摘要:

AbstractTwo methods were compared intending to distinguish between the clones of the root‐rot fungusArmillaria obscura(syn.Armillaria ostoyae) in nature: one based on the pairing of the diploid isolates in pure culture, the other using the incompatibility alleles as genetic markers. AsA. obscurafruits easily in vitro, both methods could be used for any type of diploid isolate whatever its origin.The two methods were quite superposable and defined the same clones. Artificial diploids issuing from the same fruitbody and isogenic for the incompatibility alleles appeared to belong to the same clone in pairing test

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1990.tb01138.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

AbstractNutrient status, sapwood basal area (SBA) and sapwood to heartwood basal area (S/H) were measured on second growthPseudotsuga menztesntrees in western Montana.Armillaria‐infected trees had significantly lower S/H ratios, growth, and foliar N and S concentrations than noninfected trees. Our results indicate a general influence ofArmillariainfection on nutrient content and physiological status ofP. menziesütrees. However, these measurements are not a reliable method to determine the extent of infecti

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1990.tb01139.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

AbstractSuberization responses to naturally‐occurring fungal colonization of living xylem tissues were detected in 30 of 37 woody species examined. These responses comprised the suberization of traumatic parenchyma tissues in compartmentalization wall 4 barrier zones laid down in the vicinity of fungally infected wounds, or the suberization of parenchyma cells, tyloses and vessel linings in reaction zone decay margins in fully differentiated sapwood. Additionally, in a few species, suberization of xylem fibres and tracheids was observed where juvenile xylem tissues, apparently still incompletely differentiated, had been exposed by wounding. These xylem suberization responses are considered to increase the decay resistance of the altered cells, and may protect the hydraulic integrity of adjacent tissue, thus contributing to the antimicrobial defence of the living sapwoo

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1990.tb01140.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

AbstractObserved on a 5 × 5 cm small surface of litter in a 35‐years‐old Scots pine stand with bracken and the mossPseudoscleropodium purum, the F1layer is extensively invaded by a mycelial mat made of several mycorrhizal fungi. Observations under a light microscope gave circumstantial evidence of the role of these fungi in advanced stages of decomposition: they seem to protect the partly decayed plant material and the faeces deposited by soil animals from subsequent attack by soil bacteria. Penetration of pine needles and cadavers or soil arthropods is prominent in so far as animals have previously made entries by tunnelling into the substrates. In addition the black mycorrhizal fungusCenococcum geophilumwas observed to penetrate bracken epidermal cells by its own means and to make lysis zones in dead arthropod cuticles. Consequences for forest soil ecology and tree nutrition are discussed in view of existing litera

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1990.tb01141.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

AbstractInoculations of fungi or introductions of insects were performed on Scots pines. The monoterpene composition of the induced resin differed from that of preformed resin, but did not depend on the nature of the aggression on a same tree. There were variations in the composition of induced resin according to tree. Mycelial growth was strongly limited, more by the increase in resin quantity and total monoterpene quantity than by the qualitative changes of the monoterpene composition. Monoterpenes appeared very toxic forTomicus piniperda, but not for Ips sexdentatus.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1990.tb01142.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

AbstractMovement of water forced through stem segments of two half‐sib families of loblolly pine (Pinus taeda), infected byFusarinum subglutinans, was monitored. Wilt rate of the two families was shown to be correlated with obstruction of water flow through stem segments of similar disease severit

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1990.tb01143.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY