The selective breeding of wild Porphyra haitanensis and its economical character

The samples of wild Porphyra haitanensis were collected from different environment in Pingtan Island of Fujian Province.Through enzymolysis to somatic cells and their self-reproduction, the conchocelis and thallus of wild stain B, C and D were obtained after 2~3 years selection and cultivation.The results are as follows: (1) The wild-selected strain B, C and D exhibited relatively faster growth, which was about 3.25~3.75 cm/d.The thallus growth of Strain A, which has not been selected, was about 2.12 cm/d.Traditional cultivated strain exhibited the slowest growth, only 1.37 cm/d.(2) Strain B exhibited remarkable resistance to high temperature.The increasing rate of weight per day could reach up to 4.34% after cultured for 10 days in 30, while the control stain began to rot after cultured for 5 days in 27.(3) Strain B exhibited remarkable tolerance to low capacity of N and P.In low nitrogen and phosphorus environments, the blades color of strain B became buff after 9 days cultivation.But it recovered to normal condition after cultured for 3 days in seawater of normal content of nitrogen and phosphorus.However, the control group began to rot in the middle part of blade after 6 days and the rot ten proportion was about 2/3 in 9^th days in the same condition.(4) The phycobiliproteinin content of stain B was 98.89 mg/g, but the number was only 50.04 mg/g when it comes to control group.Therefore, strain B shows superiority in growth rate, high-temperature resistance and low-N-and-P tolerance.The results are helpful for genetic improvement, wild strains selective breeding and utilization in P.haitanensis.