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SEXUAL REPRODUCTION IN PANDORINA UNICOCCA 1
Author(s) -
Rayburn William R.
Publication year - 1974
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1974.tb02711.x
Subject(s) - mating , biology , sexual reproduction , mating type , zygote , reproduction , sulfur , nitrogen , nutrient , sexual differentiation , botany , zoology , ecology , biochemistry , gene , embryogenesis , chemistry , organic chemistry
SUMMARY The effects of nutrients and light on sexual reproduction were investigated in 2 mating pairs of Pandorina unicoca. Strains 101–104 required nitrogen deficiency for sexual differentiation. Sulfur deficiency also appeared to be effective in evoking sexual differentiation. The time required for sexual differentiation of strains 103–104 after removal of KNO 3 and MgSO from the medium was 24 hr. Addition of KNO 3 and MgSO 4 after 24hr did not reverse sexual differentiation. Light was required during the first 10–12 hr. Strains 105–106 did not require a period of sexual differentiation and, exhibited mating activity in the presence of nitrogen and sulfur in the medium. Both mating pairs required light for the mating response and calcium was necessary for zygote formation. The pH range for mating activity was determined.