Chilling Requirement for Dormancy Release of Variegated Solomon's Seal

• Published in: Horticulture, environment and biotechnology Vol. 52; no. 6; pp. 553 - 558
• Main Authors: Yun, N.Y., Seoul National University, Seoul, Republic of Korea, Rhie, Y.H., Seoul National University, Seoul, Republic of Korea, Jung, H.H., Seoul National University, Seoul, Republic of Korea, Kim, K.S., Seoul National University, Seoul, Republic of Korea
• Format: Journal Article
• Language: English
• Published: Korea Korean Society for Horticulture and Science 01.12.2011; 한국원예학회
• Subjects: Agriculture; Biomedical and Life Sciences; chill unit; COLD; DORMANCY BREAKING; emergence uniformity; forcing date; FRIO; FROID; LEVEE DE DORMANCE; Life Sciences; Plant Breeding/Biotechnology; Plant Ecology; Plant Physiology; Polygonatum odoratum Druce var. pluriflorum Ohwi for. variegatum Y.N.Lee; Research Report; SALIDA DE LA LATENCIA; 농학; dormancy breaking; chill unit; Ohwi for; Druce var; emergence uniformity; forcing date; low temperature; Y.N.Lee
• ISSN: 2211-3452; 2211-3460
• DOI: 10.1007/s13580-011-0032-9

Dormancy release of variegated Solomon's seal (Polygonatum odoratum Druce var. pluriflorum Ohwi for. variegatum Y.N.Lee) was studied by varying the transferring date from the field to greenhouse and by cold storage in order to identify their precise chilling requirement. Bud emergence and flowering did not occur throughout the experiment when dormant rhizomes were transferred until a calendar date November 22, 2009, in which natural cumulative chill unit (NCU) was 75 h. Days to sprouting, flowering, and flower abscission were shortened with delayed transferring dates. Percent sprouting and flowering showed an increasing tendency since rhizomes were transferred on December 7 (= 241 h NCU), but emergence date was not uniform. However, uniform percent sprouting was maintained since rhizomes were transferred on December 22 (= 492 h NCU). No or 1 week of cold storage at 0 or 5℃ did not induce sprouting, which meant bud dormancy was not released when rhizomes were stored less-than or equal to 1 week. When they were stored for more 2 weeks at 0 or 5℃, percent sprouting was increased to greater-than or equal to 91% in the heated greenhouse. Cumulative chill unit (CCU) was 336 h at 0℃ and 225 h at 5℃. However, bud emergence date after 2 weeks of cold storage was not uniform at both storage temperatures, whereas bud emergence after 4 weeks of cold storage at 0℃ was more uniform than that at 5℃. Therefore, at least 492 h NCU, 4 weeks of cold storage at 0℃ (= 672 h CCU), or 6 weeks at 5℃ (= 675 h CCU) is recommended for forcing and normal growth afterward of variegated Solomon's seal.