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<p><i>Phragmanthera austroarabica</i> is a hemiparasitic plant that can infect several cultivated and wild tree species and withdraws the necessary nutritive resources. Its relationship with hosts remains unknown therefore this study aimed to investigate the association host-hemiparasite <i>Acacia gerrardii</i>-<i>P. austroarabica</i> based on their water status, photosynthetic activities, and multi-element and untargeted metabolite distributions. Results showed that <i>P. austroarabica</i> had higher water potential (4.3-fold), osmotic potential (2.4-fold), transpiration rate (1.4-fold) and stomatal conductance (1.7-fold) while it exhibited the lower net photosynthetic assimilation rate (0.4-fold) and water use efficiency (0.3-fold) than the host. Besides, it had the ability to reduce accumulation of the most major, trace and ultra-trace elements, except potassium which was 3-folds more accumulated than in the host. Likely, the hemiparasite used high transpiration rate to assure xylem streaming from the host and seemed to increase water and osmotic potentials, and safeguard the photosynthetic activity of the host. UPLC-MS2 study revealed that the hemiparasite had the lower number of metabolites. The potentially used compounds either by <i>P. austroarabica</i> to weaken the host and extract more nutritive resources or by <i>A. gerrardii</i> to defend against the hemiparasite attack and overcome the induced stress were pointed out.</p>

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Host–hemiparasite Acacia gerrardii –Phragmanthera austroarabica relationship: Physiological and biochemical aspects

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Zouhaier Barhoumi,
  • Abdallah Atia,
  • Ahmed Abdallah Hussain,
  • Salem Elkahoui,
  • Ali Alalmie

摘要

Phragmanthera austroarabica is a hemiparasitic plant that can infect several cultivated and wild tree species and withdraws the necessary nutritive resources. Its relationship with hosts remains unknown therefore this study aimed to investigate the association host-hemiparasite Acacia gerrardii-P. austroarabica based on their water status, photosynthetic activities, and multi-element and untargeted metabolite distributions. Results showed that P. austroarabica had higher water potential (4.3-fold), osmotic potential (2.4-fold), transpiration rate (1.4-fold) and stomatal conductance (1.7-fold) while it exhibited the lower net photosynthetic assimilation rate (0.4-fold) and water use efficiency (0.3-fold) than the host. Besides, it had the ability to reduce accumulation of the most major, trace and ultra-trace elements, except potassium which was 3-folds more accumulated than in the host. Likely, the hemiparasite used high transpiration rate to assure xylem streaming from the host and seemed to increase water and osmotic potentials, and safeguard the photosynthetic activity of the host. UPLC-MS2 study revealed that the hemiparasite had the lower number of metabolites. The potentially used compounds either by P. austroarabica to weaken the host and extract more nutritive resources or by A. gerrardii to defend against the hemiparasite attack and overcome the induced stress were pointed out.