Neoraudiol, a new isoflavonoid and other antimicrobial constituents from the tuberous root of Neorautanenia mitis (A. Rich) Verdcourt

ABSTRACT Allelopathy contributes to the sustainable management of weeds in growing areas, due to its ability to inhibit the development of weed species. This study aimed to evaluate the allelopathic effect of Pachyrhizus erosus extract on Euphorbia heterophylla and Bidens pilosa germination. The experiment was carried out in a completely randomized design, in a 2 x 2 x 4 factorial scheme, with four replications. The first factor corresponded to the plant portion (shoot and tuberous root), the second to the extract preparation method (water at room temperature and boiling) and the third to the extract concentrations (0 %, 25 %, 50 % and 100 %). Phytochemical analyses were performed to identify the presence of secondary metabolites. The variables germination percentage, germination rate index and dry biomass decreased with increasing aqueous extract concentrations for both E. heterophylla and B. pilosa. When applied a P. erosus crude shoot extract (boiling), decreases of 18 % and 92 % were observed in the E. heterophylla and B. pilosa germination, respectively, with a decrease of 91 % in the dry biomass of E. heterophylla seedlings. The tuberous root extract (boiling), on the other hand, reduced the germination percentages for E. heterophylla and B. pilosa in 18 % and 80 %, respectively. The phytochemical evaluation indicated the presence of flavonoids, coumarins and saponins in the shoot and tuberous root extracts, while tannins were only observed in the shoot extract. Thus, it can be concluded that P. erosus extracts display an allelopathic effect on the weed species evaluated.

Download Full-text

Seleção de genótipos de batata-doce quanto à eficiência ao uso do fósforo em solos da região de cerrado

Journal of Biotechnology and Biodiversity ◽

10.20873/jbb.uft.cemaf.v4n4.silva ◽

2013 ◽

Vol 4 (4) ◽

pp. 356-364

Author(s):

Luziano Lopes Da Silva ◽

Márcio Antônio Da Silveira ◽

Rodrigo Ribeiro Fidelis ◽

Rodrigo de Castro Tavares ◽

Valéria Gomes Momenté ◽

...

Keyword(s):

Experimental Design ◽

Sweet Potato ◽

Ipomoea Batatas ◽

Block Design ◽

Tuberous Root ◽

Phosphorus Fertilization ◽

Germplasm Bank ◽

Randomized Block Design ◽

The Family ◽

Selection Of

The sweet potato (Ipomoea batatas (l.) Lam.) Lam) is a plant that produces tuberous root belonging to the family convolvulácea explored in practically all states of Brazil. The objective of this work was to select genotypes of the sweet potato as the efficiency of phosphorus use in cerrado soils with high and low availability of this nutrient. Were evaluated nine genotypes of sweet potato coming from the germplasm bank from the Federal University of the Tocantins, Brazil. The experimental design was in randomized block design with three replications being nine genotypes grown in two environments with low and high phosphorus availability, using doses of phosphorus fertilization from 20 and 120 kg ha-1 P2O5, applied at planting. To select genotypes suitable for environments proposed was used methodology for selection of the efficient use and response to phosphorus fertilization (efficiency and response). Genotype Amanda was classified as efficient and responsive, Barbara, Julia, Marcela and Carolina Vitoria as efficient, but not responsive and Livia, Duda, Ana Clara and Beatriz were classified as non-efficient, responsive but the absorption and utilization of phosphorus.

Download Full-text

Tuberous Root Initiation and Shoot Regeneration in Telfairia occidentalis Hook. F.

IOSR Journal of Pharmacy and Biological Sciences ◽

10.9790/3008-1203070613 ◽

2017 ◽

Vol 12 (03) ◽

pp. 06-13

Author(s):

Ayobola Moninuola Sakpere ◽

Idowu Arinola Obisesan

Keyword(s):

Shoot Regeneration ◽

Tuberous Root ◽

Root Initiation ◽

Telfairia Occidentalis

Download Full-text

tuberous root [n]

Encyclopedic Dictionary of Landscape and Urban Planning ◽

10.1007/978-3-540-76435-9_15313 ◽

2010 ◽

pp. 1061-1061

Keyword(s):

Tuberous Root

Download Full-text

Cell Structure, Water Status and Starch Properties in Tuberous Root Tissue in Relation to the Texture of Steamed Sweetpotato (Ipomoea batatas (L.) Lam)

Japanese Journal of Crop Science ◽

10.1626/jcs.79.284 ◽

2010 ◽

Vol 79 (3) ◽

pp. 284-295 ◽

Cited By ~ 5

Author(s):

Yoshiyuki Nakamura ◽

Toshikazu Kuranouchi ◽

Akiko Ohara-Takada ◽

Nobuaki Ishida ◽

Ichie Koda ◽

...

Keyword(s):

Ipomoea Batatas ◽

Water Status ◽

Cell Structure ◽

Tuberous Root ◽

Root Tissue ◽

Starch Properties ◽

Structure Water

Download Full-text

Vegetative propagation in Rhexia virginica (Melastomataceae): some morphological and ecological considerations

Canadian Journal of Botany ◽

10.1139/b84-288 ◽

1984 ◽

Vol 62 (10) ◽

pp. 2118-2121 ◽

Cited By ~ 4

Author(s):

U. Posluszny ◽

M. J. Sharp ◽

P. A. Keddy

Keyword(s):

Vegetative Propagation ◽

Tuberous Root ◽

External Morphology ◽

Histological Techniques ◽

Tuberous Roots ◽

Root Buds

The unusual method of vegetative propagation in the rare shoreline plant Rhexia virginica L. was studied using both histological techniques and observations of the external morphology. Several propagules in the form of swollen tuberouslike roots develop adventitiously early in the spring. As the tuberous root forms its periderm, shedding the cortex and epidermis, a number of root buds develop in the region of the phellogen. Approximately two to four root buds per propagule develop as aerial shoots. The rest of the root buds and the tuberous roots themselves degenerate. There was no evidence of propagules and viable root buds surviving for several years, as previously reported. The inability of the tuberous roots to survive in soil for more than a single year may explain, to some extent, why R. virginica is rare in Ontario.

Download Full-text