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| Riproduzione in vitro http://www.giros.it/forum/viewtopic.php?f=78&t=2264 |
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| Autore: | Luca Oddone [ 27 dicembre 2013, 23:15 ] |
| Oggetto del messaggio: | Riproduzione in vitro |
Interessante sito sulla riproduzione in vitro delle orchidee. Certi ibridi ottenuti in laboratorio ci mostrano quanto grande possa essere la variabilità delle Ophrys! A very interesting observation is that it seems to be the pollen of the F1 hybrid that is defective. If pollen from a true species is used to fertilise a hybrid, then “new” hybrids develop some of them are sufficiently viable to grow to flowering size in soil. In this way, more and more species can be “added” to a new hybrid. In some of these generation, just rather few plants can be raised, but in next maybe several more seeds are viable. We have several vital Ophrys insectifera × tenthredinifera × speculum × cretica × holosericea × spruneri in soil in this moment (winter 2008). Whilst F1 hybrids appear to be very similar to their brothers and sisters, hybrids containing three or more different species, on the contrary, are very different from one another, not two single plants from the same seed pot of the crossing are alike. Not even two plants (of 20-25) produced similar flowers in the crossing Ophrys lutea × tenthredinifera × cretica × holoserica that bloomed in March 2006! As Ophrys hybrids almost always are sterile – with own pollen – this seems to indicate that “new” Ophrys species do not develop from hybridizing in nature! Common genetic variation and common Darwinistic selection might produce “new” species, as usual. Also, raising a number of plants from a single, self-pollinated seed capsule will illustrate the very big variation in markings and form of the flower within a single species. And these individual variations are not very genetically stable, so it will take many, many generations to produce a “new” species. Most of the “new” Ophrys species recently described, are just natural variations and probably not even genetically stable! http://www.lidaforsgarden.com/Orchids/ophrys_eng.htm Buone feste a tutti! |
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