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Effect of leaf and stem rust on the phosphorus metabolism of hard red spring wheat

Effect of leaf and stem rust on the phosphorus metabolism of hard red spring wheat

Cereal Chem 23(1): 52-64

The effect of leaf and stem rust upon the translocation of P into the developing kernel and on the chem. composition of the resulting grain was studied. Total P detns. were made on 3 plant fractions, grain, chaff, and straw, prepd. from tillers harvested during kernel filling from plots of Thatcher and Marquis wheats variously infected with leaf and stem rust, respectively. The leaf and stem rust epidemics were induced by artificial inoculations and natural infection was controlled by periodic sulfur dustings. Mean kernel wts. and moisture contents of the entire tiller were used as indices of progressing maturity. Severe leaf rust infection, as that of stem rust, adversely affected kernel wt. Transpiration rate was accelerated more by stem rust than by leaf rust. There appeared no consistent difference in the % of P (dry matter basis) in the kernels with progressive maturity; it showed a downward trend in the chaff; and had markedly decreased in the straw. Total P of the entire aerial portion of the tiller remained relatively constant throughout maturation, but the P was translocated from the straw and chaff into the developing kernel. The translocation of P exceeded that of the other ash constituents. The conc. of P was slightly greater in severely rusted plants than in lightly infected plants during the early stages of kernel development, but the differences decreased with maturity. Severe rust infection greatly lowered the total P content of the entire tiller of the wheat plant and markedly interfered with its translocation into the kernels.

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