摘要:

AbstractLeaf age was a significant (P<0.05) factor in the resistance of poplar cultivars toM. brunnea. Leaf surface (adaxial/abaxial) was not a significant factor forP. nigra, P. deltoidesandP. ×euramericanabut was for several miscellaneous cultivars. There was no significant correlation between stomatal frequency andM., brnnncainfection level. Ultrastructural studies showed hyphae penetrated cell walls ot soft expanding leaves more readily than cell walls of mature leaves. The higher resistance of mature leaves was thus attributed to differences in cell wall ultrastructure. Differential resistance of the two leaf surfaces of mature leaves ofP. candicanswas attributed to the strong cutinisation of the epidermal cell wall of the highly resistant adaxial surface

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1984.tb00173.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

AbstractSeven clones of hybrid poplar, with parents from among four sections of the genusPopulus, were potted in five Iowan soils. After a year they were sampled for mycorrhizae and endogonaceous spores. Eight species of Endogonaceae were recorded, seven known to form endomycorrhizae. Two ectomycorrhizal fungi,Ccnococcum geophilumand an unidentified species were noted. One poplar clone had fewer replicates in whichGlomus fasciculatumspores were found, but otherwise there were no differences among the poplars in presence of spores. A soil from aP. grandidentatawoodland had fewer pots with G.mosseaespores, while an agricultural soil had more occurrences ofGigaspora giganteathan other soils. No other significant differences among spores were noted for soils. Vesicles of endomycorrhizae occurred in all clones, but one was colonized more sparsely than the others. Two clones had ecto‐ and ectendo‐mycorrhizae, two types of the former being recorded. One of these clones had significantly moreC. geophilumcolonization than the other. There were indications of differences in mycotrophy among the sections of the genusPopu

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1984.tb00174.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

AbstractHydrogen peroxide‐a substance for preventing stump infection by Heterobasidion annosum in spruce stands?Stem disks of spruce were treated with hydrogenperoxide to avoidH. annosuminfection. The persistence of the treatment was investigated. It proved to be unexpectedly good. Possible suitability of hydrogen peroxide as a protective agent againstHeterobasidion annosumas well as the necessity of further investigations is discusse

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1984.tb00175.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

AbstractThe carotenoid pattern ofChrysomyxainfected spruce needles is investigated over one vegetation period. The rust fungus contains β‐carotene and γ‐carotene, and the quantity of both carotenes depends on the ontogeny of the fungus. The pigments of spruce needles are generally dimin

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1984.tb00176.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

AbstractExperimental proof of needle inhabiting fungi in conifers. I. Spruce (Picea abies). Various methods are described, which can be used to establish the presence of fungi in needles of conifers and to classify them. Culture characteristics ofLophodermium piceae, L. filiforme, Rhizosphaera kalkhoffii, Thysanophora penicillioidesandTiarosporella parcaarc given.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1984.tb00177.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

AbstractThe influence of SO2on the metabolism of SO2‐tolerant and SO2‐sensitive seedlings of Scots pine was investigated. Under the influence of SO2changes were observed in14CO2assimilation, in14C‐fixation pattern and in14C‐translocation. The changes were more marked in the SO2‐sensitivc plants than in the more tolerant ones. The inhibition of14C‐transport from needles to roots following SO2fumigation was stronger than the reduction in

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1984.tb00178.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

AbstractCollar rot ofSwietenia macrophyllaand leaf blight ofPterocarpus santalinuscaused bySclerotium rolfsiiare reported for the first time from India. KFRI Scientific Paper No. 40

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1984.tb00179.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY