Environmental and biotic factors affecting the phenolic content of different cultivars ofSorghum bicolor

1981 ◽  
Vol 7 (6) ◽  
pp. 1035-1047 ◽  
Author(s):  
Susan Woodhead
Keyword(s):  
Phenolic Content ◽  
Biotic Factors ◽  
Factors Affecting

Abiotic and biotic factors affecting crop seed germination and seedling emergence: a conceptual framework

2018 ◽  
Vol 432 (1-2) ◽  
pp. 1-28 ◽  
Author(s):  
Jay Ram Lamichhane ◽  
Philippe Debaeke ◽  
Christian Steinberg ◽  
Ming Pei You ◽  
Martin J. Barbetti ◽  
...  
Keyword(s):  
Seed Germination ◽  
Conceptual Framework ◽  
Seedling Emergence ◽  
Biotic Factors ◽  
Factors Affecting ◽  
Abiotic And Biotic Factors ◽  
Crop Seed

scholarly journals Optimization of Polyphenol Extraction from Allium ampeloprasum var. porrum through Response Surface Methodology

Foods ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 162 ◽  
Author(s):  
Irini Strati ◽  
George Kostomitsopoulos ◽  
Fotios Lytras ◽  
Panagiotis Zoumpoulakis ◽  
Charalampos Proestos ◽  
...  
Keyword(s):  
Total Phenolic Content ◽  
Plant Material ◽  
Phenolic Content ◽  
Solvent Mixture ◽  
Extraction Time ◽  
Total Phenolic ◽  
Leaf Extracts ◽  
Factors Affecting ◽  
Allium Ampeloprasum ◽  
Mediterranean Countries

Allium ampeloprasum var. porrum has been recognized as a rich source of secondary metabolites, including phenolic acids, flavonoids and flavonoid polymers (proanthocyanidins or condensed tannins), with related health benefits. Both parts of Allium ampeloprasum var. porrum (white bulb and pseudostem) are traditionally consumed either as a vegetable or as a condiment in many Mediterranean countries. The aim of the present study was to optimize the extraction conditions of polyphenols from white leek stem and green leek leaf by implementing a Box-Behnken design (BBD). The optimization considered basic factors affecting extraction efficiency, including extraction time, solvent to plant material ratio and solvent mixture composition. Maximum polyphenol yield was achieved at an extraction time of 80 and 100 min for white leek stem and green leek leaf extracts respectively, solvent to plant material ratio of 5:1 (v/w) and methanol to water ratio of 40:60 (v/v), for both leek extracts. Interestingly, higher total phenolic content was found in green leek leaf extracts compared to white leek stem extracts, due to a possible relationship between polyphenol production and sunlight radiation. High correlation values were also observed between total phenolic content and antioxidant-antiradical activity of optimized leek extracts.

Abiotic and Biotic Factors Affecting the Ingestion Rates of Mixotrophic Nanoflagellates (Haptophyta)

2018 ◽  
Vol 77 (3) ◽  
pp. 607-615 ◽  
Author(s):  
Ya-Fan Chan ◽  
Kuo-Ping Chiang ◽  
Yun Ku ◽  
Gwo-Ching Gong
Keyword(s):  
Biotic Factors ◽  
Ingestion Rates ◽  
Factors Affecting ◽  
Abiotic And Biotic Factors

scholarly journals PHENOLIC VARIATION IN LEAF POSITION IN APPLE

HortScience ◽  
1995 ◽  
Vol 30 (3) ◽  
pp. 437c-437
Author(s):  
M.E. Garcia ◽  
R.C. Rom ◽  
J.B. Murphy ◽  
G.W. Felton
Keyword(s):  
Caffeic Acid ◽  
Spectrophotometric Method ◽  
Phenolic Content ◽  
Leaf Position ◽  
Current Season ◽  
Factors Affecting ◽  
Apple Cultivars ◽  
Basal Portion ◽  
Tip Position ◽  
Insect Interactions

The foliar phenolic content of 21 apple cultivars was evaluated. Ten leaves were sampled randomly from three positions on current-season terminal shoots. Shoots were divided as tip, middle, and basal positions. The phenolic content was determined by spectrophotometric method (390 nm) using diphenylboric acid 2-aminoethyl ester as the reagent and caffeic acid as standard. Cultivars varied significantly in phenolic content. `Stark Ultra Red' had the highest amount, and `Liberty' had the lowest amount. Significant variations in the phenolic content due to leaf position were observed. Phenolic content was highest in leaves from the tip position, and it decreased toward the basal portion of the shoot. Factors affecting the phenolic content of apple cultivars will be investigated to determine apple × insect interactions.

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