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Shastry, S. V. S.
- Taxonomic Studies in Genus Oryza: V. sclerophyllum coarctatum (Roxb.) Griff.
Abstract Views :213 |
PDF Views:111
Authors
Affiliations
1 Division of Botany, Indian Agricultural Research Institute, New Delhi-12, IN
1 Division of Botany, Indian Agricultural Research Institute, New Delhi-12, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 8, No 1 (1966), Pagination: 42-44Abstract
The combination Sclerophyllum coarctatum (Roxb.) Griff. is invoked for the plants that have generally been known as Oryza coarctata Roxb. It is shown that the characters of Sclerophyllum Griff. generally Tall beyond the range of variation available in genus Oryza L. and hence the justification of separation.Full Text
- Taxonomic Studies in Genus Oryza L. II. some Nomenclature Confusions
Abstract Views :222 |
PDF Views:129
Authors
Affiliations
1 Indian Agricultural Research Institute, Division of Botany, New Delhi, IN
1 Indian Agricultural Research Institute, Division of Botany, New Delhi, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 6, No 2-4 (1964), Pagination: 211-218Abstract
Wild rices of Asia have been variously referred to by different workers as Oryza perennis, O. fatua, Oerufipogon, O. sativa var. fatua, O. saliva L. f. spontanea, O. balunga, O. formosana etc. Validity of each of these names and their application to the taxa are discussed and it is concluded that (i) the name O. perennis is to be discarded, (ii) valid name for perennial wild rice of Asia is O. rufipogon and (iii) annual wild rice of Asia lacks a valid name.Full Text
- Pachytene Analysis in the Genus Oryza
Abstract Views :179 |
PDF Views:107
Authors
Affiliations
1 Botanical Substation, Pusa ; Division of Botany, Indian Agricultural Research Institute, New Delhi-12, IN
1 Botanical Substation, Pusa ; Division of Botany, Indian Agricultural Research Institute, New Delhi-12, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 4, No 1-4 (1962), Pagination: 241-247Abstract
Pachytene analysis in the genus Oryza is the most fruitful line of approach to the elucidation of evolutionary problems. Cultivated species of this genus have more asymmetric karyotypes. The cell to cell variation in absolute lengths of the chromosomes in O. perennis var. barthii was shown to be due to general condensation differences and hence the data on relative lengths can be employed in the identification of the karyotype. Sterility In Japonica-indica rice hybrids is largely due to chromosome structural hybridity. Occurrence of 241 at metaphase I of the F1 hybrid O. sativa × O. officinalis is due to desynapsis rather than lack of homology between the constituent genomes. The F1 hybrid O. sativa × O. australiensis exhibits distinct timing imbalance in meiosis, the chromosomes of O. australiensis being earlier in condensation as well as migration. Pairing at pachytene is normal in the F1 hybrid O. perennis var. balunga × O. perennis var. cubensis. The F1 hybrid O. sativa × O. perennis exhibited several abnormalities in pairing at pachytene. The F1 hybird O. sativa (4x) × O. perennis var. longistalinata exhibited a high frequency of frying-pan-shaped tnvalents, indicatmg segmental homology between the genomes of the parents.Full Text