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A decline in nitrogen availability affects plant responses to ozone
Author(s) -
Bielenberg Douglas G.,
Lynch Jonathan P.,
Pell Eva J.
Publication year - 2001
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.2001.00185.x
Subject(s) - abscission , cutting , senescence , ozone , photosynthesis , biology , growing season , botany , horticulture , sprouting , nitrogen , chemistry , organic chemistry , microbiology and biotechnology
Summary• The effects are presented here of a decline in nitrogen (N) availability on ozone (O 3 )‐induced accelerated foliar senescence during the growing season in a hybrid poplar. • Cuttings of Populus trichocarpa × maximowizii were grown in sand culture where N supply to the plant could be controlled on a daily basis and reduced in half of the plants when desired. All plants received charcoal‐filtered air; half also received supplemental O 3 . • Ozone and N withdrawal both reduced plant growth. Plants grown in both N treatments displayed leaf senescence and abscission in response to O 3 , but leaf abscission in the N‐withdrawal treatment was approximately double that of the constant‐N treatment. Ozone had differential effects on light‐saturated net photosynthesis (A sat ) and total soluble protein in the younger and older foliage depending on N treatment. • A decline in N availability increased the rate of O 3 ‐induced accelerated senescence and was associated with plant size and possibly continued active growth. Compensatory responses of young leaves to O 3 exposure only occured when N availability to the plant declined and O 3 ‐induced accelerated senescence was most severe.