I found this item and thought it might be of some interest to experimenters. It is particularly useful to know that the length of the juvenile period (time from germination to first flowers) tends to follow the seed parent in crosses between the two sections.

Karl

ISHS Acta Horticulturae 56: Symposium on Juvenility in Woody Perennials

ON THE INHERITANCE OF THE LENGTH OF THE JUVENILE PERIOD IN INTERSPECIFIC PRUNUS HYBRIDS

Author: H. Schmidt

Abstract:

A total of 3 200 interspecific hybrids within and between the 2 cherry sections Eucerasus (E) and Pseudocerasus (P) were screened for their length of juvenile period.

The E x E hybrids were the latest to flower, with P. avium and P. cerasus inheriting a longer juvenile period than P. fruticosa and P. canescens.

The P x P hybrids start to flower one year from seed with a JP50 of 1.55 years for the group. The shortest juvenile period is inherited by P. incisa 31, P. nipponica 17, and P. concinna, the longest by P. x hillieri. The E x P and P x E hybrids show a strong maternal inheritance of the length of the juvenile period. Whereas the course of flowering in the P x E group is nearly identical with the P x P hybrids, the E x P hybrids show a slight acceleration of flowering compared with the E x E group.

Adverse growing conditions in 1969 did not prevent P x P hybrids from flowering after 1 year, but prolonged the juvenile period in the E x E and E x P groups.

Schmidt, H. 1976. ON THE INHERITANCE OF THE LENGTH OF THE JUVENILE PERIOD IN INTERSPECIFIC PRUNUS HYBRIDS. Acta Hort. (ISHS) 56:229-234

http://www.actahort.org/books/56/56_26.htm