Relationship between resistance to Microcyclus ulei and clonal foliar phenolics of rubber trees

Coupe M., . and Berger P., . and Petat J. M., . and Rivano F., . and Sanier C., . and de Saint Blanquat A., . and Macheix J. J., . and d’Auzac J., . Relationship between resistance to Microcyclus ulei and clonal foliar phenolics of rubber trees. pp. 38-59. ISSN 0127-7065

The extent to which resistance of Hevea brasiliensis to Microcyclus ulei may be related to the presence or absence of certain foliar phenolics analysed by High Performance Liquid Chromotography (HPLC) after selective extraction was studied. Young leaves at M. ulei-sensitive (B2) stage from fourteen clones with a broad range of resistance were used. The resistance to M. ulei of these clones was evaluated in the field by determining the percentage of leaf abscission during a one-year period. No qualitative differences were observed between the foliar phenolics of various clones of Hevea brasiliensis and hybrid rubber trees. Except for clones PB 235 and PB 260 the total quantity of phenols and the proportion of flavans appear to be related to resistance to M. ulei expressed as percentage of abscission. Multiple regression analysis showed that some compounds seemed to be closely related to the percentage of abscission whereas others appeared to be correlated with resistance (kaempferol-3-rutinoside 3p-coumaroylquinic acid). Classification of the fourteen clones as sensitive and resistant shows that some phenols are present in resistant clones and others are found in susceptible clones ( )-catechin and rutin. Likewise the hydroxycinnamic derivatives (HDC)/flavonols ratio the percentage of ratin in relation to total flavonols and the ratios of certain phenols (kaempferol-3-rutinoside: kaempferol-galactoside rutin: kaempferol-galactoside) appeared in particular to be related to clonal resistance.

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Abstract

The extent to which resistance of Hevea brasiliensis to Microcyclus ulei may be related to the presence or absence of certain foliar phenolics analysed by High Performance Liquid Chromotography (HPLC) after selective extraction was studied. Young leaves at M. ulei-sensitive (B2) stage from fourteen clones with a broad range of resistance were used. The resistance to M. ulei of these clones was evaluated in the field by determining the percentage of leaf abscission during a one-year period. No qualitative differences were observed between the foliar phenolics of various clones of Hevea brasiliensis and hybrid rubber trees. Except for clones PB 235 and PB 260 the total quantity of phenols and the proportion of flavans appear to be related to resistance to M. ulei expressed as percentage of abscission. Multiple regression analysis showed that some compounds seemed to be closely related to the percentage of abscission whereas others appeared to be correlated with resistance (kaempferol-3-rutinoside 3p-coumaroylquinic acid). Classification of the fourteen clones as sensitive and resistant shows that some phenols are present in resistant clones and others are found in susceptible clones ( )-catechin and rutin. Likewise the hydroxycinnamic derivatives (HDC)/flavonols ratio the percentage of ratin in relation to total flavonols and the ratios of certain phenols (kaempferol-3-rutinoside: kaempferol-galactoside rutin: kaempferol-galactoside) appeared in particular to be related to clonal resistance.

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Item Type:	Article
AGROVOC Term:	Hevea brasiliensis
AGROVOC Term:	Microcyclus ulei
AGROVOC Term:	High performance liquid chromatography
AGROVOC Term:	Extraction
AGROVOC Term:	Foliar application
AGROVOC Term:	Phenolic compounds
AGROVOC Term:	Rubber crops
AGROVOC Term:	Leaves
AGROVOC Term:	Abscission
AGROVOC Term:	Chemical resistance
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23450

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