1,721,002 research outputs found
Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia
No full textHassan, Walaa A., Al-Shaye, Najla A., Alghamdi, Salma, Korany, Shereen M., Iamonico, Duilio (2022): Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia. Phytotaxa 576 (2): 135-157, DOI: 10.11646/phytotaxa.576.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.576.2.
FIGURE 2 in Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia
No full textFIGURE 2. Map of Amaranthus blitum subsp. blitum var. blitum.Published as part of Hassan, Walaa A., Al-Shaye, Najla A., Alghamdi, Salma, Korany, Shereen M. & Iamonico, Duilio, 2022, Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia, pp. 135-157 in Phytotaxa 576 (2) on page 139, DOI: 10.11646/phytotaxa.576.2.1, http://zenodo.org/record/746128
Amaranthus graecizans subsp. graecizans
No full text5a. Amaranthus graecizans L. subsp. graecizans Iconography:— Beck (1909: Tab. 299, figures 1–7, sub A. angustifolius). Phenology:— Flowering time february. Habitat and elevation:— Human-made habitat (coastal plain), 5–15 m a.s.l. Chromosome number:— 2n = 32 (Baquar & Olusi 1988). Occurrence in Saudi Arabia: — Jizan. Specimina visa selecta (Fig. 4):— SAUDI ARABIA, Jizan, human-made habitat (coastal plain), 5–15 m a.s.l., 17 February 2021, leg. Masrhai et Al-shaye (PNUH), det. Masrhai, conf. Iamonico (RO!).Published as part of Hassan, Walaa A., Al-Shaye, Najla A., Alghamdi, Salma, Korany, Shereen M. & Iamonico, Duilio, 2022, Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia, pp. 135-157 in Phytotaxa 576 (2) on pages 142-143, DOI: 10.11646/phytotaxa.576.2.1, http://zenodo.org/record/746128
Amaranthus blitoides var. blitoides var. blitoides
No full text7a. Amaranthus blitoides var. blitoides Description:— See above. Iconography:— Bayón (2015: 307, Figura 21). Phenology:— Flowering time february. Habitat and elevation:— Human-made habitat (coastal plain), 5–15 m a.s.l. Chromosome number:— 2n = 32, 34. Occurrence in Saudi Arabia (Fig. 7):— Jizan (first record). Alien status:— Neophyte species native to North America, it can be considered as casual in Saudi Arabia. Specimina visa selecta:— SAUDI ARABIA. Jizan, human-made habitat (coastal plain), 5–15 m a.s.l., 17 February 2021, leg. Masrhai et Al-shaye, det. Masrhai, rev. Iamonico (PNUH!, RO!; Fig. 8); ibidem (PNUH!, RO!); ibidem (PNUH!, RO!).Published as part of Hassan, Walaa A., Al-Shaye, Najla A., Alghamdi, Salma, Korany, Shereen M. & Iamonico, Duilio, 2022, Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia, pp. 135-157 in Phytotaxa 576 (2) on page 146, DOI: 10.11646/phytotaxa.576.2.1, http://zenodo.org/record/746128
Amaranthus graecizans subsp. thellungianus Gusev
No full text5c. Amaranthus graecizans L. subsp. thellungianus (Nevski) Gusev, Bot. Zhurn. (Moscow & Leningrad) 57(5): 462. 1972 ≡ Amaranthus thellungianus Nevski, Trudy Bot. Inst. Akad. Nauk S.S.S.R., Ser. 1, Fl. Sist. Vyssh. Rast. 4: 311. 1937 Holotype:— TURKMENISTAN, In angustiis Bulak-Dara ad pedem montium Kuhitang supra pagum Karluk, 11 August 1931, Nevski 730 [LE non vidi fide Townsend (1985); photo of the isotype at K000814926!, image of the photo of the isotype available at http://apps. kew.org/herbcat/getImage.do?imageBarcode=K000814926). Chromosome number: —Not still counted. Occurrence in Saudi Arabia:— Chaudhary (1998: 238) indicated this taxon as “probably doubtful” in Saudi Arabia. No finding was done during the filed surveys. Further researches are necessary to verify the occurrence of this taxon in the country.Published as part of Hassan, Walaa A., Al-Shaye, Najla A., Alghamdi, Salma, Korany, Shereen M. & Iamonico, Duilio, 2022, Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia, pp. 135-157 in Phytotaxa 576 (2) on page 143, DOI: 10.11646/phytotaxa.576.2.1, http://zenodo.org/record/746128
Amaranthus blitum subsp. blitum var. oleraceus Hook. f.
