温度和光照胁迫下鹧鸪菜的繁殖策略

Reproductive Strategy of Caloglossa leprieurii (Montagne) J. Agardh under Temperature and Light Stresses

摘要:

为探讨潮间带红藻鹧鸪菜[Caloglossa leprieurii （Montagne） J. Agardh]在温度和光照胁迫下的繁殖策略，在实验室不同温度和光照下培养鹧鸪菜，对其四分孢子和果孢子的发生、放散及萌发进行研究。结果表明，高温和低光照有利于四分孢子的产生、放散和萌发，低温和强光不利于四分孢子的产生、放散和萌发；20℃和25℃时产生的四分孢子囊最多，15℃次之，而10℃则不产生。在36 μmol m^-2s^-1 光照下四分孢子的放散数量最多。温度对于果孢子的放散和萌发没有明显的影响，而低光照有利于果孢子的放散和萌发。高温及强光对鹧鸪菜幼苗的生长发育有明显的抑制作用，且已经萌发的幼苗存活时间较短。因此，鹧鸪菜为应对高温和强光胁迫，通过产生大量的四分孢子和果孢子以选择适宜的生长发育时机。

Abstract:

In order to understand the reproductive strategy of red alga Caloglossa leprieurii (Montagne) J. Agardh under temperature and light stresses, the occurrence, bleeding and germination of tetraspores, carpospores of the alga cultured in laboratory were studied. The results showed that high temperature and low light intensity were in favor of tetraspores formation, bleeding and germination, however, did not under low temperature and high light intensity. The tetraspores were the most under 20℃ and 25℃, and followed by 15℃, there was not tetraspore under 10℃. The number of tetraspores released was the largest under light intensity of 36 μmol m^-2s^-1. The temperature had not obvious effects on carpospores release and germination, while low light intensity was beneficial. The growth of seedlings was inhibited under high temperature and light. The survival time of germinated seedlings was short. Therefore, reproductive strategy of C. leprieurii responded to high temperature and strong light stresses was by producing a lot of tetraspores and carpospores in proper time.