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Influence of CO 2 on Reduction of Nitrate in Corn Seedlings
Author(s) -
STULEN INEKE,
LANTING L.
Publication year - 1978
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1978.tb04083.x
Subject(s) - nitrate , nitrate reductase , chemistry , nitrogen , horticulture , agronomy , nitrogen assimilation , zea mays , botany , biology , organic chemistry
The influence of CO 2 on the assimilation of nitrate in intact corn seedlings was measured with 15 N labelled nitrate, 24 and 48 h after the dark‐grown seedlings were transferred to the light, either in normal air or in CO 2 ‐free air. During the first 24 h CO 2 had no influence on nitrate reduction in intact seedlings. Experiments with detopped seedlings showed that during this period the roots were the only site of nitrate reduction. After 48 h seedlings grown in normal air had reduced more nitrate than detopped seedlings, and seedlings grown in CO 2 ‐free air had reduced the same amount of nitrate as detopped seedlings. During the whole 48 h period CO 2 had no influence on the level of nitrate reductase of the leaves. It was concluded that in normal air corn leaves started to reduce nitrate after a lag period of 24 h and that in CO 2 ‐free air they were incapable of nitrate reduction.