Infection and Pathogenesis

  • Govind Singh Saharan
  • Naresh Mehta
  • Prabhu Dayal Meena


In crucifers, the downy mildew infection may be either general or local. In the former case, all or most of the leaves, and inflorescence, may bear conidiophores. Although some parts (especially the stem) may show no external injury, microscopic examination shows the mycelia are in the tissues. Generalized infection is restricted to young tissues, and seedlings may show completely infected leaves. Localized infection also occurs in young tissues, especially those still in active division. In the hypertrophy caused by Albugo, the cells of the epidermis and cortex are dividing and may readily give entrance to Hyaloperonospora. Young inflorescence may wholly or partly be infected, while normal tissues of older stems and leaves below the initial site of infection may remain free.


  1. Achar PN (1992) Dose-response relationship of Peronospora parasitica in Raphanus sativus. Phyton (Buenos Aires) 53:89–94Google Scholar
  2. Awasthi RP, Nashaat NI, Heran A, Kolte SJ, Singh US (1997) The effect of Albugo candida on the resistance to Peronospora parasitica and vice versa in rapeseed-mustard. ISHS Symposium on Brassicas, Tenth Crucifer Genetics Workshop, 23–27 Sept 1997, Rennes, FranceGoogle Scholar
  3. Butler EJ (1918) Fungi and diseases in plant. Thaker Spink & Co., Calcutta, pp 297–300Google Scholar
  4. Chang IH, Xu RF, Chiu WF (1963) On the primary sources of infection of the downy mildew of Chinese cabbage caused by Peronospora parasitica (Pers.) Fr. and the limited systemic infection of seedlings. Acta Phytopathol Sin 6:153–162Google Scholar
  5. Chou CK (1970) An electron-microscope study of host penetration and early stages of haustorium formation of Peronospora parasitica (Fr.) Tul. on cabbage cotyledons. Ann Bot 34:189–204CrossRefGoogle Scholar
  6. Chu HT (1935) Notes on the penetration phenomena and haustorium formation of Peronospora brassicae Gaum. Ann Phytopathol Soc Japan 2:150–157CrossRefGoogle Scholar
  7. Felton MW, Walker JC (1946) Environmental factors affecting downy mildew of cabbage. J Agril Res 72:69–81Google Scholar
  8. Jang P, Safeeulla KM (1990) Modes of entry, establishment and seed transmission of Peronospora parasitica in radish. Proc Indian Acad Sci Plant Sci 100:369–373Google Scholar
  9. Jonsson R (1966) Peronospora on oil yielding Brassicas. Methods for testing resistance in winter rape and their results. Sver Utsadestor Tidskr 76:54–62Google Scholar
  10. Keogh RC, Deverall BJ, McLeod S (1980) Comparison of histological and physiological responses to Phakopsora pachyrhizi in resistant and susceptible soybean. Trans Br Mycol Soc 74:329–333CrossRefGoogle Scholar
  11. Kluczewski SM, Lucas JA (1982) Development and physiology of infection by the downy mildew fungus Peronospora parasitica (Pers. ex Fr.) Fr. in susceptible and resistant Brassica species. Plant Pathol 31:373–389CrossRefGoogle Scholar
  12. Koch E, Slusarenko AJ (1990) Arabidopsis is susceptible to infection by a downy mildew fungus. Plant Cell 2:437–445CrossRefPubMedPubMedCentralGoogle Scholar
  13. Krober H (1969) Degree of infestation of cabbage turnip by Peronospora parasitica (Pers.) Fr. and of tobacco by Peronospora tabacina Adam as related to concentration of conidia. Phytopath Z 66:180–187CrossRefGoogle Scholar
  14. LeBeau FJ (1945) Systemic invasion of cabbage seedlings by the downy mildew fungus. J Agric Res 71:453–463Google Scholar
  15. Lucas JA, Hayter JBR, Crute IR (1995) The downy mildews: host specificity and pathogensis. In: Kohmoto K (ed) Pathogensis and host specificity in plant diseases, vol Vol. 2. Elsevier Science Ltd, OxfordGoogle Scholar
  16. Preece TF, Barnes G, Bayley JM (1967) Junctions between epidermal cells as sites of appresorium formation by plant pathogenic fungi. Plant Pathol 16:117–118CrossRefGoogle Scholar
  17. Shiraishi M, Sakomoto K, Asada Y, Nagatani T, Hidaka H (1975) A scanning electron microscopic observation on the surface of Japanese radish leaves infected by Peronospora parasitica (Fr.) Fr. Ann Phytopathol Soc Japan 41:24–32CrossRefGoogle Scholar
  18. Singh SB, Singh DV, Bains BS (1980) In vivo cellulase and pectinase production by Albugo candida and Peronospora parasitica. Indian Phytopath 33:370–371Google Scholar
  19. Slusarenko AJ, Longland AC (1986) Changes in gene activity during the expression of the hypersensitive response in Phaseolus vulgaris cv. Red Mexican to an avirulent race 1 isolate of Pseudomonas syringae pv. phaseolicola. Physiol Mol Plant Pathol 29:79–94CrossRefGoogle Scholar
  20. Soylu EM, Soylu S, Mansfield JW (2004) Ultra-structural characterization of pathogen development and host responses during compatible and incompatible interactions between Arabidopsis thaliana and Peronospora parasitica. Physiol Mol Plant Pathol 65:67–78CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2017

Authors and Affiliations

  • Govind Singh Saharan
    • 1
  • Naresh Mehta
    • 1
  • Prabhu Dayal Meena
    • 2
  1. 1.Department of Plant PathologyCCS Haryana Agricultural UniversityHisarIndia
  2. 2.ICAR-Directorate of Rapeseed Mustard ResearchBharatpurIndia

Personalised recommendations