Genome size variation and evolution in some species of<i>Dalbergia</i>Linn.f. (Fabaceae)

Hiremath, S. C.; Nagasampige, Manojkumar H

doi:10.1080/00087114.2004.10589418

Cited by 10 publications

(8 citation statements)

References 28 publications

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“…Ten diploid (2n = 20) species of Dalbergia show a 1.3fold variation in 4C DNA contents from 5.85 pg D. lanceolaria to 7.88 pg in D. horrida. While the tree species show a range from 5.85 pg in D. lanceolaria to 7.22 pg in D. sissoides the shrubby and climber species included in the sample show a much narrow but higher range from 7.36 pg in D. rubiginosa to 7.88 pg in D. horrida (HIREMATH and NAGASAMPIGE, 2004). In Lonchocarpus 51 diploid (2n = 22) taxa including 42 species show 4C DNA values ranging from 1.92 pg in L. santarosanus to 2.86 in L. xuul depicting a 1.49-fold difference, which does not show any correlation with altitude (PALOMINO and SOUSA, 2000).…”

Section: Genome Size Variation At Homoploid Level and By Polyploidymentioning

confidence: 87%

How small and constrained is the genome size of angiosperm woody species

Ohri

2015

Silvae Genetica

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Angiosperm hardwood species are generally considered to show an average smaller genome size with a narrow range of variation than their herbaceous counterparts. Various explanations pertaining to limitations of cell size exerted by wood fibers, the requirement of smaller stomata, longer generation time, large population size, etc., have been put forward to account for their small and constrained genome size. Yet studies done in the past several years show that genomically as well as evolutionarily, hardwoods are as diverse and active as their herbaceous counterparts. This is entirely supported by the presence of well developed inter and intraspecific polyploid series and natural triploidy in many genera. Polyploidy, in some instances has been shown to confer adaptability to arid and salt stress conditions and in colonization of new areas. Moreover, hardwoods also show reasonable amenability to the induced polyploidy which abruptly changes the balance between nuclear and cell size. Polyploidy has been induced in many hardwoods to restore fertility in interspecific hybrids and for the production of triploids.Furthermore, some cases studied show that genome size variation in hardwoods can be as variable as that of herbaceous species. Genome size has been shown to vary remarkably both at homoploid level as well as by polyploidy in certain genera. In the same way, the genome size is not correlated with the habit in certain groups having both herbaceous and woody taxa. This point is further proved by the presence of secondary and insular woody habit in certain cases where either the transition to woodiness is not followed by any diminution in the genome size, or the genome size of insular woody species may be even more than that of the congeneric herbaceous species. This shows that woody habit does not by itself put any constraints on the genome size either at homoploid or at polyploidy levels. The genome size in fact, not only varies significantly in many congeneric woody species but also may not show any correlation with the habit when woody and herbaceous species are compared in some narrow taxonomic groups studied.

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Section: Genome Size Variation At Homoploid Level and By Polyploidymentioning

confidence: 87%

How small and constrained is the genome size of angiosperm woody species

Ohri

2015

Silvae Genetica

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“…lanceolaria and D . paniculata were closely related [ 15 ]. These observations indicated that matK , nrITS , rbcL and matK+rbcL could correctly identify the reported relationships among the Dalbergia species and hence, they could most likely be successful as barcodes for this genus.…”

Section: Resultsmentioning

confidence: 99%

“…It is confined to the tropical regions of the world with Amazonia, Madagascar, Africa and Indonesia as the centers of diversity [ 13 , 14 ]. About 200 species comprise the genus, of which nearly 35 are found in India with 10–15 species in the Western Ghats (WG) alone [ 14 , 15 ]. The overall species diversity is high in WG Seven species are endemic to this region ( http://wgbis.ces.iisc.ernet.in/biodiversity/sahyadri_enews/newsletter/issue38/article/index.htm ); hence, we choose to select WG as our study area.…”

Section: Introductionmentioning

confidence: 99%

“…sissoo ) and manufacturing musical instruments ( D . melanoxylon ) [ 15 ]. Studies on tropical dry evergreen forests (TDEF) of India have indicated indiscriminate logging as one of the major factors responsible for the loss of commercial tree species, biodiversity.…”

Section: Introductionmentioning

confidence: 99%

“…The genus was included in the evolutionary study of Leguminosae [ 24 ] to analyze the relationship of Machaerium and Aeschynomene using trnL and nuclear ribosomal DNA sequences [ 25 ]. Very few studies have reported on the molecular analysis of Indian Dalbergia species [ 15 , 26 – 29 ], making it imperative to conduct studies on the genus on various aspects including phylogeny, diversity and end-use quality using DNA markers and sequence based polymorphism in suitable genomic regions.…”

Section: Introductionmentioning

confidence: 99%

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Two New Potential Barcodes to Discriminate Dalbergia Species

et al. 2015

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DNA barcoding enables precise identification of species from analysis of unique DNA sequence of a target gene. The present study was undertaken to develop barcodes for different species of the genus Dalbergia, an economically important timber plant and is widely distributed in the tropics. Ten Dalbergia species selected from the Western Ghats of India were evaluated using three regions in the plastid genome (matK, rbcL, trnH-psbA), a nuclear transcribed spacer (nrITS) and their combinations, in order to discriminate them at species level. Five criteria: (i) inter and intraspecific distances, (ii) Neighbor Joining (NJ) trees, (iii) Best Match (BM) and Best Close Match (BCM), (iv) character based rank test and (v) Wilcoxon signed rank test were used for species discrimination. Among the evaluated loci, rbcL had the highest success rate for amplification and sequencing (97.6%), followed by matK (97.0%), trnH-psbA (94.7%) and nrITS (80.5%). The inter and intraspecific distances, along with Wilcoxon signed rank test, indicated a higher divergence for nrITS. The BM and BCM approaches revealed the highest rate of correct species identification (100%) with matK, matK+rbcL and matK+trnH-psb loci. These three loci, along with nrITS, were further supported by character based identification method. Considering the overall performance of these loci and their ranking with different approaches, we suggest matK and matK+rbcL as the most suitable barcodes to unambiguously differentiate Dalbergia species. These findings will potentially be helpful in delineating the various species of Dalbergia genus, as well as other related genera.

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