Identification of the fungi associated with damping‐off in the regeneration of Eucalyptus obliqua and E. radiata in a central Victorian forest

Mwanza, E. J. M.; Kellas, J. D.

doi:10.1111/j.1439-0329.1987.tb01022.x

Cited by 14 publications

(9 citation statements)

References 5 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This probably resulted from pathogenic fungi, a previously reported cause of winter mortality of eucalypt seedlings (Grose 1957;Cunningham 1960;Mwanza & Kellas 1987). Mwanza and Kellas (1987) found that damping-off deaths of Eucalyptus obliqua and Eucalyptus radiata occurred within the first 8 weeks after emergence. Their seedlings were affected by seedbed conditions and overstorey density and deaths were caused mostly by Pythium and Eusarium.…”

Section: Discussionmentioning

confidence: 93%

“…Accepted for publication August 1993. fungi, low light intensities and frost (Cunningham 1960;Mwanza & Kellas 1987;Battaglia & Wilson 1990). \n Eucalyptus marginata Donn ex Smith (jarrah) seedlings a trend has been shown for mortality to be greater in uncultivated seedbeds, in seedbeds with groundcover vegetation and litter, and where there was grazing by native vertebrates (Abbott 1984;Abbott & Loneragan 1986).…”

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Mortality of Eucalyptus marginata (jarrah) seedlings in Mediterranean‐climate forest in response to overstorey, site, seedbed, fertilizer application and grazing

Stoneman

Dell

Turner

1994

Australian Journal of Ecology

View full text Add to dashboard Cite

The effects of overstorey, site, seedbed, seedling density, application of fertilizer and grazing on mortality of Eucalyptus marginala (jarrah) seedlings were studied experimentally in the northern jarrah forest of Western Australia. Rainfall, soil temperature, soil water deficits, leaf water potentials and photosynthetically active radiation (PAR) were monitored. Seedlings on sites with the overstorey removed experienced significantly higher soil temperatures for 9 months of the year (of up to 6°C), smaller soil and leaf water deficits during the dry season (minimum predawn leaf water potentials of -0.5 MPa compared to -1.6 MPa) and higher intensities of PAR (maximum values of 1900 i^mol m"^ s"' compared to 900 |imol m~2 s~'), compared to seedlings on sites with the overstorey retained. Mortality of £. marginata seedlings was greater on sites where the overstorey was retained compared to where the overstorey was removed, on low quality sites than high quality sites, and on undisturbed and lightly disturbed seedbeds compared to heavily disturbed seedbeds. Seedling density, application of fertilizer and grazing by vertebrates did not have a significant effect on percentage mortality. Most ofthe mortality occurred as water deficits developed in late spring and summer and was attributed to these water deficits. Some mortality that occurred prior to the development of substantial water deficits was probably caused by pathogenic fungi. We conclude that mortality of .£", marginata seedlings in the northern jarrah forest of Western Australia can be minimized by reducing the density of the overstorey and by seeding into a seedbed that has had litter and groundcover removed and the soil disturbed,

show abstract

Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 95%

Mortality of Eucalyptus marginata (jarrah) seedlings in Mediterranean‐climate forest in response to overstorey, site, seedbed, fertilizer application and grazing

Stoneman

Dell

Turner

1994

Australian Journal of Ecology

View full text Add to dashboard Cite

show abstract

“…Species of Penicillium are often associated with post-harvest diseases [5] or are pathogenic on intact growing plants [6]. P. olsonii is among the rarest clearly distinct species of the genus Penicillium [7] and was described in association with a damping-o¡ disease of eucalyptus seedlings [8]. P. olsonii can also infect intact leaves of Arabidopsis thaliana and secretes PGs during the infection process (W. Scha «fer, unpublished results).…”

Section: Introductionmentioning

confidence: 99%

Cloning and targeted disruption of two polygalacturonase genes in Penicillium olsonii

Wagner

2000

FEMS Microbiology Letters

View full text Add to dashboard Cite

The filamentous fungus Penicillium olsonii secretes several polygalacturonases (PGs) with molecular masses of about 47 kDa. These enzymes consist of several basic and acidic isoforms, with dominant activities at pI 4.5 and pI 7.9. Two polygalacturonase genes, pg1 and pg2, have been cloned. The corresponding enzymes, PG1 and PG2, consist of 370 and 380 amino acids, respectively, and show significant similarities to endo-polygalacturonases from other filamentous fungi. Targeted disruption of pg1 resulted in the elimination of all basic PG isoforms. In contrast, disruption of pg2 reduced, but did not eliminate the acidic PG activities. The PGs of P. olsonii must therefore be encoded by a gene family of at least three genes. Induction studies with various carbon sources revealed that the acidic and basic isoforms are differentially regulated. Pectin is the best inducer of the acidic PG isoforms. The basic isoforms, however, are best induced by monosaccharides like glucose, K-L-rhamnose and K-L-arabinose. ß

show abstract

“…Biotic factors included seed harvesting, which has already been mentioned. In addition, soil pathogens may cause mortality (Mwanza and Kellas 1987), and allelopathic effects may restrict emergence levels, but its importance depends on the species, the amount and types of litter, soil properties and climate (May and Ash 1990). Direct effects included seedbed conditions and overstorey density.…”

Section: Basic Mechanisms Of Seed Dispersal and Seedling Establishmentmentioning

confidence: 99%

Going nowhere fast: a review of seed dispersal in eucalypts

Booth¹

2017

Aust. J. Bot.

View full text Add to dashboard Cite

Abstract. Eucalypt species have several features that make them particularly well suited for climate change studies. A key assumption is that they have very limited powers of dispersal. If this is correct, it means that climate change analyses to the end of this century can concentrate mainly on assessing whether or not eucalypt species are likely to be able to survive at their existing sites. A recent major climate change study of more than 600 eucalypt species for the period 2014-2085 has used 5 km as a usual dispersal limit for the period to 2085, with the possibility of rare long-distance events. The review presented here considers how far natural stands of eucalypt species are likely to be able to migrate in the period to 2085. It is the first review to consider eucalypt seed dispersal as its major focus. It draws on evidence from millions of years ago to the present, and from eucalypt stands in Australia and around the world. Although rare long-distance events cannot be entirely ruled out, it is concluded that the great bulk of the evidence available indicates that the most likely potential dispersal rate is equivalent to about 1-2 m per year, i.e.~70-140 m in the period to 2085. Over decades, this is likely to occur as a series of stepwise events, associated with disturbances such as bushfires. However, limitations such as inadequate remnant eucalypt stands and extensive agricultural developments may reduce actual migration rates below even this modest potential.

show abstract

Identification of the fungi associated with damping‐off in the regeneration of Eucalyptus obliqua and E. radiata in a central Victorian forest

Cited by 14 publications

References 5 publications

Mortality of Eucalyptus marginata (jarrah) seedlings in Mediterranean‐climate forest in response to overstorey, site, seedbed, fertilizer application and grazing

Mortality of Eucalyptus marginata (jarrah) seedlings in Mediterranean‐climate forest in response to overstorey, site, seedbed, fertilizer application and grazing

Cloning and targeted disruption of two polygalacturonase genes in Penicillium olsonii

Going nowhere fast: a review of seed dispersal in eucalypts

Contact Info

Product

Resources

About