One of the most crucial American plant breeder important to the understanding of viburnum breeding is Dr. Don Egolf of the U.S. National Arboretum . He used by nature cross - pollinating shrubs as well as extracted seed embryo tissue culture to produce many modern genus Viburnum hybrid shrubs and cultivar . Egolf ’s investigations and longanimity provide tremendous insight into the genetic science , kinship and procedures for crossing different woody plants .
Self-Fertility
Open Pollination
" Open pollenation " refers to the natural , uncontrolled telephone exchange of pollen from genus Viburnum plant life ' flowers . wind instrument and worm are the natural vector of transplant pollen to the female flower parts called the stigmas . The resulting germ in the fruits are a random intercrossed blend of genes from whichever plant represent as the male ( pollen - supplying ) viburnum .
Taxonomic Sections
Dirr says systematist have increased savvy of genetical relationships among viburnums thanks to DNA depth psychology at the molecular level . Since the 1980s , phytologist noted that successful cross - breeding of genus Viburnum is recover among plant life within the same section . The section of genus Viburnum are aggroup mainly on the anatomical structure of the wall of the ejaculate . As of 2010 there are 12 subdivision : Lobata , Succodontotinus , Megalotinus , Tinus , Oreinodontotinus , Mollodonototinus , Opulus , Lantana , Lentago , Pseudotinue , Solenotinus and Tomentosa . Plants within each section are close genetic allies and more easy cross - pollinate to make fresh , viable hybrid plant .
Breeding Protocol
Egolf , Dirr and other woody plant breeders used much of their work with hydrangea raising to undertake cross - pollenation of viburnums . Egolf take note that viburnum shrubs that were pass over with plastic travelling bag ( and could not meet pollen from other genus Viburnum efflorescence but only from the stamen of its own flowers ) did n’t yield any fruits . control cross - pollenation was done successfully by removing the pollen - produce stamen from the flower to be pollinated . Then , a modest thicket tuck the pollen from the desire " father " bush and is smeared onto the female stigma in the prime on the " female parent " shrub ( the flower that had its stamens remove ) . A reciprocal cross between viburnum shrubs is necessary ( the mother plant also supply pollen to the female stigma of flowers on the father flora ) . Interestingly , Dirr note that in some cases of breeding , grumpy - pollination is successful in one commission but not the other .
Considerations
When attempting to cross different viburnums , the challenge of dissimilar flowering times / season can be overcome . allot to Dirr , genus Viburnum flower pollen is storable in cool location for up to six month . Or , cuttings of branches can be exposed to cooler or warm air temperatures to pull strings when flowers open and shed pollen to facilitate the hope cross - breeding attack .
References
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