No full text2b. Amaranthus blitum subsp. blitum var. oleraceus (L.) Hook.f., Fl. Brit. India [J.D. Hooker] 4: 721. 1885 ≡ Amaranthus oleraceus L., Sp. Pl., ed. 2. 2: 1403. 1763 ≡ Amaranthus lividus proles oleraceus (L.) Thell. in Asch. & Graebn., Syn. Mitteleur. Fl. [Ascherson & Graebner] 5(1(5)): 321. 1914 ≡ Amaranthus blitum subsp. oleraceus (L.) Costea in Costea & al., Sida 19(4): 984. 2001 Type (lectotype designated by Filias et al. 1980: 150):—ASIA. Habitat in India, Herb. Linn., No. 1117.13 (LINN!, image of the lectotype available at http://linnean-online.org/11639/). Iconography:— Bayón (2015: 307, Figura 22). Chromosome number:— Unknown. Alien status:— The origin of this taxon is uncertain at present. It probably originated from a selection of the var. blitum which was used as cultivated vegetable (see e.g., Costea et al. 2001). However, it does not appear to have been used for this purpose in Saudi Arabia. We consider var. oleraceus as casual in Saudi Arabia. Occurrence in Saudi Arabia:— Var. oleraceus is here considered since it was listed by Thomas (2011). In fact, we did not found this variety during the field survey. Further investigations need to verify its real occurrence in Saudi Arabia.Published as part of Hassan, Walaa A., Al-Shaye, Najla A., Alghamdi, Salma, Korany, Shereen M. & Iamonico, Duilio, 2022, Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia, pp. 135-157 in Phytotaxa 576 (2) on page 140, DOI: 10.11646/phytotaxa.576.2.1, http://zenodo.org/record/746128
Amaranthus graecizans subsp. sylvestris Brenan
No full text5b. Amaranthus graecizans L. subsp. sylvestris (Vill.) Brenan, Watsonia 4: 273. 1961 ≡ Amaranthus sylvestris Vill., Cat. Pl. Jard. Strasb. 111. 1807 ≡ Amaranthus sylvestris Desf. ex Poiret, Tabl. École Bot.: 44. 1804, nom. nud., nom. inval. (Art. 38.2 Ex.1 of the ICN) ≡ Amaranthus graecizans var. sylvestris (Desf.) Asch., Beitr. Fl. Aethiop.: 176. 1867, comb. illeg. ≡ Amaranthus graecizans subsp. sylvestris (Vill.) O.Bolòs & Vigo, Butl. Inst. Catalana Hist. Nat., Secc. Bot. 38(1): 89. 1974 ≡ Amaranthus angustifolius proles sylvestris (Vill.) Thell., Syn. Mitteleur. Fl. [Ascherson & Graebner] 5(1(5)): 300. 1914 ≡ Amaranthus angustifolius subsp. sylvestris (Vill.) Heukels, Geïllustreerde Schoolflora voor Nederland: 170. 1934. Type (lectotype designated by Townsend 1985: 31):— Herb. Tournefort 1849 (P!). Iconography:— Willdenow (1790: Tab. VIII, fig. 16 sub A. viridis), Bayón (2015: 329, Figura 34) Phenology:— Flowering time february. Habitat and elevation:— Human-made habitat (coastal plain), 5–15 m a.s.l. Chromosome number: —2n = 32. Occurrence in Saudi Arabia (Fig. 5): — Jizan, Makkah. Specimina visa selecta:— SAUDI ARABIA, Makkah, Jeddah, s.d., Kruijt 48 (L 1684182!); Jizan, human-made habitat (coastal plain), 5–15 m a.s.l., 17 February 2021, leg. Masrhai et Al-shaye, det. Masrhai, conf. Iamonico (PNUH!, RO!).Published as part of Hassan, Walaa A., Al-Shaye, Najla A., Alghamdi, Salma, Korany, Shereen M. & Iamonico, Duilio, 2022, Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia, pp. 135-157 in Phytotaxa 576 (2) on page 143, DOI: 10.11646/phytotaxa.576.2.1, http://zenodo.org/record/746128
Amaranthus blitum subsp. blitum var. blitum subsp. blitum var. blitum
No full text2a. Amaranthus blitum subsp. blitum var. blitum Iconography:— Beck (1909: Tab. 300). Phenology:— Flowering time february to april (see also Al-Eisawi & Al-Ruzayza 2015). Habitat and elevation:— Human-made habitat on sandy soils, 250–580 m a.s.l. (see also (Al-Eisawi & AlRuzayza 2015). Chromosome number:— 2n = 34. Alien status:— Archeophyte species native to to Mediterranean area and other parts of Europe, it can be considered as naturalized in Saudi Arabia (see also Chaudhary et al. 1981). Occurrence in Saudi Arabia (Fig. 2):— Hail (El-Ghanim et al. 2010), Makkah (Al-Eisawi & Al-Ruzayza 2015), Riyhad (our investigation). Specimina visa selecta:— SAUDIA ARABIA, Riyadh, sandy soil, 623 m a.s.l., 11 February 2021, leg. Hassan et Alali, det. Iamonico (PNUH!); ibidem (RO!).Published as part of Hassan, Walaa A., Al-Shaye, Najla A., Alghamdi, Salma, Korany, Shereen M. & Iamonico, Duilio, 2022, Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia, pp. 135-157 in Phytotaxa 576 (2) on pages 139-140, DOI: 10.11646/phytotaxa.576.2.1, http://zenodo.org/record/746128
Understanding the Active Mechanisms of Plant (Sesuvium portulacastrum L.) against Heavy Metal Toxicity
