Water, mineral nutrient and hormone flows and exchanges in the hemiparasitic association between root hemiparasite Rhinanthus minor and the host Hordeum vulgare
type: CreativeWork
description: Summary Using the facultative root hemiparasite Rhinanthus minor and Hordeum vulgare as a host, several aspects of water relations, the flows and partitioning of mineral nutrients, the flows, depositions and metabolism of abscisic acid (ABA) and zeatin type cytokinins (zeatin Z, zeatin riboside ZR, zeatin nucleotide ZN) within the host, the parasite and between host and parasite and the flows and partitioning of the transport metabolites mannitol in the parasite, and of sucrose in the host, have been studied during the study period 41 to 54 days after planting, i.e about 30 to 43 days after successful attachment of the parasite to the host. Water relations Extraction of xylem sap by the parasite from the host’s roots is facilitated by considerably higher transpiration per leaf area in the parasite than in the host and by the fact that stomata of attached Rhinanthus were wide open all day and night despite extremely high ABA concentrations in the leaves. By comparison, another related root hemiparasite, Melampyrum arvense, parasitising on various grasses in the field (botanic garden), showed normal diurnal stomatal behaviour. The abnormal behaviour of Rhinanthus stomata was not due to anatomical reasons as closure could be induced by applying high external ABA concentrations. Remarkable differences have been detected between the hydraulic conductance of barley seminal roots showing relatively low values, and that of Rhinanthus the seminal root showing very high values. The latter could be related to the observed high ABA concentrations in these roots. Whole plant water uptake, transpirational losses, growth-dependent deposition and the flows of water within the plants have been measured in singly growing Rhinanthus and Hordeum plants and in the parasitic association between the two. Water uptake, deposition and transpiration in Rhinanthus were dramatically increased after attachment to the barley host; most of the water used by the parasite was extracted as xylem sap…
abstract: Summary Using the facultative root hemiparasite Rhinanthus minor and Hordeum vulgare as a host, several aspects of water relations, the flows and partitioning of mineral nutrients, the flows, depositions and metabolism of abscisic acid (ABA) and zeatin type cytokinins (zeatin Z, zeatin riboside ZR, zeatin nucleotide ZN) within the host, the parasite and between host and parasite and the flows and partitioning of the transport metabolites mannitol in the parasite, and of sucrose in the host, have been studied during the study period 41 to 54 days after planting, i.e about 30 to 43 days after successful attachment of the parasite to the host. Water relations Extraction of xylem sap by the parasite from the host’s roots is facilitated by considerably higher transpiration per leaf area in the parasite than in the host and by the fact that stomata of attached Rhinanthus were wide open all day and night despite extremely high ABA concentrations in the leaves. By comparison, another related root hemiparasite, Melampyrum arvense, parasitising on various grasses in the field (botanic garden), showed normal diurnal stomatal behaviour. The abnormal behaviour of Rhinanthus stomata was not due to anatomical reasons as closure could be induced by applying high external ABA concentrations. Remarkable differences have been detected between the hydraulic conductance of barley seminal roots showing relatively low values, and that of Rhinanthus the seminal root showing very high values. The latter could be related to the observed high ABA concentrations in these roots. Whole plant water uptake, transpirational losses, growth-dependent deposition and the flows of water within the plants have been measured in singly growing Rhinanthus and Hordeum plants and in the parasitic association between the two. Water uptake, deposition and transpiration in Rhinanthus were dramatically increased after attachment to the barley host; most of the water used by the parasite was extracted as xylem sap…
author: Jiang, Fan
keywords: water, mineral nutrient, Rhinanthus, hemiparasite
date published: 2004-07-28
date modified: 2026-07-24T06:11:27Z
provider: Universität Wüzburg
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Universität Würzburg