摘要:

A tobacco necrosis virus has been isolated from the leaves and flowers of naturally infectedPrimula obconicaplants. Although the virus produces no necrotic symptoms, it is not distributed uniformly through primulas, but occurs only in isolated regions, most of the tissues being apparently virus‐free.When inoculated to healthy primulas, three tobacco necrosis viruses were found to behave similarly. They all enter and multiply locally, but produce no symptoms; movement from the inoculated areas occurs only rarely and then does not cause a full systemic infection but only further localized infections. Multiplication of the viruses in primula is slower than in tobacco or French bean, which react necrotically.The uncertainties in interpreting results of tests for tobacco necrosis viruses are described and possible explanations of natural infections are discusse

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1947.tb06349.x

出版商:Blackwell Publishing Ltd    

年代:1947

数据来源: WILEY

摘要:

Of 1915 flowering plants 23 % gave extracts which completely inhibited the germination of the conidia ofVenturia inaequalisunder the experimental conditions used. The plants which gave active extracts are distributed throughout the Angiosperms, and there is no correlation with systematic position. The inhibitors were distributed generally in some plants and were localized in others, e.g. to the leaves.Some extracts appeared merely to inhibit the germination of the conidia while others killed them.Some inhibitors disappeared when the plants were dried, other dry material was still active when retested several months later.Hedera Helixcontains an inhibitor which is active when the extract is diluted 128 times.

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1947.tb06350.x

出版商:Blackwell Publishing Ltd    

年代:1947

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1947.tb06351.x

出版商:Blackwell Publishing Ltd    

年代:1947

数据来源: WILEY

摘要:

The New Genetics in the Soviet Union.By P. S. Hudsonand R. H. RichensTrace Elements in Plants and Animals.By WalterStilesActions of Radiations on Living Cells.By D. E. LeaBiology of Tissue Cells.By AlbertFischerGall Midges of Economic Importance.By H. F. Barnes, Agricultural and Horticultural HandbooksDDT The Synthetic Insecticide.By T. F. West, M.Sc., Ph.D. (Lond.), F.R.I.C. and G. A. Campbell, M.Sc. (Leeds), F.R.I.C.Danish Review of Game Biology.

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1947.tb06352.x

出版商:Blackwell Publishing Ltd    

年代:1947

数据来源: WILEY