Anatomical alterations due to polyploidy in cassava, Manihot esculenta Crantz

Nassar, Nagib M. A.; Graciano‐Ribeiro, Dalva; Fernandes, Sequeira; Araújo, Paulo Costa

doi:10.4238/vol7-2gmr399

Cited by 28 publications

(35 citation statements)

References 20 publications

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“…It is mainly consumed by low-income people as a staple food source in Africa and the Americas, and includes 99 species (Nassar, 2002). Studies of the vegetative and reproductive anatomical characteristics of Manihot have been conducted in the last decade, and have focused on the stem (Graciano-Ribeiro et al, 2009;Nassar et al, 2008Nassar et al, , 2010a, root (Bomfim et al, 2011a,b), egg cell (Hashimoto-Freitas and Nassar, 2013), and leaves (França et al, 2010). However, knowledge of Manihot petiole anatomy is limited.…”

Section: Introductionmentioning

confidence: 99%

Comparative petiole anatomy of cassava (Manihot) species

2016

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ABSTRACT. In this study, we describe the petiole anatomy of six wild cassava (Manihot) species, one hybrid, and two cultivars of Manihot esculenta, in order to identify their dominant anatomical patterns and relate them to possible adaptations to abiotic factors in the Cerrado biome. The median parts of several petiole samples were transversally and longitudinally sectioned and stained. The results include data for the taxonomic classification of the genus, including distinctive anatomical characteristics of hybrid varieties of cassava and wild species, such as the presence/ absence of trichomes and a hypodermis, layer type and number in the cortex, number of vascular bundles, cell types in the pith, and type of organization. Morphological analysis revealed differences in length and shape of the petiole insertion. The presence of trichomes, a hypodermis, the amount and type of supporting tissue in the cortex, as well as gelatinous fibers, may be related to drought tolerance.

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Section: Introductionmentioning

confidence: 99%

Comparative petiole anatomy of cassava (Manihot) species

2016

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“…Metcalfe and Chalk (1983) listed some genera of Euphorbiaceae that possess internal phloem, but Manihot was not included. There have been very few anatomical studies on this genus (Graciano-Ribeiro et al, 2008;Nassar et al, 2008b). We examined the anatomy of vascular bundles in Manihot because of its potential importance in the development of droughtresistant varieties.…”

Section: Introductionmentioning

confidence: 99%

Internal phloem in an interspecific hybrid of cassava, an indicator of breeding value for drought resistance

Graciano‐Ribeiro

Hashimoto²,

Nogueira³

et al. 2009

Genet. Mol. Res.

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ABSTRACT. We examined the stem anatomy of Manihot esculenta Crantz and its hybrid with M. oligantha Pax. Cross-sections were stained with safranin-alcian blue. Manihot esculenta and its hybrid were found to have the same vascular structure in bicollateral bundles with internal phloem, which has been associated with drought resistance in other plant groups. If this association is established for cassava, it would facilitate the selection of lines that are more adapted to arid regions. This is the first report of internal phloem in this genus.

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“…A genetic alteration due to colchicine treatment was reported by Nassar et al (2008) who studied anatomical alterations in the cassava plant. They found that the tetraploid type showed more prismatic and druse crystals in the cortical parenchyma, and its pericycle fibers had thicker walls.…”

Section: Discussionmentioning

confidence: 94%

Mutagenic influences of colchicine on phenological and molecular diversity of Calendula officinalis L.

El-Nashar¹,

Ammar²

2016

Genet. Mol. Res.

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ABSTRACT. Six different colchicine concentrations: 0, 400, 800, 1200, 1600, and 2000 ppm, in combination with four soaking time treatments (1, 2, 3, and 4 h), were selected to assess the effects on germination, vegetative growth, and flower yield components in calendula plants. The molecular diversity among the treatments was assessed using ten SRAP marker combinations. Seed soaking in colchicine significantly enhanced both the fresh and the dry shoot and root masses, flowering date, number of flowers per plant, and flower diameter. At 1200-ppm colchicine combined with a 4-h soaking time, a superior effect on seed germination was observed, whereas 800 ppm for 4 h produced the highest number of flowers and the largest flower diameter. The earliest flowering time was found at 800 ppm combined with a short soaking time (1 h), while the 4-h soaking time with 800 ppm, is recommended for growing calendula outdoors, since it enhances flower development. At the molecular level, 752 fragments were successfully amplified

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Anatomical alterations due to polyploidy in cassava, Manihot esculenta Crantz

Cited by 28 publications

References 20 publications

Comparative petiole anatomy of cassava (Manihot) species

Comparative petiole anatomy of cassava (Manihot) species

Internal phloem in an interspecific hybrid of cassava, an indicator of breeding value for drought resistance

Mutagenic influences of colchicine on phenological and molecular diversity of Calendula officinalis L.

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