CYTOLOGICAL STUDIES ON INTERSPECIFIC HYBRIDS IN NICOTIANA INVOLVING A NEW AUSTRALIAN SPECIES, NICOTIANA AMPLEXICAULIS

Gopinath, D. M.; Krishnamurthy, K. V.; Krishnamurthy, Aparna

doi:10.1139/g65-044

Cited by 11 publications

(5 citation statements)

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“…The similarity can also be seen in the formation of multivalents, a character which is common with most hybrids. This was observed by GOPINATH (1965) on the cytological studies of the interspecific hybrids in Nicotiana which involved a New Australian species -Nicotiana anlplexicaulis. This information again confirms the works of THEL- SAUER (1957) and GRANT (1959b).…”

Section: Discussionmentioning

confidence: 84%

Meiosis, pollen morphology and perianth stomata of some taxa of Amaranthus L. (Amaranthaceae) in Nigeria

Ugborogho

Oyelana

1992

Feddes Repertorium

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The species are made up of three ploidy levels of chromosome complements with haploid number of n = 16 for the two varieties of Amaranthus hybridus, n = 17 for the two varieties of A. spinosus and A. viridis and n = 32 for A. dubius. All the species are characterised by aberrant meiosis except A. dubius. High degree of meiotic abnormalities such as multivalents and stickiness of chromosomes leads to clumping, overlapping of chromosomes and unequal segregation of chromosomes at anaphyse I. The measurements of the pollen grains showed some overlaps with the size distribution ranging from 23.52–35.28 μm. The species are highly fertile with over 85% pollen stainability except A. dubius and A. hybridus, green variety that had between 65.8% and 72% respectively. The stomata are of pericytic and anomocytic types and they showed a high degree of overlaps in their xL/xB. The high degree of overlaps in most of the micromorphological features confirms the closeness of the species and the difficulty in separating the species.

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Section: Discussionmentioning

confidence: 84%

Meiosis, pollen morphology and perianth stomata of some taxa of Amaranthus L. (Amaranthaceae) in Nigeria

Ugborogho

Oyelana

1992

Feddes Repertorium

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“…In the Nicotiana section Suaveolentes, a high degree of chromosome pairing in meiosis has been reported in several interspecific hybrids [10,22,[25][26][27][28][29][30][31][32]. Reciprocal hybrids between N. benthamiana JT and N. excelsior JT also showed a high degree of chromosome pairing, suggesting high homology of the genomes.…”

Section: Discussionmentioning

confidence: 92%

Evaluation of Crossability between Nicotiana benthamiana and Nicotiana excelsior

et al. 2021

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Wild tobacco species in the Nicotiana section Suaveolentes are promising genetic resources to introduce their disease resistance to cultivated tobacco, Nicotiana tabacum. However, hybrid lethality is observed in hybrid seedlings from crosses between most Suaveolentes species and N. tabacum. In particular, N. benthamiana belonging to the section Suaveolentes produces only viable hybrids after crossing with N. tabacum. In the present study, crossability between N. benthamiana and N. excelsior (section Suaveolentes) was investigated to test the possible usefulness of N. benthamiana as the bridge parent to transfer desirable genes of N. excelsior to N. tabacum via bridge crossing. After reciprocal crosses using three accessions of N. benthamiana and N. excelsior each, several crossing barriers such as cross-incompatibility, seed abortion, and male and female hybrid sterility were observed. Although reciprocal hybrids between N. benthamiana and N. excelsior showed a high degree of chromosome pairing in meiosis, univalents and multivalents, as well as chromosome bridges and lagging chromosomes, were observed. These meiotic abnormalities were thought to cause hybrid sterility. The possible usefulness of reciprocal hybrids between N. benthamiana and N. excelsior is discussed.

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“…Studies relating to the F1 hybrids have already been reported by Gopinath et al (1965). The two species, N. velutina and N. amplexicaulis have acute contrasting characters, the former being diminutive and slender with a trailing habit while the latter AND D. M. GOPINATH is an erect plant with stiff stem and lateral shoots directed upwards (Fig.…”

Section: Resultsmentioning

confidence: 95%

ENLARGEMENT OF THE GENUS NICOTIANA

Krishnamurthy

Gopinath

1969

The Japanese journal of genetics

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CYTOLOGICAL STUDIES ON INTERSPECIFIC HYBRIDS IN NICOTIANA INVOLVING A NEW AUSTRALIAN SPECIES, NICOTIANA AMPLEXICAULIS

Cited by 11 publications

References 0 publications

Meiosis, pollen morphology and perianth stomata of some taxa of Amaranthus L. (Amaranthaceae) in Nigeria

Meiosis, pollen morphology and perianth stomata of some taxa of Amaranthus L. (Amaranthaceae) in Nigeria

Evaluation of Crossability between Nicotiana benthamiana and Nicotiana excelsior

ENLARGEMENT OF THE GENUS <i>NICOTIANA</i>

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