Impacts of environmental conditions, and allelic variation of cytosolic glutamine synthetase on maize hybrid kernel production.

Cytosolic glutamine synthetase (GS1) is the enzyme mainly responsible of ammonium assimilation and reassimilation in maize leaves. The agronomic potential of GS1 in maize kernel production was investigated by examining the impact of an overexpression of the enzyme in the leaf cells. Transgenic hybrids exhibiting a three-fold increase in leaf GS activity were produced and characterized using plants grown in the field.

[Pregnancy after ovariectomy as a result of preservation of the embryos].

We report the first published case of pregnancy obtained with a self-preserved embryo in a woman who, in 1987, had been castrated for a tumoral and painful pelvic disease retrospectively diagnosed as endometriosis. This woman had an old-standing tuboperitoneal infertility, and in vitro fertilization had been performed, followed by cryopreservation of the embryos. Two embryos were transferred during an artificially induced oestro-progestogenic cycle.