A Cytogenetic Study of Six Cultivars of the Chayote, Sechium edule Sw. (Cucurbitaceae)

Donato, Marcos De; Cequea, Hernán

doi:10.1093/oxfordjournals.jhered.a111444

Cited by 7 publications

(7 citation statements)

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“…The chromosome numbers of S. compositum, S. chinantlense and S. edule vary considerably; n = 14 for S. compositum, n = 15 for S. chinantlense , and there are reports of n = 13 and 14 for S. edule, which depends on the geographical zone of the samples collected (Mercado et al, 1993;De Donato and Cequea, 1994). Although these conditions may be a barrier to genetic drift and breeding between these species, in dysploidy, DNA reordering due to irregularities in the meiotic division can alter the number of chromosomes, thereby conserving the same genetic load (De Storme and Mason, 2014).…”

Section: Evolution Diversification and Breeding Of Sechium Edulementioning

confidence: 99%

“…The chromosome number of S. edule has been reported by various authors, and the results differ considerably. Mercado et al (1993) reported n = 13 for S. edule from Oaxaca; De Donato and Cequea (1994) reported n = 14 in six cultivars of S. edule. These differences may be due to a process known as dysploidy, where the number of chromosomes changes due to various mutations, but without loss or gain of DNA, which can lead to speciation events from a phylogenetic perspective (De Storme and Mason, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Phylogenetic relationships among Mexican species of the genus Sechium (Cucurbitaceae)

Barrera-Guzmán¹,

Legaria-Solano²,

Cadena-Íñiguez³

et al. 2021

Turk J Bot

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Frantzia tacaco), they are the most frequently exploited species within the genus due to their phenotypical variability, which is a product of domestication Monge and Loría, 2017).The genus Sechium was described by P. Browne to accommodate the species S. edule (Jeffrey, 1966). The genus Sechium has been grouped together with the genera Microsechium, Parasicyos, Sechiopsis, Sicyos and Sicyosperma in the subtribe Sicyinae (Lira et al., 1997). The genera Sechium and Sechiopsis have floral nectaries located at the base of the receptacle (Lira et al., 1997). The internal transcribed spacer (ITS) studies by Cross et al. (2006) indicated that S. edule, S. chinantlense and S. compositum are genetically very similar species and that the genus is paraphyletic: the Central American species of Sechium are

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Section: Evolution Diversification and Breeding Of Sechium Edulementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phylogenetic relationships among Mexican species of the genus Sechium (Cucurbitaceae)

Barrera-Guzmán¹,

Legaria-Solano²,

Cadena-Íñiguez³

et al. 2021

Turk J Bot

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“…The genetic erosion of chayote is boosted through the inbreeding and usage of cloned plants in orchids increasing the incidence of viruses and fungal plants infected [101]. The chayote holds high nutritional value with high antioxidant activity, rich in important amino acids (particularly: arginine, aspartic acid, leucine, proline among others), recently it has been pharmacologically analyzed for antimicrobial, anti-inflammatory, cardiotonic, cytotoxic and antitumor action [37]- [41]. In order to take advantage of nutritional and pharmacological properties cytogenetic analyses are proposed.…”

Section: Sechiumedule a Prominent Nucusmentioning

confidence: 99%

“…These variations in chayote would be result of isolation mechanism, aneuploid events, structural rearrangements (fusion or unequal translocation, non-disjunctions of chromosomes, among others) that provided adaptative genes [109] [110]. Different reports found an invariably small chromosome, dying problems, and clustering chromosomes because of secondary metabolites contain [37] [111]. Alternately to the wide chromosome number information available, the nuclear content and genome size of cucurbits are scarce, in the case of chayote null.…”

Section: Sechiumedule a Prominent Nucusmentioning

confidence: 99%

The Cytological Studies on Neglected and Underutilized Cucurbit Species with Special Reference to Chayote, an Under-Exploited Species

