TY - JOUR
AU - YOUNG, A., T.
AB - Abstract ABSTRACT Lawlor, D. W., Boyle, F. A., Keys, A. J., Kendall, A. C. and Young, A. T. 1988. Nitrate nutrition and temperature effects on wheat: a synthesis of plant growth and nitrogen uptake in relation to metabolic and physiological processes.—J. exp. Bot. 39: 329-343. Growth of spring wheat was measured in cool (13°C day/10°C night) or warm (23°C/18°C) temperatures, combined with large and small amounts of nitrate fertilizer. The rate of growth of dry matter was less at cool temperatures but total growth over the same period of development was slightly greater in the cool than in the warm. Main-shoot and tiller leaves grew slower and, despite growing for a longer period, were shorter in the cool than in the warm. They had greater fresh and dry mass and content of starch and fructosans per unit area. Cool conditions increased root dry mass, root to shoot ratio and nitrogen content in dry matter. Additional nitrate increased leaf area of main shoots slightly but of tillers greatly; it increased leaf and tiller dry matter and total plant dry mass. Additional nitrate decreased the proportion of dry matter in roots and in stems and the N content of dry matter in all plant parts. Regulation of growth by temperature, nitrate supply and the rôle of photosynthesis and nitrogen uptake, is considered in relation to the mechanisms of incorporation of carbon and nitrogen into biochemical constituents. It is concluded that temperature regulates the rate of protein synthesis, which determines plant growth rate. Nitrogen flux into the plant is not directly linked to protein synthesis so that the content of NO−3 and of amino acids is related both to growth and to conditions governing NO−3 uptake and its reduction. When nitrogen supply is large, growth is limited by temperature, not NO−3. Inadequate nitrate supply decreases protein synthesis (and therefore growth) more than it decreases carbon assimilation, so that organs such as roots and stems increase in dry matter relative to shoots and all tissues have smaller proportions of nitrogen in dry matter. Cool conditions, although decreasing the rate of protein synthesis, increase its duration and decrease the size of leaves, so that the content of protein per unit leaf area is greater in cool than in warm grown leaves. Consequences of changes in the balance of N and C supply and growth rate for dry matter distribution in plants are discussed. Wheat, nitrate nutrition, temperature This content is only available as a PDF. © Oxford University Press
TI - Nitrate Nutrition and Temperature Effects on Wheat: a Synthesis of Plant Growth and Nitrogen Uptake in Relation to Metabolic and Physiological Processes
JF - Journal of Experimental Botany
DO - 10.1093/jxb/39.3.329
DA - 1988-03-01
UR - https://www.deepdyve.com/lp/oxford-university-press/nitrate-nutrition-and-temperature-effects-on-wheat-a-synthesis-of-6ah0VLyq96
SP - 329
EP - 343
VL - 39
IS - 3
DP - DeepDyve
ER -