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Root Growth and 14 C‐Translocation into the Roots of Maize ( Zea mays L.) as influenced by local Nitrate Supply
Author(s) -
Sattelmacher Burkhard,
Thoms Klaus
Publication year - 1989
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19891520102
Subject(s) - phloem , zea mays , auxin , chromosomal translocation , nitrate , botany , agronomy , biology , biochemistry , ecology , gene
A local nitrate supply to roots of maize causes increasing growth of the first order and the formation of higher order laterals. Number of first order laterals, however, remains unchanged. Labelling plants with 14 CO 2 demonstrates a specific phloem unloading in the supply zone. It is suggested that phloem mobile phytohormones, especially auxins, lead to an endogenous shift in the phytohormone balance responsible for the morphogenetic effect of a local NO 3 · supply.