Chemical similarity among domesticated and wild genotypes of peanut based on n-alkanes profiles

Abstract

-The objective of this work was to analyze the epicuticular n-alkane profile of domesticated and wild peanut genotypes. Foliar epicuticular n-alkanes of four Arachis hypogaea genotypes and two wild species -A. monticola and A. stenosperma -were analyzed by gas chromatography. Chemical relationships between them were evaluated using the Dice coefficient and UPGMA method. Two clusters were formed: one with four A. hypogaea genotypes and the other with the two wild species. There is more similarity between the BR1 and LIGO-PE06 genotypes and between the BRS 151 L-7 and BRS Havana genotypes.Index terms: Arachis hypogaea, Arachis monticola, Arachis stenosperma, epicuticular wax, hydric stress, phenetics. Similaridade química entre genótipos domesticados e selvagens de amendoim baseada no perfil de n-alcanos Resumo -O objetivo deste trabalho foi avaliar os perfis de n-alcanos epicuticulares foliares de genótipos deArachis hypogaea domesticados e selvagens. Os perfis de n-alcanos epicuticulares foliares de A. hypogaea de quatro genótipos domesticados e de duas espécies selvagens -A. monticola e A. stenosperma -foram analisados por cromatografia gasosa. A similaridade química entre eles foi avaliada pelo coeficiente de Dice e pelo método UPGMA. Dois agrupamentos foram formados: um com os quatro genótipos de A. hypogaea e o outro com as duas espécies selvagens. Há maior similaridade entre os genótipos BR1 e LIGO PE06 e entre BRS 151 L-7 e BRS Havana.

Resistance to Thrips in Peanut and Implications for Management of Thrips and Thrips-Transmitted Orthotospoviruses in Peanut

“…The same group of compounds, were also identified in Arachis monticola Krapov. & Rigoni and A. stenosperma , through gas chromatography ( de Souza et al, 2010 ). In Brazil, another study showed that various wild species exhibited field resistance to E. flavens ( Michelotto et al, 2017 ).…”

“…In South America, besides Frankliniella sp. others such as Enneothrips flavens (Moulton) are commonly found on peanuts ( de Souza et al, 2010 ; Michelotto et al, 2017 ).…”

“…& W. C. Gregory, Arachis glandulifera Stalker, Arachis ipaensis Krapov. & W. C. Gregory, Arachis Chacoense Krapov., and Arachis paraguariensis Chodat & Hassl., is believed to be responsible for suppressing thrips feeding compared with commonly grown peanut cultivars ( Yang et al, 1993 ; de Souza et al, 2010 ). Other morphological traits discussed previously such as leaf hairiness, and leaf toughness are also believed to be involved in conferring resistance to insects including thrips in peanut ( Campbell and Wynne, 1980 ; Yang et al, 1993 ), but their role in suppressing thrips needs to be experimentally demonstrated.…”

“…Also, some odors from rose, Rosa sp., that repelled western flower thrips, and are yet to be characterized ( Gaum et al, 1994 ). de Souza et al (2010) found that certain n-alkanes from wild diploid peanut species could be responsible for E. flavens resistance in Brazil. A polyphenolic compound, 2,3-Di-(E)-caffeoyl-(2B,3R)-(+)-tartaric acid, found in peanut terminals was associated with F. fusca resistance in the Southeastern United States ( Snook et al, 1994 ).…”

Cuticular n-alkane in leaves of seven Neotropical species of the family Lecythidaceae: a contribution to chemotaxonomy

“…To obtain the cuticular wax, individual totally expanded whole fresh leaves from each species, with five replicates, underwent two successive washings during 30 s with 800 mL of dichloromethane (CH 2 Cl 2 ) (Souza et al 2010). n-alkane fractions were separated by TLC and analyzed by GC/EIMS (Shimadzu 17A, Kyoto, Japan).…”