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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

High floral bud abscission and lack of open flower abscission in Dendrobium cv. Miss Teen: rapid reduction of ethylene sensitivity in the abscission zone

Kanokpon Bunya-atichart A , Saichol Ketsa A C and Wouter G. van Doorn B
+ Author Affiliations
- Author Affiliations

A Department of Horticulture, Faculty of Agriculture, Kasetsart University, Chatuchak, Bangkok 10900, Thailand.

B Wageningen University and Research Centre, PO Box 17, 6700 AA Wageningen, The Netherlands.

C Corresponding author. Email: agrsck@ku.ac.th

Functional Plant Biology 33(6) 539-546 https://doi.org/10.1071/FP05200
Submitted: 11 August 2005  Accepted: 9 March 2006   Published: 1 June 2006

Abstract

We studied the abscission of floral buds and open flowers in cut Dendrobium inflorescences. Abscission of floral buds was high and sensitive to ethylene in all cultivars studied. Many open flowers abscised in most cultivars, but cv. Willie exhibited only small amount of floral fall and cv. Miss Teen none. Applied ethylene (0.4 μL L–1 for 24 h at 27°C) greatly hastened abscission of open flowers in most cultivars, but had only a small effect in cv. Willie and no effect in cv. Miss Teen. Flower fall, if it occurred, was completely inhibited by 1-methylcyclopropene (1-MCP), showing that it was regulated by endogenous ethylene. Ethylene production from the abscission zones was low in all cultivars studied. In cv. Miss Teen the abscission zone changed from highly ethylene sensitive to completely insensitive in ~30 h, coinciding with floral opening. Removal of the floral buds somewhat reduced abscission in open flowers, but the lack of open flower abscission in cv. Miss Teen could not be explained by higher bud fall. The ovary did not grow in the (unpollinated) flowers, showing that lack of abscission in cvv. Willie and Miss Teen was not due to parthenocarpy. Flower removal in cv. Miss Teen had no effect on ethylene sensitivity of the abscission of the remaining pedicel. However, removal of the distal 2 cm of the 3-cm-long pedicels dramatically increased ethylene sensitivity. This suggests that the pedicel is important for the low ethylene insensitivity of abscission, in this cultivar. It is concluded that the abscission zones in the cvv. Willie and Miss Teen, in contrast with the other cultivars investigated, became rapidly insensitive to ethylene at the time of flower opening. At least part of the ethylene sensitivity in Miss Teen seems to be due to a factor in the pedicel.

Keywords: Dendrobium, ethylene production, ethylene sensitivity, flower abscission.


Acknowledgments

The authors acknowledge the contributions of the Thailand Research Fund and of the Postgraduate Education and Research Development Project in Postharvest Technology.


References


Aloni B, Karni L, Zaidman Z, Schaffer AA (1996) Changes of carbohydrates in pepper (Capsicum annuum L.) flowers in relations to their abscission under different shading regimes. Annals of Botany 78, 163–168.
Crossref | GoogleScholarGoogle Scholar | open url image1

Hänisch ten Cate CH, Berghoef J, van der Hoorn AMH, Bruinsma J (1975) Hormonal regulation of pedicel abscission in Begonia flower buds. Physiologia Plantarum 33, 280–284.
Crossref |
open url image1

Jaafar HZ, Atherton J, Black C, Roberts J (2000) Impact of water stress on reproductive development in sweet pepper (Capsicum annuum L.). III. Inhibition of water stress-induced ethylene production by silver thiosulphate. Journal of Tropical Agriculture and Food Science 28, 23–29. open url image1

Mayak S, Dilley DR (1976) Effect of sucrose on response of cut carnation (Dianthus caryophyllus) to kinetin, ethylene, and abscisic acid. Journal of the American Society for Horticultural Science 101, 583–585. open url image1

Roberts JA, Whitelaw CA, Gonzalez-Carranza ZH, McManus MT (2000) Cell separation processes in plants — models, mechanisms and manipulation. Annals of Botany 86, 223–235.
Crossref | GoogleScholarGoogle Scholar | open url image1

Turner AD, Wien HC (1994a) Photosynthesis, dark respiration and bud sugar concentrations in pepper cultivars differing in susceptibility to stress-induced bud abscission. Annals of Botany 73, 623–628.
Crossref | GoogleScholarGoogle Scholar | open url image1

Turner AD, Wien HC (1994b) Dry matter assimilation and partitioning in pepper cultivars differing in susceptibility to stress-induced bud and flower abscission. Annals of Botany 73, 617–622.
Crossref | GoogleScholarGoogle Scholar | open url image1

Van Doorn WG (2002) Effect of ethylene on flower abscission: a survey. Annals of Botany 89, 689–693.
Crossref | GoogleScholarGoogle Scholar | PubMed | open url image1

Van Doorn WG, Stead AD (1997) Abscission of flowers and floral parts. Journal of Experimental Botany 48, 821–837.
Crossref | GoogleScholarGoogle Scholar | open url image1

Van Meeteren U, van Gelder H (1995) Role of flower buds in flower bud abscission in Hibiscus. Acta Horticulturae 405, 284–289. open url image1

Wien HC (1990) Screening pepper cultivars for resistance to flower abscission: a comparison of techniques. HortScience 25, 1634–1636. open url image1