Interaction between nitrogen deficit of a plant and nitrogen content in the old leaves [Examined with Helianthus annuus]
1996
Ono, K. (Tokyo Univ. (Japan)) | Terashima, I. | Watanabe, A.
We examined changes in nitrogen content of the first leaves in relation to growth and nitrogen status of sunflower (Helianthus annuus L.) plants that were raised hydroponically at two irradiance levels (high and low light, HL and LL) and at two nitrogen concentrations (high and low nitrogen, HN and LN). Initial increases in total dry mass and total nitrogen of the whole plant were faster in HL-plants than in LL-plants irrespective of nitrogen supply, but in LN-plants the increase in total nitrogen was soon blunted. When plants grown under the same irradiance were compared, nitrogen content of the fist leaves (leaf N) decreased faster in LN-plants than in HN-plants, while for the plants grown at the same nitrogen concentrations, it decreased faster in Hl-plants than in LL-plants
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