Supercooling Ability and Cold Hardiness of Rhododendron Flower Buds With Reference to Winter Water Relations

Kaku, Shosuke; Mari, Iwaya Inoue

doi:10.1016/b978-0-12-447602-8.50031-3

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…Recommending nucleation during freezing tests, Ashworth et al (1985) hypothesized that redistribution of ice to the bud axis and scales after nucleation promoted greater supercooling in the flower buds. However, Kaku et al (1982) observed that water content of azalea bud scales did not increase nor floret water content decrease during freezing of the florets. Therefore, it is unclear whether the practice of nucleating florets during laboratory freezing creates internal moisture conditions similar to outdoor freezing.…”

Section: Methodsmentioning

confidence: 84%

“…Apparently, the prior ambient temperatures influence the degree to which the florets can supercool, a condition that depends on the ability of florets to lose water from tissues (Graham and Mullin, 1976a;Kaku et al, 1982). Both groups observed lower water content in hardier florets.…”

Section: Resultsmentioning

confidence: 99%

“…It appears that the azalea buds of species native to the eastern United States in our study had reached this hardiness stage by the first sampling dates each year, as shown by their ability to change hardiness in response to temperature. Daily mean temperatures before sampling ranged from well below the critical 0 to -2C (Hong and Sucoff, 1982;Kaku et al, 1982;Proebsting and Andrews, 1982), resulting in increased hardiness, to above the critical temperature on some late-December dates, resulting in decreased hardiness. The number of florets killed at our test temperatures showed a large range for all provenances on all test dates.…”

Section: Resultsmentioning

confidence: 99%

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Cold Hardiness of Various Provenances of Flame, Roseshell, and Swamp Azaleas

Pellett¹,

Rowan²,

Aleong³

1991

jashs

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Florets of eight provenances representing three native North American azalea species [Rhododendron calendulaceum (Michx.) Torr., R. prinophyllum (Small) Millais, and R. viscosum (L.) Torr.] being grown in Burlington, Vt., were compared during three seasons for cold hardiness by laboratory freezing during cold acclimation. There was a large variability in the number of florets killed within an inflorescence in response to freezing temperatures. Cold hardiness of florets of the three species ranked, from most to least hardy, were R. viscosum, R. prinophyllum, and R. calendulaceum. Some differences were noted in cold hardiness of florets of provenances, but these were not necessarily related to latitude or elevation of origin. Cold hardiness of most provenances showed a significant linear relationship with the daily mean temperature of the 3 days preceding freezing tests. Ambient temperatures just before subfreezing test temperatures may affect winter injury more than provenance differences for these species.

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Section: Methodsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Cold Hardiness of Various Provenances of Flame, Roseshell, and Swamp Azaleas

Pellett¹,

Rowan²,

Aleong³

1991

jashs

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“…Mullin (1976a, 1976b) reported on investigations into the relationships among cold-hardiness and low-temperature exotherms offreezing tissue. Others have reported on investigations into the supercooling ability of flower primordia (George et al 1974;Kaku et al 1982). Pellett and Holt (1981) reported on laboratory cold-hardiness limits of several evergreen rhododendron cultivars.…”

mentioning

confidence: 99%

Rhododendron Performance Evaluation in Maine

Cappiello¹

1993

horttech

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For nearly 30 years, the Univ. of Maine has been conducting woody ornamental plant performance evaluations. While there are a number of focus collections under evaluation, the Rhododendron collection is one of the central features of the program. This report offers performance data for more than 100 specimens grown at the Lyle E. Littletield Ornamentals Trial Garden on the campus of the Univ. of Maine. Winter survival, folk disease rating, fall foliage color and effectiveness, and flowering dates are included.

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Cold hardiness in various organs and tissues of Rhododendron species and the supercooling ability of flower buds as the most susceptible organ

Iwaya‐Inoue

Kaku

1983

Cryobiology

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Supercooling Ability and Cold Hardiness of Rhododendron Flower Buds With Reference to Winter Water Relations

Cited by 4 publications

References 7 publications

Cold Hardiness of Various Provenances of Flame, Roseshell, and Swamp Azaleas

Cold Hardiness of Various Provenances of Flame, Roseshell, and Swamp Azaleas

Rhododendron Performance Evaluation in Maine

Cold hardiness in various organs and tissues of Rhododendron species and the supercooling ability of flower buds as the most susceptible organ

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