Cytology of Some Variegated Forms of<i>Trillium Grandiflorum</i>(Liliaceae)

Chinnappa, C. C.

doi:10.1080/00087114.1982.10796919

Cited by 2 publications

(1 citation statement)

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“…Though not a rule since meiotic irregularities have been reported in some variegated plants. A high percentage of meiotic abnormalities such as an expressive percentage of bridges and laggard chromosomes accompanied by a reduction in mean value of chiasma number per cell, as well as by a significant decrease in pollen fertility were observed in the variegated plants of Trillium grandiflorum (Chinnappa, 1982). In addition, chromosome instability, chromosome bridges at anaphases I and II were observed in variegated hybrid plants derived from Nicotiana tabacum and N. plumbaginifolia crossings (Gupta, 1968).…”

Section: Results Results Resultsmentioning

confidence: 99%

Meiotic behavior of two grapevine somatic mutants with ornamental potential

Pierozzi

Moura

2023

Not Bot Horti Agrobo

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‘Niagara Steck’ and ‘Niagara Variegada’ are two grapevine varieties that arose spontaneously as somatic mutants of ‘Niagara Rosada’. Berries characterize ‘Niagara Steck’ at young stages exhibiting a remarkable brown reticulated structure on the epidermis which develops into a brown-bronze russet-like structure as the berries ripe. The mature berries have strongly acidic flesh. ‘Niagara Variegada’ shows notable variegation in leaves and berries. Meiotic studies were carried out to ascertain if the mutant phenotypes could be related to any change in chromosome number, structure or other irregularity. Floral buds of both varieties at different developmental stages were collected and fixed for cytological analyses. Chromosome counts at diakinesis/metaphase I showed n=19 bivalents for both varieties. Univalent, trivalent, tetravalent chromosomes or chain configuration were not recorded ruling out the possibility of any alteration in the chromosome number or structure in both mutant varieties. However, low percentages of meiotic irregularities were recorded such as chromosome stickiness, laggards, non-oriented chromosomes, precocious chromosome segregation, tetrads with one microcyte, microspore fusion, and tetrad degeneration. The total percentage of abnormalities was higher in ‘Niagara Variegada’ (19.68%) than in ‘Niagara Steck’ (14.40%) which may have contributed to a lower percentage of pollen fertility (79.80%) when compared to ‘Steck’ (90.74%). The aforementioned varieties can be propagated by hardwood cuttings and constitute an interesting option for ornamentation of home backyards, patios, and gardens with the advantage that ‘Niagara Variegada’ bearing sweet edible berries.

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Section: Results Results Resultsmentioning

confidence: 99%