TY  - BOOK
AU  - Maiden, N.A.
AU  - Syd Ali, N., Ahmad, K., Atan, S. and Wong, M.Y.
TI  - Physiological and metabolic changes in Hevea brasiliensis associated with Rigidoporus microporus infection
PB  - Proceedings of the IRRDB International Rubber Conference 2023, 20-21 February 2023, IRRDB, Kuala Lumpur, Malaysia, pp. 174-178.
KW  - White root disease
KW  - Leaf gas exchange
KW  - Metabolites
KW  - Rigidoporus microporus
N2  - One of the most debilitating diseases affecting the rubber tree (Hevea brasiliensis) is white root disease caused by the fungal pathogen Rigidoporus microporus. Controlling the disease is challenging because infection occurs below-ground and above-ground. Symptoms are manifested only when infection is at advanced stage. How this disease alters host physiology and metabolism is scarcely explored. This study investigated the effects of R. microporus infection on leaf gas exchange parameters and the global metabolome of H. brasiliensis. Disease severity and leaf gas exchange parameters were measured, and metabolite extraction were conducted at zero, three and six months after inoculation (mai). Significant differences in leaf gas exchange parameters between inoculated and non-inoculated plants were detected as early as three mai. Twenty seven unique metabolites were selected based on multivariate analysis and 23 of them were annotated. The annotated metabolites included compounds from various classes play roles related to various aspects of stress response. Pearson correlation coefficient was performed to identify characters associated with below-ground disease progression. Net CO2 assimilation rate (A), stomatal conductance to water vapour (gs) and 15 metabolites showed highly significant negative correlation while 11 metabolites exhibited highly significant positive correlation with root disease severity index (%). These observations can be utilised in the development of diagnostic tools for early detection of white root disease
ER  -