THE EFFECT OF WATERLOGGING ON SEEDLINGS OF <i>EUCALYPTUS MARGINATA</i>

Davison, Elaine; Tay, F. C. S.

doi:10.1111/j.1469-8137.1985.tb02879.x

Cited by 42 publications

(45 citation statements)

References 17 publications

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“…Our work has shown that increased sporulation and growth of P. cinnamomi will not occur in waterlogged soil because aeration is inadequate (Davison & Tay, 1986). Waterlogging, however, directly affects the host because when glasshousegrown jarrah seedlings are flooded the xylem vessels in the root and stem become blocked with tyloses, and as the plants continue to transpire they eventually wilt and die (Davison & Tay, 1985). In this paper we examine the efTect of short-term waterlogging on infection of jarrah seedlings by P. cinnamomi.…”

Section: Introductionmentioning

confidence: 99%

THE EFFECT OF WATERLOGGING ON INFECTION OF EUCALYPTUS MARGIN AT A SEEDLINGS BY PHYTOPHTHORA CINNAMOMI

Davison

Tay

1987

New Phytologist

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SUMMARYThree-to four-month-old Eucalyptus marginata Donn ex Sm. (jarrah) were grown in the glasshouse in peat/sand at 20 °C root temperature, infected with zoospores of Phytophthora cinnamomi Rands, added either 10 cm below the soil surface or flooded onto the soil, and various waterlogging regimes were imposed. When plants were infected but not waterlogged, the proportion of infected root length adjacent to the point where zoospores were added was low. More lesions were formed per metre root length on tap roots than on lateral roots, but lesions on lateral roots were longer than on tap roots. When plants were waterlogged for a 4 d period before the addition of zoospores, there was no increase in root infection. When plants were waterlogged at the same time or after the pots were inoculated, there was a significant increase in the proportion of root length infected. This was due to an increase in the number of lesions and not, in four of the five harvests, to an increase in lesion length.When inoculation and waterlogging were imposed at the same time, the increased number of infections was probably due both to the increased attraction of zoospores to anaerobically respiring roots and to increased zoospore motility in flooded soil. When waterlogging was imposed several days or weeks after the plants had been infected, the increased number of lesions was unlikely to have been due to residual zoospores in the soil, because their numbers declined exponentially. It was also unlikely to have been due to sporangia developing de novo on the roots after waterlogging had been imposed, because the Og concentration of the soil solution was inadequate. It is probable, therefore, that the new infections originated from zoospores liberated from sporangia already formed on lesions before waterlogging was imposed.When plants were infected but not waterlogged, there was no efl^ect on the leaf difl^usive resistance, leaf relative water content and shoot xylem pressure potential between 1 and 28 d. When plants were flooded, the daily water loss decreased more rapidly and plants died more rapidly in the inoculated and waterlogged treatments than in the treatments which were only waterlogged. Infection by P. cinnamomi did not aflf^ect the proportion of xylem vessels occluded with tyloses in seven of the eight unflooded, and seven of the eight flooded, comparisons.

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Section: Introductionmentioning

confidence: 99%

THE EFFECT OF WATERLOGGING ON INFECTION OF EUCALYPTUS MARGIN AT A SEEDLINGS BY PHYTOPHTHORA CINNAMOMI

Davison

Tay

1987

New Phytologist

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“…As tylosed vessels contain air not water they are no longer able to conduct water (Zimmermann 1983). Most tree seedlings close their stomata when they are waterlogged, but jarrah does not and continues to transpire (Davison and Tay 1985). Consequently during summer, when transpiration rates are high, seedlings wilt and die (Fig.…”

Section: Waterlogging Damagementioning

confidence: 99%

“…When seedlings are waterlogged the xylem vessels in the tap root rapidly cavitate and become occluded with tyloses (Fig. 6), with the proportion of tylosed vessels being proportional to the duration of flooding (Davison and Tay 1985). As tylosed vessels contain air not water they are no longer able to conduct water (Zimmermann 1983).…”

Section: Waterlogging Damagementioning

confidence: 99%

“…(a) unflooded control; (b) flooded for 8 days. From Davison and Tay (1985) reproduced with permission from New Phytologist a b c d Fig. 7 The effect of water logging three-month-old Eucalyptus marginata for 3, 6 and 9 days in the summer.…”

Section: P Cinnamomi Waterlogging and The Death Of Jarrah Treesmentioning

confidence: 99%

“…(a) unflooded controls; (b) flooded 3 days, drained 7 days; (c) flooded 6 days, drained 4 days; (d) flooded 9 days, drained 1 day. Modified from Davison and Tay (1985) with permission from New Phytologist…”

Section: P Cinnamomi Waterlogging and The Death Of Jarrah Treesmentioning

confidence: 99%

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Resolving confusions about jarrah dieback - don’t forget the plants

Davison

2014

Australasian Plant Pathol.

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The name jarrah dieback has been used for two different disorders, leading to considerable confusion. It was coined in the 1940s to describe the sudden death of groups of jarrah (Eucalyptus marginata) trees in south western Western Australia, which occurred on poorly drained sites, following exceptionally heavy rainfall. In the 1960s these sites were shown to be infested by Phytophthora cinnamomi and jarrah deaths were attributed to it, even though it was only isolated from 5 % of sampled trees. Also the definition of jarrah dieback was expanded to include deaths of many other plants on infested sites, from which P. cinnamomi was more readily isolated. Jarrah trees die from severe water deficiency, indicating problems with water conduction through roots. Xylem vessel diameters vary along roots, being narrow at the root collar, while distally they are larger, providing water storage. Jarrah transpires vigorously during summer, accessing water at depth on sites with deep soil, but being more dependent on internally stored water when root systems are shallower. Following waterlogging, sapwood vessels become blocked with tyloses, reducing both conductivity and potential water storage; such trees may have insufficient water reserves for summer survival. In jarrah P. cinnamomi is unlikely to cause water deficiency because sapwood invasion is rapidly contained in healthy roots. Recent investigations into P. cinnamomi invasion and host responses in other plants show that it can potentially cause a vascular wilt in Banksia spp. and chronic, symptomless infections in herbaceous plants. Susceptibility to waterlogging damage, and/or mortality resulting from infection by P. cinnamomi can only be clarified by detailed knowledge of the hosts and their vulnerabilities. This is essential for making diagnoses, devising management strategies, and avoiding the confusions of the past.

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Role of Aquaporins in the Maintenance of Xylem Hydraulic Capacity

Zwieniecki

Secchi

2017

Plant Aquaporins

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THE EFFECT OF WATERLOGGING ON SEEDLINGS OF EUCALYPTUS MARGINATA

Cited by 42 publications

References 17 publications

THE EFFECT OF WATERLOGGING ON INFECTION OF EUCALYPTUS MARGIN AT A SEEDLINGS BY PHYTOPHTHORA CINNAMOMI

THE EFFECT OF WATERLOGGING ON INFECTION OF EUCALYPTUS MARGIN AT A SEEDLINGS BY PHYTOPHTHORA CINNAMOMI

Resolving confusions about jarrah dieback - don’t forget the plants

Role of Aquaporins in the Maintenance of Xylem Hydraulic Capacity

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