1976 Volume 45 Issue 3 Pages 238-244
1. In order to elucidate the mechanism of gall formation caused by the root-knot nematode (Meloidogyne incognita var. acrita), an egg mass of the nematode was inoculated on the second internode of the balsam plant (Impatiens balsamina), and changes in respiration rate, carbohydrate contents and incorporation rate of assimilate were observed during gall swelling.
2. Oxygen absorption and CO2 evolution in the gall tissues slightly increased one week after inoculation and no further increases were observed until 7 weeks after inoculation when they increased markedly. Eight weeks after inoculation they became 2.5 and 3 times greater, respectively, than those in the normal tissues which had been fairly constant during the whole period of swelling.
3. The carbohydrates found in the normal and gall tissues were starch, glucose, fructose, sucrose, oxalic acid, malic acid, citric acid and iso-citric acid. In general, starch, oxalic acid, citric acid and iso-citric acid contents were higher in the gall tissues. Malic acid content in the gall tissues between 3 and 7 weeks after inoculation and reducing sugar content in the gall tissues between 1 and 5 weeks after inoculation were higher than those in the normal tissues. There was no marked difference of the sucrose content between in the normal and gall tissues.
4. Every 14C-activity incorporated into the sugar, organic acid and amino acid fractions of the gall tissues was 6 times greater than those in the normal tissues.