Abstract
Excess nitrogen fertilization promotes vegetative growth, resulting in reduction of seed yield due to the decrease in the light utility efficiency. However, application of GSH or GSSG whose amount was equivalent to the excess nitrogen increased seed yield with little significant plant size in Arabidopsis thaliana. To investigate the effect that had not been seen when excess nitrogen supplied, we performed growth analysis of Arabidopsis wild-type plants with and without subirrigation of GSH or GSSG. In 4-week-old plants with subirrigation of GSH or GSSG, the leaf blades grew more round. Flowering was not markedly influenced by GSH or GSSG. At fifth week after imbibition, GSH or GSSG-subirrigated plants bolted and had increased nitrogen content, followed by remarkable increase in aerial biomass. Taken together, GSH and GSSG can increase biomass during the reproductive period without changing the length of vegetative period. We will also report the growth analysis results in details.
