Genetic Studies on Cassia Occidentalis Linn.
Cassia occidentalis is a compound-leaved, mono-capellary, woody shrub of waste places. Its other accession, Cassia sp. is a simple-leaved, multi-capellary, woody shrub also inhabiting waste places but with a more restricted distribution. It is an unusual Cassia plant since multi-capellary condition...
Sábháilte in:
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| Rannpháirtithe: | |
| Formáid: | Tráchtas |
| Teanga: | Béarla |
| Foilsithe / Cruthaithe: |
Obafemi Awolowo University
2014
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| Ábhair: | |
| Rochtain ar líne: | http://localhost:8080/xmlui/handle/123456789/3422 |
| Clibeanna: |
Cuir clib leis
Níl clibeanna ann, Bí ar an gcéad duine le clib a chur leis an taifead seo!
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| Achoimre: | Cassia occidentalis is a compound-leaved, mono-capellary, woody shrub of waste places. Its other accession, Cassia sp. is a simple-leaved, multi-capellary, woody shrub also inhabiting waste places but with a more restricted distribution. It is an unusual Cassia plant since multi-capellary condition and the simple leaf form are unusual and apparently unrecorded for the genus.
Genetic studies showed both plants to be closely related and to produce a fertile hybrid. The mode of inheritance of leaf form and carpel number was observed to be monogenic, the simple-leaved multi-capellary condition being recessive to the compound-leaved, mono-capellary condition.
Anatomical studies on transverse sections through the petiole of the different leaf types encountered in the two accessions, revealed an evolutionary progression which was interpreted as a progression from the simple leaf form to the compound leaf form. The possibility of Cassia sp. originating from C. occidentalis as a result of simple mutational events was suggested.
A simple event of hybridization between the two Cassia accessions can create considerable confusion for taxonomic work. For this reason, giving so much weight to the simple-leaf/compound-leaf and one carpe l/ many-carpel dichotomies in suprageneric plant classification deserves considerable caution. |
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