By R. Heitefuss (auth.), R. K. S. Wood (eds.)

ISBN-10: 1461583098

ISBN-13: 9781461583097

ISBN-10: 146158311X

ISBN-13: 9781461583110

A NATO complicated examine Institute on "Active Defence Mechanisms in crops" used to be held at Cape Sounion, Greece, 21 April - three could 1981. It succeeded an analogous Institute held at Porte Conte, Sardinia in 1975 on "Specificity in Plant ailments. " What are lively defence mechanisms within the context of plant illness during which a plant, the host, could be broken via a pathogen? Defence mechanisms contain homes of the host that lessen this harm. The mechanisms are passive once they are self sufficient of the pathogen. they're lively after they persist with adjustments within the host attributable to the pathogen. hence for a fungal pathogen, mobilephone partitions of a better plant that are lignified prior to an infection will be a passive defence mechanism in the event that they diminished harm through impeding development of the fungus. phone partitions identified to turn into lignified as a reaction to the pathogen will be an energetic defence mechanism if it have been tested that this reaction reduced harm. The papers and discussions at this complex learn Institute have been approximately energetic defence mechanisms in larger crops, more often than not econo­ mically vital crop crops, opposed to fungi, micro organism and viruses as pathogens. Taking the microorganisms first it's a truism yet person who bears repeating that even supposing vegetation in most cases develop in shut organization with a wide selection of fungi and micro organism, usually of sorts that may be pathogens, they infrequently turn into diseased, at the very least now not sufficiently with the intention to allure notice.

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Maintaining infected hypcotyls at 160 C for 72 hours prior to transfer allowed sufficient hyphal growth to occur such that further hypha~ developmen5 could be measured. Thus, when hypocotyls were transferred to 25 C the pattern of hyphal growth could be compared with the onset of host cell death and of phytoalexin accumulation. The results which were obtained are summarized in Fig. 5 hours after transfer to 25 0 C the infected cells were granular and contained slight visible pigmentation, suggesting that the process of cell death had originated several hours earlier.

S:::. 0.. o Incubation at 25°C (h) Figure I. Temporal relationships between necrosis, accumulation of phytoalexins and inhibition of fungal growth Hypocotyls of P. vuZgaris, cv. Kievitsboon Koekoek were inoculated with C. Zindemuthianum, incubated at 160 C for o 72 hours and transferred to 25 C. Infected cell death, phytoalexin concentration and length of intracellular hyphae were measured. BAILEY Another critical approach necessary in order that firm conclusions may be drawn is to compare the physiological and biochemical effects of phytoalexins on fungal hyphae in vit~o with the state of fungus in resistant plant cells.

Quite small conformational changes in membranes can be detected, and herein lies its possible value for active defence studies, both in the characterisation of recognition events and of the disorganisation of membranes during cell death. In conclusion it is important to emphasise that all the techniques referred to above have their limitations, especially the problem of specificity, the problem of fixation of soluble substance's and, arising from these two, the problem of interpretation. These fimitations cannot be overemphasised, but they can be surmounted (a) by development and application of the techniques of cryofixation (7) and (b) through experience of their wider application in plant pathology.

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Active Defense Mechanisms in Plants by R. Heitefuss (auth.), R. K. S. Wood (eds.)


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