EurekaMag.com logo
+ Site Statistics
References:
48,253,228
Abstracts:
22,798,842
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Behaviour of zoospore cysts of the mycoparasite Pythium oligandrum in relation to their potential for biocontrol of plant pathogens


, : Behaviour of zoospore cysts of the mycoparasite Pythium oligandrum in relation to their potential for biocontrol of plant pathogens. Mycological Research 99(12): 1417-1424

Several in vitro features of zoospore cysts of Pythium oligandrum suggest their potential value for biocontrol, in place of oospores which germinate slowly and erratically. Cysts germinated rapidly (20-30 min) in water at 20-25 degree C. They also germinated, but more slowly, at water potentials down to -6.6 MPa (PEG 8000 solutions) or -2.65 MPa (mannitol solutions), whereas mycelia did not grow at -2.1 MPa. Cysts could be stored for at least 3 wk in PEG at 4-7 degree , and germinated when the PEG was diluted and temperature was raised to 20 degree . Germinating cysts rapidly ( lt 1 h) parasitized hyphae of Fusarium oxysporum and F. culmorum in the absence of exogenous nutrients. When cysts of a metalaxyl-tolerant mutant of P. oligandrum were added to moist, unsterile soil at 20 degree , the fungus was recovered at one-third of the original level it 28 d, and was still detected at 80 d. Cysts and motile zoospores were studied for mycoparasitic activity on water-agar films in vitro. Cysts germinated readily on colonies of F. oxysporum and Pythium aphanidermatum, and in the presence of spores of Idriella bolleyi, but poorly on colonies of F. culmorum, which seemed to produce an inhibitor. Motile zoospores were not attracted to phyphae but if they encysted on hyphae they showed significant germ-tube emergence towards the host; pre-encysted spores germinated with random orientation. A higher incidence of parasitism from motile spores than from cysts indicated a need for anchorage (adhesion during encystment) in the conditions of the assays, implicating mechanical pressure in mycoparasitism. Sporelings needed to grow some distance (about 30 mu-m) before they parasitized efficiently; this might involve transition from a germ-tube to a vegetative hypha, because it was similar to the maximum growth (26-27 mu-m) from cysts at water potentials that inhibited hyphal growth. These findings extend previous work on zoospore behaviour in Pythium and Phytophthora spp.

Order PDF Full Text

Close
Close

Click here to order any other PDF Full Text


Accession: 002763659

DOI: 10.1016/s0953-7562(09)80787-9

PDF Full Text: Behaviour of zoospore cysts of the mycoparasite Pythium oligandrum in relation to their potential for biocontrol of plant pathogens


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Other references

Mckinnon, W.C.; Greenblatt, M.S.; Guttmacher, A.E.; Yandell, D.W., 1995: The familial cancer program A multidisciplinary approach to understanding the role of genetics in cancer. American Journal of Human Genetics 57(4 SUPPL ): A348

Nakkeeran, N., 2013: Unregulated private health care in India: the case of a Kolkata hospital fire. Indian Journal of Public Health 56(3): 246-247

Himme, M. van; Stryckers, J.; Bulcke, R., 1977: Application of persistent herbicides over many years: overall treatments under dwarf apple trees. From 1958 to 1976 simazine and atrazine were applied alone at 4 kg/ha or in mixtures at 2 kg/ha + paraquat at 1 kg/ha or aminotriazole (as Amitrol-T) at 2 kg/ha; paraquat and aminotriazole were also applied + diuron at 2 kg/ha and Amitrol-T was ap...

Broker, Stephen P., 2004: Common raven breeding at West Rock Ridge during 2003. Connecticut Warbler. July; 243: 74-95

Tsuru Sinya, 1970: On the components of marine microorganisms near Miho bay and Oki islands. Bacteria, distribution and character, heterotrophic forms, preliminary survey bearing on geochemical role, Japan.

Mueller, S.; Brown, R.J.o, 1982: The control of cellulose microfibril deposition in the cell wall of higher plants. II. Freeze-fracture microfibril patterns in maize seeding tissues following experimental alteration with colchicine and ethylene Zea mays. Planta 54(6): 501-505

Raynaud, J.; Varene, P.; Jacquemin, C.; Gascard, J.P.; Lassarre, C., 1971: Heat exchange and global energetic balance during exercise in high altitudes. Journal de Physiologie 63(6): 273a-274a

Turner, B.J.; Duvernell, D.D.; Bunt, T.M.; Barton, M.G., 2008: Reproductive isolation among endemic pupfishes Cyprinodon on San Salvador Island, Bahamas microsatellite evidence. Three pupfish (Cyprinodon) morphotypes (two endemic) occur in some of the young (6000 ypb) saline lakes on the Bahamian island of San Salvador. The 'normal' morph, a detritivore/omnivore, is not different in its general features from Cyp...

Craig Mitchell; Kimball Mindy; Lienkaemper J., 2006: Near-surface geophysical surveying of east San Francisco Bay faults. Seismological Research Letters 77(2): 202-203

Dorogan, R.V.; Rapoport, E.N., 1965: Effects of functional changes in the thyroid on the biocurrents in the hypothalamus Proceedings of the Scientific Conference on the Problems of Physiology and pathology of cortico-visceral interrelations and functions of systems in the organism. The total bioelectrical activity in the posterior part of the hypothalamus in puppies was somewhat higher than in the anterior part in most of 1.5-6 month-old animals. The basic spontaneous activity was represented by beta- and gamma-rhythms. Hype...