Impact of propagation method on the growth of 10 rose shrubs of the ExplorerMC Series under natural and extreme winter conditions.

摘要

The growth of 10 rose cultivars of the ExplorerTM Series, propagated by in vitro culture, cutting and grafting on Rosa multiflora Thunb. was studied under natural and extreme winter climatic conditions in four climatic zones in Quebec. These extreme winter conditions were created using snow removal or ice application techniques. The difference in propagation methods was observed after the first two winters for plant mortality, whereas it was most apparent for final plant height and width measurements after the third and final growing season. At the end of the trial, grafted plants of Alexander McKenzie and Frontenac were shorter, Captain Samuel Holland and John Davis were taller, Alexander McKenzie and Simon Fraser were narrower and Henry Kelsey, John Davis and Louis Jolliet were broader than the plants propagated either by cuttings or in vitro culture. There were no significant differences for plant height or width for all cultivars at all evaluation sites under natural winter conditions when either propagated using in vitro or cuttings. Under natural and extreme winter conditions, variations between climatic zones for final height and width of plants indicated that for Louis Jolliet and Simon Fraser there were no differences between zones and, furthermore, plants evaluated in zones 5a and 2b were very often higher and larger than plants in other climatic zones..