Summary
Changes in nitrate reductase activity in response to nitrogen treatment were measured in vivo in the basipetal part of the youngest ligule emergent leaf of wheat plants during early development. The relationship between these measurements and grain yield is reported for some spring wheats grown in a growth room and some field‐grown winter wheats. In both situations the c correlation of a linear regression of yield parameters and single measurements of nitrate reductase was found to be significant. Where split dressings of nitrogen were applied the seasonal mean nitrate reductase activity correlated well with yield.
Summary
The distribution of nitrate reductase activity, as measured in vivo in the leaves of some spring wheats, was recorded. In plants grown under controlled conditions the highest activity was found in the youngest ligule emergent leaf. The acropetal part of this leaf had the highest level of activity until the leaf began to senesce. Changes in nitrate reductase activity in response to nitrate concentration in the nutrient solutions were also most pronounced in this tissue. Nitrate reductase activity in the basipetal part of the youngest ligule emergent leaf of two wheat varieties, grown at a range of nitrate levels, was followed throughout development. With a given variety the optimal nitrate concentration for development of enzyme activity was the same as that for growth, but this concentration differed between varieties.
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