水稲の稲熱病に対する抵抗性と硅酸及び苦土との関係
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概要
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Authors intended to elucidrate the effects of silica and magnesia for increasing the resistance of rice plant to Imochi disease. In this experiment, three varieties of rice plant, which has very strong, moderate and weak resistance to this disease respectively, are cultured in four different nutrient solutions, each of which is consisted of fundamental solution plus(+MgO, +SiO_2), (+MgO, -SiO_2), (-M.O, +SiO_2), (-MgO, -SiO_2). Then the plants are sprayed with a definite amounts of a suspension of the spores of Pircalaria Oryzae Cav. (the causal fungus of Imochi disease of rice plant). SiO_2 deficient series are afflicted severely with this disease, especially in the case of (-SiO_2,-MgO) and though in SiO_2 series the plants are also suffering from the disease unless MgO be given. The cause of suffering from this disease will be explained as the result of the following physiological conditions : (1) When magnesium is deficient, plants become very juicy and late ripening. Thus plants are put into the condition of being afflicted with fungus. (2) Many silica cells are found in the leaves of the plants which are cultured in (+MgO, +SiO_2)series, but only a little in the case of (-MgO, +SiO_2), (+MgO, SiO_2), (-MgO, -SiO_2) series. (3) The magnesium deficient series show the high contents of total nitrogen and the high value of N/SiO_2 ratio. (4) The total concentration of cell saps is arranged as follows : (+MgO, +SiO_2)<(+MgO, -SiO_2)<(-MgO, +SiO_2)<(-MgO, -SiO_2) And the same tendency is found in the case of the concentration of soluble nitrogen and sugar.
- 社団法人日本土壌肥料学会の論文
- 1951-03-31
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