Full text linkThrough metabolic analysis, the present research seeks to reveal the defense mechanisms activated by a heavy metals-resistant plant, Sesuvium portulacastrum L. In this regard, shifting metabolisms in this plant were investigated in different heavy metals-contaminated experimental sites, which were 50, 100, 500, 1000, and 5000 m away from a man-fabricated sewage dumping lake, with a wide range of pollutant concentrations. Heavy metals contaminations in contaminated soil and their impact on mineral composition and microbial population were also investigated. The significant findings to emerge from this research were the modifications of nitrogen and carbon metabolisms in plant tissues to cope with heavy metal toxicity. Increased plant amylase enzymes activity in contaminated soils increased starch degradation to soluble sugars as a mechanism to mitigate stress impact. Furthermore, increased activity of sucrose phosphate synthase in contaminated plants led to more accumulation of sucrose. Moreover, no change in the content of sucrose hydrolyzing enzymes (vacuolar invertase and cytosolic invertase) in the contaminated sites can suggest the translocation of sucrose from shoot to root under stress. Similarly, although this study demonstrated a high level of malate in plants exposed to stress, caution must be applied in suggesting a strong link between organic acids and the activation of defense mechanisms in plants, since other key organic acids were not affected by stress. Therefore, activation of other defense mechanisms, especially antioxidant defense molecules including alpha and beta tocopherols, showed a greater role in protecting plants from heavy metals stress. Moreover, the increment in the content of some amino acids (e.g., glycine, alanine, glutamate, arginine, and ornithine) in plants under metal toxicity can be attributed to a high level of stress tolerance. Moreover, strategies in the excitation of the synthesis of the unsaturated fatty acids (oleic and palmitoleic) were involved in enhancing stress tolerance, which was unexpectedly associated with an increase in the accumulation of palmitic and stearic (saturated fatty acids). Taken together, it can be concluded that these multiple mechanisms were involved in the response to stress which may be cooperative and complementary with each other in inducing resistance to the plants
Amaranthus blitoides S. Watson, Proc. Amer. Acad. Arts
No full text7. Amaranthus blitoides S.Watson, Proc. Amer. Acad. Arts 12: 273. 1877 Type (lectotype designated by Fernald 1945: 139):— U.S.A. Iowa: Ames, gravelly or sandy soils especially around buildings and along roads, Bessey s.n. (GH00036983!, image of the lectotype available at https://kiki.huh.harvard.edu/databases/specimen_search.php? mode=details&id=58020). Description:— Herbs (0.4–)1–5 (rarely up to 10) dm tall, monoecious, annual (therophyte). Stems prostrate-ascending, glabrous (rarely sparsely pubescent), pale green to brown, branched. Leaves usually green (sometimes with a central whitish spot), oblong-lanceolate to obovate-spathulate [1.0–3.0(–4.0) × (0.3–)0.5–1.0(–1.5) cm], sometimes fleshy, with entire or undulate margins, apex acute or rounded, often mucronate, base cuneate, glabrous, with marginal white vein, petioled (petiole 0.5–1.8 cm long). Synflorescences arranged in axillary glomerules, reddish or green. Floral bracts green or greenish, ovate to lanceolate (1.3–3.0 × 0.4–0.7 mm), shorter than the longest perianth segments, acute, margin entire, glabrous. Staminate flowers with 3(–4) tepals, ovate to lanceolate; stamens 3. Pistillate flowers with (4–)5 unequal tepals, lanceolate, elliptic [the greater 1.5–2.5(–3.5) × (0.7–)1.0– 1.2 mm], with acute to acuminate, and mucronate apex; stigmas 3. Fruit brown or reddish, ellipsoidal (2.0–2.2 × 1.0– 1.4 mm), as long as or longer than the tepals, usually smooth, dehiscent. Seed lenticular (1.5–1.7 mm in diameter), black. Occurrence in Saudi Arabia:— Jizan [first record, var. blitoides (see below)], Makkah (Iamonico 2016c).Published as part of Hassan, Walaa A., Al-Shaye, Najla A., Alghamdi, Salma, Korany, Shereen M. & Iamonico, Duilio, 2022, Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia, pp. 135-157 in Phytotaxa 576 (2) on page 145, DOI: 10.11646/phytotaxa.576.2.1, http://zenodo.org/record/746128
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