An improved embryo-rescue protocol for a Carica interspecific hybrid

Magdalita, P. M., Adkins, S. W., Godwin, I. D. and Drew, R. A. (1996) An improved embryo-rescue protocol for a Carica interspecific hybrid. Australian Journal of Botany, 44 3: 343-353.


Author Magdalita, P. M.
Adkins, S. W.
Godwin, I. D.
Drew, R. A.
Title An improved embryo-rescue protocol for a Carica interspecific hybrid
Journal name Australian Journal of Botany   Check publisher's open access policy
ISSN 0067-1924
Publication date 1996
Sub-type Article (original research)
DOI 10.1071/BT9960343
Volume 44
Issue 3
Start page 343
End page 353
Total pages 11
Place of publication Collingwood, VIC, Australia
Publisher CSIRO
Language eng
Formatted abstract An improved embryo-rescue protocol was developed for embryos (90 days old) of Carica papaya L. (Clone 2001), and subsequently was utilised for efficient production of interspecific hybrids of C. papaya x C. cauliflora Jacq. from 90- to 120-day-old embryos. Pre-incubation of C. papaya embryos for 7 days on a germination medium containing half-strength De Fossard nutrients supplemented with gibberellic acid (10 μM), 6- benzylamino-purine (0.25 μM), α-naphthalene-acetic acid (0.25 μM), sucrose (58 mM) and agar (8 g L-1) supported 100% germination. Subsequent transfer of germinated embryos to a nutrient medium that was identical, except that it was free of plant growth regulator, allowed good growth but induced shoot etiolation and callus production. Reducing the pre-incubation of C. papaya embryos on this medium to 5 days before transfer to the medium free of plant growth regulator produced similarly high germination (96%), but allowed for the production of good quality seedlings that were unetiolated and free of unwanted callus. For interspecific hybrids, a 5-day pre-incubation of the embryos on a liquid formulation was better than the solid formulation as it promoted better growth and vigour of the normally abortive interspecific hybrid embryos. Using the improved protocol, 1981 of 2100 (94%) interspecific hybrid embryos consisting of single and multiple forms were germinated. In all cases, the germinating multiple embryos underwent further embryogenesis that allowed for the production of 485 (25%) morphologically normal hybrid plants grown in soil in the glasshouse.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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