .