Journal
TRANSGENIC RESEARCH
Volume 29, Issue 4, Pages 429-442Publisher
SPRINGER
DOI: 10.1007/s11248-020-00209-8
Keywords
ACC oxidase; Bud abortion; Dendrobium; Ethylene; Senescence; Transgenic
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Funding
- Center of Excellence on Agricultural Biotechnology, Science and Technology Postgraduate Education and Research Development Office, Office of Higher Education Commission, Ministry of Higher Education, Science, Research and Innovation (AG-BIO/PERDO-CHE)
- Center for Advanced Studies for Agriculture and Food, Kasetsart University Institute for Advanced Studies, Kasetsart University under the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Educati
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FourDendrobiumSonia 'Earsakul' lines were generated by insertion of one, two or three antisense copies of aCarica papayagene encoding 1-aminocyclopropane-1-carboxylic acid oxidase (CpACO). Whole vegetative plants of the transgenic lines showed about 50% of the basal ethylene production rate, while the increase in ethylene production in floral buds during opening and open flowers prior to visible senescence was delayed. Detailed analysis of more than 100 parameters in flowering plants showed no effect of antisenseACOon plant morphology and coloration, except for shorter length and width of some of the sepals and petals. In intact plants the water-soaking of floral buds as well as bud abscission were delayed byACOantisense, as was the time to senescence of open flowers. Pollen viability and pollen tube growth were not affected in the transgenic lines. In cut inflorescences placed in water, bud yellowing, bud water soaking, and bud abscission were considerably delayed by the antisense construct, while the life span of open flowers were increased and abscission of open flowers were delayed. It is concluded that the reduction of ACO activity affected the shape of some petals/sepals and delayed the abortion in floral buds, and the senescence and abscission of open flowers.
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