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| Content Provider | Springer Nature Link |
|---|---|
| Author | Pescador, Rosete Kerbauy, Gilberto Barbante Melo Ferreira, Wagner Purgatto, Eduardo Suzuki, Rogério Mamoru Guerra, Miguel Pedro |
| Copyright Year | 2012 |
| Abstract | Endogenous levels of IAA, ABA and four types of CKs were analyzed in zygotic and indirect (ISE) and direct somatic embryogenesis of Acca sellowiana. Zygotic and somatic embryos at different developmental stages were sampled for morphological and hormonal analysis. Both embryo types showed substantial asymmetry in hormone levels. Zygotic embryos displayed a conspicuous peak of IAA in early developmental stages. The results outlined the hormonal variations occurring during zygotic and somatic embryogenesis regarding the timing, nature and hormonal status involved in both processes. The short transient pulse of IAA observed on the 3rd day in culture was suggested to be involved with the signaling for the induction of somatic embryogenesis. Fertilized ovule development was associated with increased IAA levels 21–24 days after pollination, followed by a sharp decrease in the cotyledonary stage, both in zygotic and somatic embryos. There was a prominent increase in ABA levels in cultures which generated ISE 24–30 days after pollination, a period that corresponds to the heart and torpedo stages. The levels of total CKs (Z, [9R]Z, iP and [9R]iP) were also always higher in zygotic than in somatic embryogenesis. While zygotic embryogenesis was dominated by the presence of zeatin, the somatic process, contrarily, was characterized by a large variation of the other cytokinin forms and amounts studied. The above results, when taken together, could be related to the previously observed high frequency formation of anomalous somatic embryos formed in A. sellowiana, as well as to their low germination ability. |
| Starting Page | 67 |
| Ending Page | 76 |
| Page Count | 10 |
| File Format | |
| ISSN | 01676903 |
| Journal | Plant Growth Regulation |
| Volume Number | 68 |
| Issue Number | 1 |
| e-ISSN | 15735087 |
| Language | English |
| Publisher | Springer Netherlands |
| Publisher Date | 2012-04-17 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Acca sellowiana Somatic embryogenesis Zygotic embryogenesis Hormone Plant Physiology Agriculture Plant Anatomy/Development Plant Sciences |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Plant Science Agronomy and Crop Science |
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