Chromosome numbers of the 59 species of Eucalyptus L'Herit. (Myrtaceae)

Oudjehih, Bachir; Abdellah, Bentouati

doi:10.1080/00087114.2006.10797916

Cited by 25 publications

(14 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A large number of hardwood families and genera possess the same haploid number and have evolved at diploid level (MEHRA, 1972;KREMER et al, 2007;OHRI and KHOSHOO, 1987;AHUJA, 1990, 1991;D'EMERICO et al, 1995;ZOLDOS et al, 1999;KUMAR and RAO, 2002;WANG et al, 2005;OUDJEHIH and BENTOUATI, 2006;CHOKCHAI -CHAMNANKIT et al, 2008;RIBEIRO et al, 2011;HYNNIEWTA et al, 2011;COULLERI et al, 2012). However, a large heterogeneity of somatic chromosome numbers is exemplified by Meliaceae with 2n=16, 20, 22, 24, 26, 28, 30, 32, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 72, 78, 80, 84, 92, 100, c150, c280, c360 (STYLE and VOSA, 1971;KHOSLA and STYLES, 1975).…”

Section: Inter and Intraspecific Polyploidymentioning

confidence: 99%

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

Ohri

2015

Silvae Genetica

View full text Add to dashboard Cite

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.

show abstract

Section: Inter and Intraspecific Polyploidymentioning

confidence: 99%

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

Ohri

2015

Silvae Genetica

View full text Add to dashboard Cite

show abstract

“…In that original study by Atchison (1947), species of Psidium showed chromosome counts ranging from 2n022 to 88, strongly suggesting the occurrence of polyploidy. Twenty-three Eucalyptus species were found to have 2n022, but with two apparent aneuploid exceptions (2n024), later dismissed after observing that chromosome breaks during metaphase are commonly seen in Eucalyptus (Oudjehih and Bentouati 2006).…”

Section: Cytogenetics and Genome Sizementioning

confidence: 99%

“…Eucalypts are ideal representatives of diploids speciation with a homogeneous haploid chromosome number of n011 (2n022) based on the analysis of 135 distinct species to date. In spite of its wide ecological and morphological diversity, the genus Eucalyptus can therefore be considered as a vast karyological continuum that probably adopts a process of evolution based fundamentally on chromosome alterations (Oudjehih and Bentouati 2006). While polyploidy in Eucalyptus has not yet been observed in nature, it has been artificially induced (Janaki-Ammal and Khosla 1969), and a renewed interest in this strategy to potentially develop fast growing trees has recently emerged (Lin et al 2010).…”

Section: Cytogenetics and Genome Sizementioning

confidence: 99%

Progress in Myrtaceae genetics and genomics: Eucalyptus as the pivotal genus

Grattapaglia

Vaillancourt

Shepherd

et al. 2012

Tree Genetics & Genomes

231

188

View full text Add to dashboard Cite

“…Grains were germinated in Petri dish and then planted in small pots and allowed to grow to a proper size for chromosome counting. The Chromosome number of all lines was counted in 5 metaphase plates by minor modification of the conventional root tip squash protocol (Oudjehih and Boukaboub, 2000;Oudjehih and Bentouati 2006;Tosun, 1999).…”

Section: Cytological Investigationsmentioning

confidence: 99%

Drought Resistance and Mitotic Instability of Tritipyrum Compared with Triticale and Bread Wheat

Shahriari

Assad

Hasani

2012

Not Bot Hort Agrobot Cluj

View full text Add to dashboard Cite

This study presents the first data on the drought resistance pattern of seven new synthetic 6x primary Tritipyrum amphiploid lines and evaluates their mitotic instability. The primary Tritipyrum lines were crossed with Iranian 6x bread wheat 'Navid' cultivar and their F 1 and F 2 progenies were obtained. Two experiments with complete randomized design were conducted under optimum and limited water conditions to evaluate Tritipyrum-derived genotypes for drought resistance in greenhouse. Under optimum water conditions, grain yield, numbers of grains per spike and harvest index of Tritipyrum-derived genotypes were significantly lower than bread wheat; however the differences were not significant under limited water conditions. These results showed the better responses of Tritipyrumderived genotypes to drought conditions. Evaluation of leaf osmotic and water potentials and drought susceptibility index showed that drought resistance of Tritipyrum and F 1 genotypes was significantly higher than that of bread wheat and Triticale. Cytological investigations showed that Tritipyrum-derived genotypes aneuploidy was significantly higher than Triticale and bread wheat (p<0.05). Mitotic instability in light grains (1000-grains weight < 30 gr) was significantly higher than heavy grains (1000-grains weight > 30 gr) in parental and F 2 genotypes (p<0.01). Aneuploidy has showed a significant negative correlation with fertility, grain yield and 1000-grains weight in Tritipyrum genotypes. In general, Tritipyrum may complement the role of bread wheat in arid and semi-arid regions; but further breeding research is needed to overcome its mitotic instability.

show abstract

Chromosome numbers of the 59 species of Eucalyptus L'Herit. (Myrtaceae)

Cited by 25 publications

References 13 publications

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

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

Progress in Myrtaceae genetics and genomics: Eucalyptus as the pivotal genus

Drought Resistance and Mitotic Instability of Tritipyrum Compared with Triticale and Bread Wheat

Contact Info

Product

Resources

About