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35 results on '"LaBonte, Don R."'

13. Genotype X Environment Interactions for East African Orange-Fleshed Sweetpotato Clones Evaluated across Varying Ecogeographic Conditions in Uganda.

Author

Tumwegamire, Silver, Rubaihayo, Patrick R., Grüneberg, Wolfgang J., LaBonte, Don R., Mwanga, Robert O. M., and Kapinga, Regina

Subjects
GENOTYPE-environment interaction, SWEET potato genetics, ENVIRONMENTAL geography, PLANT root physiology
Abstract

African dry and starchy (DS) orange-fleshed sweetpotato [Ipomoea batatas (L.) Lam] (OFSP) cultivars, distinct from American moist or medium dry and sweet OFSP, have potential to fight vitamin A deficiency (VAD) in the world. This study assessed the genotype X environment (G X E) interactions in multienvironment trials (METs), the genetic correlations for total root yield (TYLD), biomass (BIOM), harvest index (HI), root dry matter (RDM), root starch (RST), root sucrose (RSU), root β-carotene, (RBC), root Fe (RFE), root Zn (RZN), root Ca (RCA), and root Mg (RMG) and the potential contributions of the cultivars to fight VAD and mineral deficiencies. Nine DS OFSP cultivars, (Ejumula, Zambezi, Carrot_C, Kakamega, KMI61, Abuket_1, SPK004/6/6, SPK004/6 and Naspot_5/50) and a medium dry and sweet OFSP cultivar (Resisto) were tested in METs in Uganda. The components were smaller than σ2G components for HI, RDM, RST, RSU, and RBC, making it possible to ably select for the traits in the early stages. The σ2GXE components were larger than σ2G components for TYLD and mineral traits. Thus, like yield, breeding for mineral traits in sweetpotato is complex, requiring prior data on the causes of the G X E interactions. Medium to high positive correlations among mineral traits favor parallel selection, and it merits further study to efficiently improve the mineral trait complex by an index. Clearly, a 50- to 100-g ration of all the cultivars, except Naspot_5/50, can provide 100% recommended dietary allowance of vitamin A for a 5- to 8-yr-old child. [ABSTRACT FROM AUTHOR]

Published
2016
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15. Evaluation of Dry Matter, Protein, Starch, Sucrose, β-carotene, Iron, Zinc, Calcium, and Magnesium in East African Sweetpotato [Ipomoea batatas (L.) Lam] Germplasm

Author

Tumwegamire, Silver, primary, Kapinga, Regina, additional, Rubaihayo, Patrick R., additional, LaBonte, Don R., additional, Grüneberg, Wolfgang J., additional, Burgos, Gabriela, additional, Felde, Thomas zum, additional, Carpio, Rosemary, additional, Pawelzik, Elke, additional, and Mwanga, Robert O.M., additional

Published
2011
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35. Preharvest Foliar Applications of Ethephon Increase Skin Lignin/Suberin Content and Resistance to Skinning in Sweetpotato Storage Roots.

Author

Xiang Wang, Arancibia, Ramón A., Main, Jeffrey L., Shankle, Mark W., and LaBonte, Don R.

Subjects
*ETHEPHON, *PHOSPHONIC acids, *LIGNINS, *CROSSLINKED polymers, *SUBERIN
Abstract

Skinning or surface abrasion in sweetpotato [Ipomoea batatas (L.) Lam.] roots during harvest causes a substantial loss of marketable products in storage as a result of rots, loss of moisture, and simply unattractive marketable appearance. In 2008, 2010, and 2011, changes in skinning incidence/severity and skin lignin/suberin content in response to preharvest foliar applications of ethephon or defoliation/devining were investigated. Field-grown 'Beauregard' (B-14) sweetpotato plots were treated with ethephon at 0.84, 1.68, and 2.52 kg·ha-1 (based on the recommendations for tobacco) applied at 1, 3, and 7 days before harvest (DBH). Defoliated/devined treatments were applied at 0, 1, 3, and 7 DBH. Skinning incidence and severity were reduced with ethephon when applied 3 and 7 DBH in 2 of 3 years compared with 1 DBH. The force required to skin the storage root was measured at harvest in 2011 and it increased with defoliation/devining and ethephon applications at 3 and 7 DBH. Skin lignin/suberin was higher in roots from ethephon-treated plants but was weakly correlated (r = 0.51) with the force required to peel the skin. Ethephon applications also increased cortex phenolic content and either decreased or maintained skin phenolic content in storage roots compared with defoliated/devined treatments. These results suggest that skin set and/or skinning resistance in sweetpotato appears to be influenced by other factors in addition to skin lignification/suberization. [ABSTRACT FROM AUTHOR]

Published
2013
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