
TY  - JOUR
A1  - Hannachi, Lynda 
A1  - Bousser, Agnès 
A1  - Deléens, Eliane 
T1  - Effect of soil type on nitrate uptake by wheat shoots characterized using <emph type="7">15</emph>N-labelled NH<emph tye="8">4</emph> NO<emph tye="8">3</emph>-fertilizer and <emph type="2">in vitro,</emph> leaf nitrate reductase activity
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 1998
VL  - 25
IS  - 4
SP  - 465
EP  - 474
KW  - Triticum aestivum L, chalky soil, loamy soil, ammonium nitrate, 15N, nitrate reductase activity.
UR  - https://doi.org/10.1071/PP97043 
N2  - Wheat plants grown in a greenhouse in containers filled with chalky (CP) or loamy (LP) soil were fertilized with NH415NO3 or 15NH4 NO3 (5 atom% 15N), initial soil nitrate levels being lower in chalky soil. Both the total amount of nitrate and the proportion derived from fertilizer were higher in leaves of plants grown on chalky soil, however, increased inorganic N was not paralleled by a higher organic N content in the CP leaves. In vitro NR activity of the youngest fully expanded leaves confirmed that NO3 flux into the shoot was higher for CP than for LP. The ratio of the &#8216;proportion of fertilizer in the flag leaf NO3 pool divided by the proportion of fertilizer in the soil total N pool&#8217; reached a maximum (0.8) at the onset of the flag leaves for CP but decreased to 0.5 at the time of flowering because stored NO3 from fertilizer was predominantly re-used to feed other parts of the plants. In LP, NO3 was not remobilized and the ratio remained at 0.8. Higher in vitro NR activity in the CP flag leaf confirmed that release and re-use of stored nitrate occurred and that plants grown on chalky soils appear to have an enhanced ability to utilise nitrate. 
ER  -

