Microalgae and use for same
Provided is an alga belonging to Cyanidiophyceae having a diploid cell and a haploid cell form. Also provided is a nutrient composition containing an alga belonging to Cyanidiophyceae or an extract thereof.
1 . An algae culture comprising: an algae population consisting of algae belonging to Galdieria or Cyanidium,
wherein a ratio of the number of haploid cells of the algae to the total number of cells of the haploid cells and diploid cells of the algae contained in the algae culture is 70% to 100%, and
the algae culture is obtained by isolating a haploid cell which has no rigid cell wall from cells of the algae belonging to Galdieria or Cyanidium , and culturing the isolated haploid cell.
2 . The algae culture according to claim 1 , wherein the haploid cells are ruptured under a condition of pH 7.
3 . The algae culture according to claim 2 , wherein a ribulose 1,5-bisphosphate carboxylase/oxygenase large subunit gene of the algae has a base sequence shown in SEQ ID NO: 1 or 2.
4 . The algae culture according to claim 3 , wherein the algae are algae of a strain selected from the group consisting of a Cyanidium sp. YFU3 strain (FERM BP-22334), and a Cyanidium sp. HKN1 strain (FERM BP-22333).
5 . The alga culture according to claim 1 , wherein algae are transformants obtained by genetic modification using a genetic engineering technique.
6 . The algae culture according to claim 5 , wherein the transformants are obtained by using an auxotrophy-related gene as a selection marker.