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Development of a breeding strategy for Hydrangea macrophylla including interploid crossings

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2015 - 2018

In hydrangea (Hydrangea macrophylla ssp. macrophylla), diploid as well as triploid cultivars exist, however, the ploidy level is not known for all varieties and genotypes, since first results on this topic have not been published until 2000 – 2007.

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Kötterheinrich Hortensienkulturen
Lengerich
Germany

Triploid varieties are often strikingly vital and healthy. Moreover, they are fertile and can be crossed with diploid genotypes. Notwithstanding, considerable crossing barriers do exist depending on the crossing combination. It is not known, why these barriers do exist, nor how they can be overcome. Hence, the aim of the project is to analyze the inheritance of the ploidy level in interploid crossings, to investigate whether aneuploids develop, and to test their fertility. From these results, a breeding strategy including diploid and triploid varieties will be deduced.

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