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

Iwaya‐Inoue, Mari; Kaku, Shosuke

doi:10.1016/0011-2240(83)90019-6

Cited by 9 publications

(5 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In all species tested, the floral primordia that did not survive freezing below -35°C was the least hardy. These data concur with the results of Iwaya-Inoue and Kaku (19). The xylem was slightly hardier than the floral buds.…”

Section: Discussionsupporting

confidence: 92%

“…These results suggest that the natural selection of freezing resistance may have occurred corresponding to climactic variation pattern. Intraspecific differences in freezing resistance among climactic races have been reported in many plants (10,19,34). These findings suggest that intraspecific differences in the hardiness Eugene Hino Crimson (Azalea)…”

Section: Discussionmentioning

confidence: 68%

“…Generally, the hardiest tissues were the vegetative buds, leaves, and cortex that survived temperatures of -50° or lower in hardy species. Rhododendron floral primordia survive low temperatures by supercooling (11,14,19,21) or extraorgan freezing (17,18,30). It was also observed that low temperature exotherms are reduced further when the flower buds acclimate or when they are cooled slowly and that the water in the floral primordia migrates to the ice formed within the bud scales via vascular system (17,18).…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Cold Hardiness in the Genus Rhododendron

Sakai

Fuchigami

Weiser

1986

J. Amer. Soc. Hort. Sci.

View full text Add to dashboard Cite

Cold hardiness of 101 Rhododendron genotypes was assessed. In hardy rhododendrons, the difference in hardiness between floral primordia and other tissues or organs was greater than in the less hardy species. All rhododendrons tested were divided into 4 hardiness divisions: very hardy, semihardy, hardy, and tender. In all hardiness divisions, the vegetative buds, leaves, and stem cortex were hardiest, whereas the floral primorida were least hardy, with a lowest survival temperature (LST) of −35°C or higher. The majority of the very hardy division of rhododendrons, such as R. brachycarpum D., R. catawbiense Michx., and R. maximum L., belong to the ponticum series. In general, rhododendrons from cold regions were hardier than those from warm regions. The hardiness of the floral primordia of rhododendrons growing near the timberline (3900 m alt.) of East Himalaya and the high altitudes of the northwestern Yunnan area were similar (−20° to −23°). These were less hardy than those found in the subalpine forests of Japan and eastern North America, probably due to moderate temperature and high humidity during the winter in eastern Himalaya and northwestern Yunnan.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Cold Hardiness in the Genus Rhododendron

Sakai

Fuchigami

Weiser

1986

J. Amer. Soc. Hort. Sci.

View full text Add to dashboard Cite

show abstract

“…(1,3,20,21), and several Rhododendron spp. (10,11,14) is similar to the number of floral primordia. However, this is not always the case.…”

mentioning

confidence: 78%

“…and cultivars (2,19,22,27). The multiple LTEs found in 'Darrow' buds are also unusual in that the primordia are not nearly as well-developed or isolated as in species with separate reproductive buds and multiple LTEs (1,3,10,11,14,20,21,24).…”

Section: Discussionmentioning

confidence: 99%

Supercooling in ‘Darrow’ Blackberry Buds

Warmund

George

Cumbie

1988

J. Amer. Soc. Hort. Sci.

View full text Add to dashboard Cite

Differential thermal analysis (DTA) experiments, viability tests, and anatomical studies were conducted to investigate the biophysics of freezing in ‘Darrow’ blackberry (Rubus spp.) buds at selected stages of development from Nov. 1985 through Sept. 1986. As many as four low-temperature exotherms (LTEs) associated with the crystallization of supercooled water were detected in DTA experiments on buds collected 16 Nov. 1985. Anatomical observations revealed seven to nine floral initials present at that date. On 16 Jan. 1986, buds were morphologically similar to those examined in November, with four to 10 LTEs per bud. By 2 Mar., the size of the floral initials increased and distinct floral parts were evident. One to 10 LTEs were observed per bud at this date. Five to seven floral initials were observed in buds collected on 23 Sept. 1986, but floral parts were not evident. DTA experiments conducted in September revealed one or no LTE per bud. The median LTEs for November, January, March, and September buds were −20.5°, −28.0°, −22.0°, and −16.5°C, respectively. T50 values calculated from viability tests were within 4.5° of the median LTEs at all test dates. These results indicate that injury to the entire floral region is associated with a single freezing event when ‘Darrow’ blackberry buds are at an early stage of development. However, as floral differentiation progresses, individual primordia supercool, freeze, and are injured independently.

show abstract

Low Temperature: Physical Aspects of Freezing in Woody Plant Xylem

George

Burke

1986

Stress Physiology and Forest Productivity

View full text Add to dashboard Cite

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

Cited by 9 publications

References 20 publications

Cold Hardiness in the Genus Rhododendron

Cold Hardiness in the Genus Rhododendron

Supercooling in ‘Darrow’ Blackberry Buds

Low Temperature: Physical Aspects of Freezing in Woody Plant Xylem

Contact Info

Product

Resources

About