scholarly journals ASSESSMENT OF F1 PROGENIES OF SWEETPOTATO (Ipomoea batatas (L.) Lam) FOR YIELD AND SUSCEPTIBILITY TO SWEETPOTATO WEEVIL (Cylas puncticollis) UNDER RAINFED CONDITION IN UMUDIKE, NIGERIA

2022 ◽  
Vol 06 (06) ◽  
pp. 92-103
Author(s):  
ULASI J. I. ◽  
RIVERS E. U
Keyword(s):  
Ipomoea Batatas ◽  
Rainfed Condition ◽  
Sweetpotato Weevil ◽  
Cylas Puncticollis

Chemical basis for resistance in sweetpotato Ipomoea batatas to the sweetpotato weevil Cylas puncticollis

2009 ◽  
Vol 81 (1) ◽  
pp. 141-151 ◽  
Author(s):  
Philip C. Stevenson ◽  
Harriet Muyinza ◽  
David R. Hall ◽  
Elaine A. Porter ◽  
Dudley I. Farman ◽  
...  
Keyword(s):  
Ipomoea Batatas ◽  
Root Surface ◽  
Resistant Variety ◽  
Liquid Chromatography Mass Spectrometry ◽  
Sweetpotato Weevil ◽  
Cylas Puncticollis ◽  
Chemical Profiles ◽  
Sub Saharan ◽  
Dose Dependent ◽  
Laboratory Bioassays

The aim of this work was to determine the basis of resistance in a sub-Saharan sweetpotato variety, New Kawogo, to the African sweetpotato weevil Cylas puncticollis. This insect feeds on the roots, reducing quality and yield, and is the most important production constraint of sweetpotato in Africa. Laboratory bioassays were designed to determine how the performance of weevils differed on susceptible and resistant roots. Subsequently, liquid chromatography-mass spectrometry (LC-MS) analysis of the root surface and root latex identified quantitative and qualitative differences in the chemical profiles with higher levels of octadecyl and hexadecyl esters of hydroxycinnamic acids reported in the resistant variety. The compounds were synthesized to confirm their identity and incorporated into artificial diets for bioassays on C. puncticollis. High levels of mortality and developmental inhibition were recorded for larvae feeding on treated diets, and the effect was dose-dependent. Thus, in contrast to previous work on resistant African sweetpotato cultivars, resistance in New Kawogo is not only active, but is quantifiable and manageable for breeding. Work is underway to determine what effect these compounds have on the weevils at a molecular level. The inheritance of the root latex esters will be studied in new crosses and mapped in new populations using quantitative trait loci (QTLs) that are currently being developed.

scholarly journals Surface Chemical Differences Between Sweetpotato Lines with Varying Levels of Resistance to the Sweetpotato Weevil

1990 ◽  
Vol 115 (4) ◽  
pp. 696-699 ◽  
Author(s):  
Ki-Cheol Son ◽  
Ray F. Severson ◽  
Richard F. Arrendale ◽  
Stanley J. Kays
Keyword(s):  
Ipomoea Batatas ◽  
Methylene Chloride ◽  
Chemical Characterization ◽  
Fused Silica ◽  
Storage Roots ◽  
Sweetpotato Weevil ◽  
Or Groups ◽  
Fused Silica Capillary ◽  
Silica Capillary Column

Methodology was developed for the extraction of surface components of sweetpotato [Ipomoea batatas (L.) Lam.] storage roots. Surface components of storage roots were quantitatively extracted with methylene chloride using 8-minute ultrasonication. After removal of the solvent, the extract was treated with 3 Tri Sil-Z:1 trimethylsilylimidazol (v/v) to convert components with hydroxyl moieties to silyl ethers and then separated on a SE-54 fused silica capillary column. Distinctly different gas chromatography profiles were found between lines displaying moderate levels of resistance (`Resisto', `Regal', `Jewel') to the sweetpotato weevil [Cylas formicarius elgantulus (summers)] and weevil-susceptible lines (`Centennial', SC 1149-19, W-115), indicating a possible role of surface components in insect response. Chromatographic fractionation techniques were developed for separation of major components or groups of components. The results will allow subsequent bioassaying for the presence of an ovipositional stimulant(s) and other weevil behavior-modulating compounds and their chemical characterization.

scholarly journals Root Carbohydrate, Organic Acids, and Phenolic Chemistry in Relation to Sweetpotato Weevil Resistance

HortScience ◽  
1991 ◽  
Vol 26 (10) ◽  
pp. 1305-1308 ◽  
Author(s):  
Ki-Cheol Son ◽  
Ray F. Severson ◽  
Maurice E. Snook ◽  
Stanley J. Kays
Keyword(s):  
Organic Acids ◽  
High Performance ◽  
Ipomoea Batatas ◽  
Water Soluble ◽  
Soluble Carbohydrate ◽  
Total Sugars ◽  
Sweetpotato Weevil ◽  
Simple Carbohydrates ◽  
Cultivar Susceptibility ◽  
Water Soluble Carbohydrate

Methanol extracts of external (outer 3 mm) and interior root tissue of four sweetpotato [Ipomoea batatas (L.) Lam.] cultivars (`Centennial', `Jewel', `Regal', and `Resisto') having different levels of susceptibility to the sweetpotato weevil [Cylas formicarius elegantulus Summer] were analyzed for simple carbohydrates (fructose, glucose, sucrose, inositol) and organic acids (malic, citric, quinic) by gas chromatography and for phenolics (caffeic acid, caffeoylquinic acids, rutin) by high-performance liquid chromatography. There were significant differences among cultivars in the concentrations of total sugars and phenolics in the external tissue (P < 0.05). In addition, the distribution of carbohydrates, organic acids, and chlorogenic acid [3-O-caffeoylquinic acid] differed between external and interior tissues. Sucrose was the major water-soluble carbohydrate in all cultivars. With the exception of malic acid, the concentration of carbohydrates, organic acids, and phenolics did not correlate with cultivar susceptibility to the sweetpotato weevil.

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