Cyanogenesis and the onset of tapping panel dryness in rubber tree

Pesquisa Agropecuária Brasileira

Elisabeth De Faÿ²  Larissa Alexandra Cardoso Moraes¹  Vicente Haroldo De Figueiredo Moraes¹ 

[1] ,Nancy UniversitéVandœuvre-lès-Nancy Cedex,France

关键词: Hevea;    clonal sensitivity;    cyanogenic potential;    latex pressure potential;    linamarin;    secondary phloem;    Hevea;    sensibilidade clonal;    potencial cianogênico;    potencial de pressão de látex;    linamarina;    floema secundário;   

DOI  :  10.1590/S0100-204X2010001200006

来源: SciELO

【 摘 要 】

The objective of this work was to study the influence of cyanogenesis on the onset of irreversible tapping panel dryness (TPD) and the physiological and histological aspects of secondary phloem in the trunk (tapping panel) of rubber trees (Hevea spp.). Two cyanogenic compounds, linamarin and KCN, were applied separately on the trunk bark of healthy mature trees belonging to two Brazilian clones (Fx 4098 and Fx 3899). Changes in histology, latex pressure potential (ΨP) and cyanogenic potential (HCNp) were followed in the trunk inner barks. In addition, the HCNp levels were determined in TPD-affected plants of both clones. The applications of linamarin or KCN in healthy plants decreased latex ΨP, and formed tylosoids associated with in situ coagulation of latex. The clone Fx 4098 had the higher HCNp and showed the quicker and stronger responses to the cyanogenic compounds. Plants with TPD syntoms had a higher HCNp than the untreated healthy ones. Since histological changes are also structural markers of early TPD, it can be inferred that excessive release of cyanide can induce it in sensitive rubber clones

【 授权许可】

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