Senescence and grain development in wheat plants grown with contrasting phosphorus regimes
1987
Batten, G.D. (National Univ., Canberra (Australia). Dept. of Botany) | Wardlaw, I.F. (Commonwealth Scientific and Industrial Research Organization, Canberra (Australia). Div. of Plant Industry)
Wheat (Triticum aestivum L. cv. Kite) was grown in sand culture under 2 phosphorus regimes; a control, where 1 mM P solution was supplied daily until the completion of grain development, and a low-phosphorus (low-P) treatment where 0.25 mM P solution was supplied daily until 18 days after planting. Low-phosphorus plants senesced rapidly, and no photosynthetic activity was evident in the flag leaf by the time the grains were only 60 percent of their final dry weight. During grain development of low-P plants there was a decline in the flag leaf blade of the level of inorganic and lipid-bound phosphorus and a complete exhaustion of ester-P. The rate and duration of dry weight accumulated in grains of central spikelets were 23 percent lower in the low-P plants, thus reducing final grain dry weight by 40 percent. However the amount of P in the mature grain of low-P plants was reduced by 75 percent. The grains of low-P plants had negligible amounts of phytate for the first 31 days of development.
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