Pharmaceutical Journal, p. 324 (March 16, 1901)

CONDITIONS FOR GRAFTING

M. L. Daniel distinguishes between anatomical grafts, or grafts by approach, and grafts properly so called, which are both anatomical and physiological. The graft by approach is regarded as successful when the graft and stock unite in a durable manner, so that their separation destroys them; the graft, properly so called, is successful when the graft, developing upon the stock, produces fertile seeds. The conditions for successful grafting are extrinsic and intrinsic; the former being independent of the species grafted, the latter dependent on the specific characters. In grafting by approach, the absolutely necessary extrinsic conditions are:—(1) the maintenance of the adhesion of the plants; (2) a suitable temperature; (3) the maintenance of the vitality of the symbionts. The extrinsic conditions for successful graft, properly so called, are somewhat more complicated. The intrinsic conditions are:—(1) the mode of cicatrisation; (2) the affinity of the symbionts; and (3) analogy of properties, such as that one of the symbionts does not produce a substance poisonous to the other. The affinity to one another of the symbionts is not subject to definite laws. Two species belonging to the same genus, or two genera of the same tribe, may be more difficult to graft on one another than two species belonging to different tribes, as occurs in the Compositae and Solanaceae. This is evidently the result of the fact that the dominant characters in classification are essentially those of the reproductive organs. But resemblance in reproductive characters does not necessarily imply analogy in the vegetative apparatus; hence it may be easier to graft a species on one which differs more widely from it than on one which more closely resembles it in the characters ordinarily used for classification.Bonnier’s Rev. Gén. de Botanique, 12, 1900.

Daniel bibliography