scholarly journals Performance of Potato (Solanum tuberosum L.) varieties Using True Potato Seed (TPS) at Gerado, Northeastern Ethiopia

2019 ◽  
Keyword(s):  
Solanum Tuberosum ◽  
Solanum Tuberosum L ◽  
Potato Seed ◽  
True Potato Seed

Synaptic mutants in potato, Solanum tuberosum L. I. Expression and identity of genes for desynapsis

Genome ◽  
1988 ◽  
Vol 30 (5) ◽  
pp. 664-670 ◽  
Author(s):  
E. Jongedijk ◽  
M. S. Ramanna
Keyword(s):  
Solanum Tuberosum ◽  
Potato Breeding ◽  
Solanum Tuberosum L ◽  
2N Gametes ◽  
Solanum Species ◽  
Potato Seed ◽  
True Potato Seed ◽  
Recessive Inheritance ◽  
Potential Value ◽  
Specific Influence

For tuber-bearing Solanum species, six monogenic recessive synaptic mutants, designated sy-1, sy-2, sy-3, sy-4, ds, and dsc have been reported in the literature. In the present investigation no indication for the existence of the mutant sy-1, affecting megasporogenesis only, was found. The mutant ds was confirmed to display typical desynaptic behaviour in microsporogenesis and shown to similarly affect megasporogenesis. It furthermore proved to be allelic to the mutants sy-3 and dsc. It is proposed that the mutants sy-3, ds, and dsc be uniformly designated ds-1, whereas the remaining mutants sy-2 and sy-4 (possibly identical) may be designated simply as synaptic mutant until their actual identity has been established. The observed F1 segregations generally support monogenic recessive inheritance of ds-1. However, in one cross progeny the expected mutant phenotype was not clearly expressed in contrast with its reciprocal, which might indicate cross-specific influence of the cytoplasm on ds-1 expression. The potential value and limitations of desynaptic (ds-1ds-1) mutants for potato breeding and true potato seed production are discussed.Key words: Solanum, (de)synaptic mutants, microsporogenesis, megasporogenesis, 2n gametes.

scholarly journals Effect of Transplanting Dates and Plant Population on Growth Parameters of Potato (Solanum Tuberosum L.) Raised from True Potato Seed (Tps)

2014 ◽  
Vol 47 (1) ◽  
pp. 97-106
Author(s):  
D. Sen ◽  
A. Rakshit ◽  
D.C. Ghosh
Keyword(s):  
Growth Rate ◽  
Growth Parameters ◽  
Solanum Tuberosum L ◽  
Plant Population ◽  
Potato Seed ◽  
True Potato Seed ◽  
Dry Matter Accumulation ◽  
Tuber Growth ◽  
Area Index ◽  
Tuber Bulking

ABSTRACT A field experiment was conducted during the rabi season of 2007- 2008 and 2008-2009 at Paschim Medinipore, West Bengal to study the effect of transplanting dates and plant population on growth parameters of potato raised from TPS. Dry matter accumulation per plant was more in early transplanted (December 3) and sparsely populated (60 cm x 15 cm) crop. The highest leaf area index was observed in early transplanted crop with closer spacing (40 cm x 10 cm) at 60 days after transplanting. The highest crop growth rate, tuber bulking rate and tuber growth rate values were also recorded in early and closely transplanted TPS crop between 45- 60 days after transplanting during both the years under investigation

Synaptic mutants in potato, Solanum tuberosum L. III. Effect of the Ds-1/ds-1 locus (desynapsis) on genetic recombination in male and female meiosis

Genome ◽  
1991 ◽  
Vol 34 (1) ◽  
pp. 121-130 ◽  
Author(s):  
E. Jongedijk ◽  
R. C. B. Hutten ◽  
J. M. A. S. A. van der Wolk ◽  
S. I. J. Schuurmans Stekhoven
Keyword(s):  
Genetic Recombination ◽  
Solanum Tuberosum L ◽  
2N Gametes ◽  
Potato Seed ◽  
Genetic Constitution ◽  
True Potato Seed ◽  
Female Meiosis ◽  
Recombination Rates ◽  
Male And Female ◽  
Tetraploid Progeny

By applying half-tetrad analysis to segregating tetraploid progeny that had been raised from 2x–4x and 2x–2x crosses, five marker loci (ym, y, Got-1, Got-2, and ds-1) were mapped to their respective centromeres in male and female meiosis of both normal synaptic and desynaptic (ds-1ds-1) diploid potato clones. Significant sex differences in genetic recombination for these loci did not occur in either normal plants or desynaptic mutants, which suggests that genetic exchange in both the sexes is governed by the same control system. In desynaptic mutants a severe reduction in crossing-over was observed for ym and.y (83.7 an 90.0% reduction, respectively), whereas recombination rates for Got-2 appeared to have systematically, although not significantly, increased. The ds-1 gene was concluded to substantially reduce the overall chiasma frequency and to differentially alter chiasma distribution along individual chromosomes. Based on segregation ratios in progeny from different types of testcrosses, first division restitution (FDR) and second division restitution (SDR) 2n gametes formed by normal synaptic plants were estimated to transmit on average about 82.7 and 36.1 %, respectively, of the parental heterozygosity to tetraploids. With desynapsis the average amount of heterozygosity transmitted by FDR 2n gametes amounted to 94.1%. SDR 2n gametes from desynaptic mutants are sterile as a result of aneuploidy. The ds-1 gene was demonstrated to particularly enhance the ability of FDR 2n gametes to preserve the genetic constitution of diploid parental clones with a minimum amount of reassortment. The potential value and limitations of the ds-1 gene for the production of true potato seed varieties and the experimental induction of diplosporic apomixis are discussed.Key words: Solanum, genetic markers, gene–centromere mapping, desynapsis, reduced recombination.

scholarly journals Correlation between Early and Late Growth Characters in an Improved True Potato Seed Population

HortScience ◽  
1992 ◽  
Vol 27 (4) ◽  
pp. 350-352 ◽  
Author(s):  
A. Golmirzaie ◽  
F. Serquen
Keyword(s):  
Solanum Tuberosum ◽  
Mature Plant ◽  
Potato Seed ◽  
True Potato Seed ◽  
Hypocotyl Length ◽  
Seedling Traits ◽  
Seed Population ◽  
Reproductive Characters ◽  
Late Growth ◽  
Growth Characters

A field experiment was conducted at two locations to determine the correlation between seedling and mature plant characters in a large potato (Solanum tuberosum) population developed for production from true potato seed. There was no significant correlation between seedling and reproductive characters, including earliness, at the two locations. Number of internodes and yield per plant were significantly correlated at Huancayo, and at San Ramon, root length and hypocotyl length had a significant correlation with the number of tubers per plant and yield per plant. Although significant, the latter correlations are not high enough to be used to predict the final behavior of genotypes by their seedling traits. Thus, it may be assumed that a certain independence between seedling and mature plant growth characters exists.

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