ネコブセンチュウの産卵に関する研究 : 1.卵のう物質の着色硬化にともなう雌成虫の産卵力減衰

概要

論文の詳細を見る
The present paper deals with the numerical observations on the potential reproductive capacity of the root-knot nematode, Meloidogyne incognita var. acrita. Some nematologists have counted the number of eggs in an egg mass to estimate the egg productivity of the nematode. The authors suggest, however, that the number of eggs contented in an egg mass fluctuates considerably according to the degree of coloration and hardening of the gelatinous substance of the egg mass. The speed with which the gelatinous substance of the egg masses becomes to colored and hardened (this phenomena commonly occur with lapse of time from when the egg masses were produced), varies with the growth condition of the host plant and soil texture etc. The number of eggs in colored (dark brown) and hardened egg masses is, at any rate, smaller than those in light yellow and soft egg masses (Fig. 2, Table 1). In the case where sweet potato was sampled in the fall season as the host plant, the authors obtained the empirical formula of Y=-127.8+2X-0.00163X^2, where X is the number of eggs contented in an egg mass and Y is the number of eggs spawned from the female adult immersed in a physiological saline solution for 7 days at 25℃. A group around the maximum value of the above quadric equation has mostly light yellow and soft gelatinous substance of egg masses. The sum of X and Y is taken for the potential reproductivity of the nematode in a given host plant in a given season. The sum value is commonly more than one thousand, except in the case of brown colored and hardened egg masses. The female adults spawn more eggs, as a rule, in solution than then forming egg masses with the gelatinous substance. Even females with dark brown egg masses, which are considered to have suspended their egg production, spawn still more eggs in the solution. This is probably because their spawning eggs are dispersed and the egg masses are no longer formed around the vulvae, and female adults can produce more eggs from their vulvae. In order to clarify the above supposition, an experiment was performed sealing the roots with paraffin (melting point 43℃, 53℃ and 63℃) after removing the egg masses and then culturing in sand for 9 days. The experiment was carried out to test egg spawning by female adults in solution for 7 days after the treatment. With the higher melting point of paraffin, the female adults reduced their egg production in the solution. However with the shorter period of the treatment (less than three days), there was no significant difference between treatments with or without paraffin even though paraffin has a melting point of 63℃. It can be properly suggested that continued physical inhibitance of egg output of the female adults outside of their vulvae may result in the reduction of their physiological activity, and that the hardening of the gelatinous substance accompanied with coloration is, therefore, one of the factors in itself to reduce the reproductivity of females.
社団法人日本動物学会の論文
1963-08-15

ネコブセンチュウの産卵に関する研究 : 1.卵のう物質の着色硬化にともなう雌成虫の産卵力減衰

スポンサーリンク

概要

著者

関連論文

スポンサーリンク