Changes in the content and form of magnesium in the first trifoliate leaf of subterranean clover under altered or constant root supply [Trifolium subterraneum; chlorophyll]
1990
Scott, B.J. | Robson, A.D. (Western Australia Univ., Nedlands. School of Agriculture)
In solution culture experiments, the forms of Mg in leaves could be related to the Mg concentration in leaf and were not influenced by whether the concentration in the leaf was increasing or decreasing. Chlorophyll concentration was stable at about 1 percent when the concentration of Mg in the leaf was greater than 776 microg per g. Below this Mg concentration, the concentration of chlorophyll declined rapidly. The proportion of total leaf Mg in the chlorophyll ranged from 6 percent at 5000 microg per g Mg in leaf to 35 percent at 700 microg per g. Mg associated with the residual fibre was generally 80 percent of the total tissue Mg, although this appeared to be about 60 percent when Mg concentrations in leaves were equal to or less than 1000 microg per g. When the Mg concentration in the first trifoliate leaf was below 600-800 microg per g, the leaf showed symptoms of Mg deficiency and became relatively heavier than non-deficient leaves.
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