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CONTROL OF SEXUALITY IN GOLENKINIA
Author(s) -
Ellis Richard J.,
Machlis Leonard
Publication year - 1968
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1968.tb07417.x
Subject(s) - biology , phosphorus , nitrogen , sperm , nutrient , botany , light intensity , human fertilization , sexual reproduction , photosynthesis , zoology , ecology , anatomy , chemistry , physics , organic chemistry , optics
Sperm formation can be induced in strains 929 and 930 of the oogamous genus Golenkinia by nutrient depletion, specifically the deprivation of either nitrogen or phosphorus, but not by a decrease in total molarity or by a change in p H. Nitrogen (or phosphorus) concentration plays a controlling role in the presexual vegetative growth and the actual period of induction. During the latter, the rate of gametogenesis is inversely proportional to the nitrogen level and can be completely stopped by nitrogen added as many as 8 hr after resuspension in a medium lacking nitrogen. White light of an intensity of 10,000 ergs per cm 2 per second is required during the first 9 hr of resuspension in an inducing medium although a lower intensity is sufficient if given for longer periods. Sexuality in Golenkinia responds most strongly to red or blue light, indicating that photosynthesis is important in this process. Fertilization in strain 929 requires at least 0.001 m calcium. No evidence was found for the action of hormones either in sexual induction or in chemotactic sperm attraction.