Preliminary study on selecting the high temperature resistance strains and economic traits of Porphyra haitanensis

Owing to selecting the strains of high temperature resistance,F₃ generation of new strains coming from hybridizationin Porphyra haitanensis(Z-26,Z-61,Z-81,Z-17)was compared with the wild-type control group by inheritable traits.Results indicated that:(1)The four new strains of selective filament strains could normally growand develop after 40 d cultivated at 29℃ high temperature.Such as Z-26 filament grew faster;Z-61 was easily mature and 95% of the conchocelis filament sprouted into sporangial branch.There was only 30% of filament sprouted into sporangial branch in Z-17.(2)Z-26 and Z-61 were cultivated 10 d under the temperature of 30℃.Then they turned white but were not dead and could return theirintrinsical colour after 3~4 d cultivated at 21℃.(3)Blades of Z-81 and Z-17 which were cultivated 7~10 d at 29℃ turned white but were not dead and could return normal at 21℃.However,when cultivated 10 d under the temperature of 30℃,they were rotten and could not be recovered.(4) Wild-type control group was no high temperature resistance and they were rotten even dead after 5 days cultivated under the temperature of 27℃.The four stains of slection could resistthe high temperature, 1~3℃ higher,comparing with the wild-type control group.(5)The thallus of the four strains were cultivatied 10 d under the temperature of 26~28℃ and their main phycobiliprotein and chlorophyll a were quiet variance comparing with the thallus that were cultivated under the temperature of 21℃.It indicated thattemporary high temperature did not make effect on their quality.