Conservation and Variation of 35S Ribosomal DNA among Five &lt;i&gt;Jatropha&lt;/i&gt; Species Revealed by Fluorescence &lt;i&gt;In Situ&lt;/i&gt; Hybridization

Muakrong, Narathid; Kikuchi, Shinichi; Tanya, Patcharin; Srinives, Peerasak

doi:10.1508/cytologia.83.57

Cited by 3 publications

(4 citation statements)

References 33 publications

(42 reference statements)

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“…integerrima have not been identified so far. FISH analyses showed two 35S rDNA locus pairs and a 5S rDNA locus pair in both species (Figs 3 and 4), consistent with previous observations [21, 22]. In this study, we found that meiotic chromosomes of the F 1 plant showed pairing between interspecific chromosomes of the same rDNA signal strength, i .…”

Section: Resultssupporting

confidence: 92%

“…FISH examination of mitotic metaphase chromosomes in five Jatropha species revealed that all except for J . integerrima showed terminal localization of 35S rDNA [22], although detection of a weak 35S rDNA signal at the end of the chromosomes of J . integerrima has been reported [21].…”

Section: Resultsmentioning

confidence: 99%

“…curcas and J . integerrima has been suggested by phylogenic analysis based on ISSR markers [4] and by FISH analysis of the number and signal intensities of rDNA [21, 22], JcSat1 might have recently evolved in J . curcas separately from J .…”

Section: Resultsmentioning

confidence: 99%

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Two jatropha karyotypes constructed from meiotic pachytene chromosomes: Pericentric distribution of heterochromatin and variation in repetitive DNAs

et al. 2018

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Jatropha (Jatropha curcas) is an oil-bearing plant used for biodiesel production. Construction of its standard karyotype and identification of the euchromatin/heterochromatin distribution associated with gene expression and meiotic recombination are essential to fully characterize its genome. Here, we developed a J. curcas karyotype based on meiotic pachytene chromosomes. In addition, a karyotype of J. integerrima, a useful species for jatropha breeding, was also constructed. Five out of eleven J. curcas chromosomes were metacentric, but only two were metacentric in J. integerrima. Almost all of the heterochromatin was distributed around the pericentric regions. The interstitial and distal regions were euchromatic without heterochromatic knobs, except for small heterochromatin regions associated with the subtelomeric repeat sequence JcSat1. These pericentric heterochromatin distribution patterns, together with chromosome structure data and the results of FISH probing with rDNA and JcSat1, allowed us to classify all chromosomes of both species. The two species had two 35S rDNA loci and one 5S rDNA locus; one 35S rDNA locus in J. integerrima was located on the interstitial region of the short arms. In addition, JcSat1 was found at only the heterochromatic ends of the J. curcas chromosome, not the J. integerrima chromosome. Despite the same chromosome number, the two pachytene chromosome-based karyotypes suggest variation in chromosome structure and distribution of repetitive DNAs in these two species.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

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Two jatropha karyotypes constructed from meiotic pachytene chromosomes: Pericentric distribution of heterochromatin and variation in repetitive DNAs

et al. 2018

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“…Flowering, which is one of the most sophisticated survival mechanisms that evolved in plants, involves meiosis, which can increase the genetic diversity of progeny through recombination due to the pairing of homologous chromosomes (Gupta et al 2017a, b, 2018a, b, Jeelani et al 2017, Kumar et al 2017, Liébana et al 2017, Rani et al 2017, Saggoo and Kaur 2017, Singhal and Kumari 2017, b, Dhaliwal et al 2018a, b, Farooq and Saggoo 2018, b, Kumari and Singhal 2018. Genetic diversity has resulted in the development of various phenotypes depending on environmental factors, and is one of the driving forces responsible for increases in the geographical distribution of certain plant species (Bordbar et al 2017, Shaker et al 2017, Shibata et al 2017, Muakrong et al 2018, Özer et al 2018, Senavongse et al 2018, Tapia-Pastrana et al 2018.…”

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confidence: 99%

Seasonal and Diurnal Regulation of Flowering <i>via</i> an Epigenetic Mechanism in <i>Arabidopsis thaliana</i>

Shibuta

Matsunaga

2019

CYTOLOGIA

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Successful plant reproduction requires the precise control of the onset of flowering, which involves the transition from the vegetative growth phase to the reproductive growth phase. As a facultative long-day annual species, Arabidopsis thaliana flowers after an exposure to low temperatures under long-day conditions. This seasonal and diurnal control of flowering involves various epigenetic regulatory activities. We herein review the mechanism underlying the relevant epigenetic regulation, with a focus on the two key flowering regulatory genes, FLOWERING LOCUS C (FLC) and FLOWERING LOCUS T (FT). The expression of FLC, which encodes a flowering repressor, is controlled via a complex epigenetic mechanism involving histone modifications and long noncoding RNAs to establish the winter memory of plants annually exposed to winter conditions. In contrast, the expression of FT, which encodes a flowering activator, is temporally regulated through the diurnal binding of polycomb group proteins to the FT promoter to ensure day-length-dependent flowering. Thus, flowering is robustly and dynamically mediated via an epigenetic mechanism to ensure it occurs at the most appropriate time.

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Differential amplification of the subtelomeric satellite DNA JcSAT1 in the genus Jatropha L. (Euphorbiaceae)

Ribeiro,

Vasconcelos,

de Mendonça Filho

et al. 2024

Genetica

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Conservation and Variation of 35S Ribosomal DNA among Five <i>Jatropha</i> Species Revealed by Fluorescence <i>In Situ</i> Hybridization

Cited by 3 publications

References 33 publications

Two jatropha karyotypes constructed from meiotic pachytene chromosomes: Pericentric distribution of heterochromatin and variation in repetitive DNAs

Two jatropha karyotypes constructed from meiotic pachytene chromosomes: Pericentric distribution of heterochromatin and variation in repetitive DNAs

Seasonal and Diurnal Regulation of Flowering <i>via</i> an Epigenetic Mechanism in <i>Arabidopsis thaliana</i>

Differential amplification of the subtelomeric satellite DNA JcSAT1 in the genus Jatropha L. (Euphorbiaceae)

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