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Response of shoot and root growth to supply of different nitrogen forms is not related to carbohydrate and nitrogen status of tobacco plants
Author(s) -
WalchLiu Pia,
Neumann Günter,
Engels Christof
Publication year - 2001
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/1522-2624(200102)164:1<97::aid-jpln97>3.0.co;2-z
Subject(s) - nitrogen , shoot , carbohydrate , botany , horticulture , agronomy , biology , chemistry , organic chemistry , biochemistry
In the present study, we investigated effects of homogeneous or localized supply of different nitrogen (N) forms on shoot and root growth of tobacco. While homogeneous supply of NH 4 + and N deprivation inhibited shoot growth compared with application of NO 3 — , the N form had no significant effect on root growth. In contrast, in a split‐root experiment, application of NH 4 + or N deprivation in one half of the root system repressed root growth compared with the other part of the root, which was supplied with NO 3 — . However, shoot growth was not affected by localized NH 4 + application or local N deprivation. Inhibitory effects on shoot and root growth by variations of N supply could not be related to limitations in N or C status of the plants or to NH 4 + toxicity. A possible involvement of NO 3 — as a signal compound including of phytohormones is discussed.