Olvera-Vazquez¹,

Cadena-Íñiguez²,

Gilani³

et al. 2019

AJPS

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Cucurbitaceae family contains important economic and medical crops, they can be divided into two categories according to the worldwide consumption, use, and production. The Cucurbit Popular Crops (CuPoC) are comprised of cucumber, the Cucurbita group (pumpkin and squash), melon and watermelon. On the other hand, Neglected and Underutilized Cucurbit Species (NU-CuS) group has been used as food sources, medicinal properties and elements in the elaboration of different types of items. The NUCuS is represented in this review work by bitter gourd, bottle gourd, chayote, ridge gourd, and snake gourd, which are recognized mainly in Asia. The center of origin of the majority of NUCuS was proposed to be in the Old World. In contrast, the origin of chayote or Sechiumedule (Jacq.) Sw. was suggested in the New World, precisely in Mesoamerican region based on linguistic uses and distribution of wild relatives. The environmental factors along with artificial selection, production systems and traditional knowledge have been influenced the evolutionary history of NUCuS, Infraspecific variation of chayote has been reported in Mexico over-described varietal groups. These descriptors were determined based on biochemical and morpho-structural traits; however, cytogenetic analyses are scarce. Specifically, chromosome and nuclear content analyses are important to support botanical groups, analyze artificial selection history, developing breeding and conservation programs. The present review paper discusses agronomic and evolutionary importance based on cytological evidence in NUCuS, mainly in the prominent chayote; with the perspective to prompt breeding, conservation, cytology, structural and functional genomics research for its sustainable utilization.

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“…Literature survey on historical background suggested that it was a monospecific genus with a single species and represented as Sechium edule (Jacq.) Sw. (Cogniaux 1881;DeDonato and Cequea 1994). Historically, genus Sechium was originally recorded from Jamaica (Browne 1756).…”

Section: Introductionmentioning

confidence: 99%

New reports of somatic chromosome number and symmetric or asymmetric karyotype estimation of Sechium edule (Jacq.) Sw. (Cucurbitaceae)

Kumar

Kiso²

2022

Caryologia

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Sechium edule (Jacq.) Sw. distributed well in Eastern Himalayan region, fourteen genotypes collected randomly from Kigwema village, Kohima (Nagaland) at an average altitude of 1538 masl (meter above sea level) with 25.61°N latitude and 94.35°E longitudes. Somatic chromosome numbers are diploid in nature. Chromosome numbers are in agreement and comparable with earlier reports except 2n=2x=22. The chromosome number 2n=2x=22 could not be traced out in the present material collected for study. Two (2) new chromosome numbers 2n=2x=32 and 2n=4x=52 were recorded and expected to be diploid and tetraploid in nature respectively. It was expected that tetraploid (2n=4x=52) number of chromosome might be originated from the earlier reports of diploid chromosome number 2n=2x=26. Both chromosome numbers 2n=2x=32 and 2n=4x=52 are reported for the first time by the authors in the present study. Range of chromosome length was recorded in between 0.501 – 1.343. The range of chromosome length are in agreement with earlier reports of 0.700 – 0.900 approximately. Range of chromosome length suggested minute (<1µm) and small (1-3µm) size of chromosomes with small differences and variations in chromosome length (CVCL). Inter-chromosomal indices (A2 and Rec), intra-chromosomal index (particularly, Stebbin’s classification) and both inter and intra chromosomal indices (DI and GI) estimated symmetric nature of the karyotype.

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A Cytogenetic Study of Six Cultivars of the Chayote, Sechium edule Sw. (Cucurbitaceae)

Cited by 7 publications

References 0 publications

Phylogenetic relationships among Mexican species of the genus Sechium (Cucurbitaceae)

Phylogenetic relationships among Mexican species of the genus Sechium (Cucurbitaceae)

The Cytological Studies on Neglected and Underutilized Cucurbit Species with Special Reference to Chayote, an Under-Exploited Species

New reports of somatic chromosome number and symmetric or asymmetric karyotype estimation of Sechium edule (Jacq.) Sw. (Cucurbitaceae)

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