Remontant Flowering Potential of Ten Hydrangea macrophylla (Thunb.) Ser. Cultivars

Adkins, Jeffrey A.; Dirr, Michael A.

doi:10.21273/hortsci.38.7.1337

Cited by 19 publications

(11 citation statements)

References 4 publications

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“…Flow cytometry analysis indicated that 'Lady in Red' and Midnight Duchess Ò are diploids, but the H. angustipetala plant has a larger genome size, indicative of a higher ploidy level (data not presented). All plants were grown outdoors under 45% shadecloth in 11.36-L containers filled with an amended pine bark substrate (Adkins and Dirr, 2003) and were overhead-irrigated as necessary.…”

Section: Methodsmentioning

confidence: 99%

Production and Verification of Hydrangea macrophylla × H. angustipetala Hybrids

Kardos¹,

Robacker²,

Dirr³

et al. 2009

horts

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The genetic diversity among H. macrophylla (Thunberg) Seringe taxa is limited as a result of the restricted native distribution and multiple breeding programs that used the same taxa and targeted similar breeding goals. This study assessed the compatibility of interspecific crosses between Hydrangea macrophylla and H. angustipetala Hayata as a source of genetic diversity. Two lacecap cultivars of H. macrophylla, ‘Lady in Red’ and Midnight Duchess® (‘HYMMAD II’), were compatible with H. angustipetala. Hybridity of progeny was confirmed by simple sequence repeat markers and morphological comparisons. Some hybrids had red- or purple-pigmented stems, which are characteristic of ‘Lady in Red’ or Midnight Duchess®, respectively. All hybrids had white lacecap inflorescences. Some of the hybrid flowers were fragrant. Winter leaf retention of the hybrids ranged from deciduous to semievergreen. Male fertility of progeny was evaluated by fluorescein diacetate staining of pollen. ‘Lady in Red’, Midnight Duchess®, and H. angustipetala had 62%, 58%, and 79% stainable pollen, respectively, whereas the ‘Lady in Red’ × H. angustipetala and Midnight Duchess® × H. angustipetala hybrids had means of 48% and 47% stainable pollen, respectively. Selected progeny were used to develop F2 and BC1 populations. The interspecific hybrids produced in this study were attractive, fertile plants that are being used in further breeding to develop new cultivars.

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Section: Methodsmentioning

confidence: 99%

Production and Verification of Hydrangea macrophylla × H. angustipetala Hybrids

Kardos¹,

Robacker²,

Dirr³

et al. 2009

horts

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“…Sepal coloration, inflorescence type, and the timing of flower bud initiation are the most important flowering traits in hydrangea. While flower color changes in hydrangea have been shown to be a result of internal detoxification of Al under low-pH conditions 5 , inflorescence type and the timing of flower bud initiation are largely under genetic control [6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

“…Remontancy is a highly desired trait for modern landscape plants, as consumers consistently choose varieties with season-long floral display and reliable blooming in more northerly or frost-prone areas 11 . Well-known remontant H. macrophylla cultivars, include "All Summer Beauty", "Bailmer" (marketed as "Endless Summer" ® ), "David Ramsey", "Decatur Blue" "Early Sensation" (marketed as "Forever and Ever" ® ), "Oakhill", and "Penny Mac" 6,7,9 . New remontant cultivars are often introduced as collections within an established brand, such as the Endless Summer ® series, Forever & Ever ® series, and Let's Dance ® series.…”

Section: Introductionmentioning

confidence: 99%

Genome-wide association studies for inflorescence type and remontancy in Hydrangea macrophylla

Wu¹,

Alexander

2020

Hortic Res

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Inflorescence type and remontancy are two valuable traits in bigleaf hydrangea (Hydrangea macrophylla L.) and both are recessively inherited. Molecular marker-assisted selection (MAS) can greatly reduce the time necessary to breed cultivars with desired traits. In this study, a genome-wide association study (GWAS) using 5803 single-nucleotide polymorphisms (SNPs) was performed using a panel of 82 bigleaf hydrangea cultivars. One SNP locus (Hy_CAPS_Inflo) associated with inflorescence type was identified with general linear model (GLM) and mixed linear model (MLM) methods that explained 65.5% and 36.1% of the phenotypic variations, respectively. Twenty-three SNPs associated with remontancy were detected in GLM whereas no SNP was detected in MLM. The SNP locus (Hy_CAPS_Inflo) was converted to a cleaved amplified polymorphic sequence (CAPS) marker that showed absolute identification accuracy (100%) of inflorescence type in a validation panel consisting of eighteen H. macrophylla cultivars. The SNP was investigated in 341 F 1 progenies using genotyping by sequencing (GBS) and co-segregated with inflorescence type (χ 2 = 0.12; P = 0.73). The SNP was subsequently used for breeding selection using kompetitive allele specific PCR (KASP) technology. Future directions for the use of genomics and MAS in hydrangea breeding improvement are discussed. The results presented in this study provide insights for further research on understanding genetic mechanisms behind inflorescence type and remontancy in H. macrophylla. The CAPS and KASP markers developed here will be immediately useful for applying MAS to accelerate breeding improvement in hydrangea.

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“…It ends with floral maturity, the growth of inflorescence axes, and the onset of flowering. The organogenesis of inflorescence is characterized by different development stages (Adkins and Dirr, 2003;Litlere and Stromme, 1975). These stages were defined to measure the effect of growing conditions on floral development and to allow us to obtain highquality horticultural plants.…”

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confidence: 99%

Architectural Development of Inflorescence in Hydrangea macrophylla cv. Hermann Dienemann

Galopin¹,

Codarin²,

Viemont³

et al. 2008

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Architectural development of inflorescence in Hydrangea macrophylla cv. Hermann Dienemann was observed using scanning electron microscopy. The study of inflorescence morphogenesis shows that the architecture is of the dichasial type. The first two orders of branching are initiated from a dichasial branching without floral differentiation. The following orders present floral differentiation. They determine the formation of small units through the development of composite dichasium into biparous and uniparous cymes. This research makes it possible to establish a schematic representation of the first phases of inflorescence development and to define early stages of inflorescence morphogenesis.

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Remontant Flowering Potential of Ten Hydrangea macrophylla (Thunb.) Ser. Cultivars

Cited by 19 publications

References 4 publications

Production and Verification of Hydrangea macrophylla × H. angustipetala Hybrids

Production and Verification of Hydrangea macrophylla × H. angustipetala Hybrids

Genome-wide association studies for inflorescence type and remontancy in Hydrangea macrophylla

Architectural Development of Inflorescence in Hydrangea macrophylla cv. Hermann Dienemann

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