Growth and distribution of phosphorus in wheat developed under various phosphorus and temperature regimes.
1986
Batten G.D. | Aston M.J. | Wardlaw I.F.
Wheat was supplied with a complete nutrient solution containing either 1 mM phosphate to 0.25 mM phosphate. The supply of P was maintained until grain maturity, or stopped at different stages of development. Supply of P beyond anthesis resulted in more tiller dry matter and increased the P content of the grain, but did not increase grain yield at either level. With 1 mM P to maturity, up to 21 percent P of the grain P could be attributed to retranslocation of P within the plant after anthesis. With 0.25 mM P to floral initiation, 58 percent of the grain P could be attributed to such retranslocation. In another experiment plants were grown initially at 18:13 deg C with 0.25 mM P until floral initiation and thereafter with P-free solution until maturity. Higher pre-anthesis temperatures reduced the pre-anthesis growth period and the plant height, but increased the leaf phosphorus concentration and uptake of phosphorus per plant in both the pre- and post-anthesis periods. Grain P increased when the preanthesis temperature was increased, although grain yield per main culm did not vary greatly.
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