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

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

A NATO complicated examine Institute on "Active Defence Mechanisms in crops" used to be held at Cape Sounion, Greece, 21 April - three may possibly 1981. It succeeded the same Institute held at Porte Conte, Sardinia in 1975 on "Specificity in Plant ailments. " What are energetic defence mechanisms within the context of plant ailment during which a plant, the host, could be broken through a pathogen? Defence mechanisms include homes of the host that lessen this harm. The mechanisms are passive once they are self sustaining of the pathogen. they're lively after they stick with adjustments within the host attributable to the pathogen. hence for a fungal pathogen, mobilephone partitions of a better plant that are lignified sooner than an infection will be a passive defence mechanism in the event that they reduced harm by way of impeding progress of the fungus. mobile partitions identified to develop into lignified as a reaction to the pathogen will be an energetic defence mechanism if it have been verified that this reaction lowered harm. The papers and discussions at this complex learn Institute have been approximately lively defence mechanisms in larger crops, often econo­ mically very important 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 if crops generally develop in shut organization with a wide selection of fungi and micro organism, usually of sorts that may be pathogens, they hardly ever develop into diseased, at the least now not sufficiently so one can allure notice.

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Of-> ... ," " ,, ;::1. 10 o 10 20 40 .... ·· ..... . 4 E ;::1. 0 ::s s::: ..... o of-> ttl of-> III 20 ~ Ql of-> U S- 30 ..... 6 Ql of-> ".. 1. ____ ... _____ ... 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.

E. adapted, hyphae also resumed growth and appeared to grow quite normally. However, in the present context, it is extremely important to realize that, in those experiments, growth only occurred when the amount of phytoalexin available to the fungus was reduced by, for example, metabolism in advance of mycelia on agar media or adsorption on to mycelial inocula in liquid media. While the concentrations of PHYSIOLOGICAL AND BIOCHEMICAL EVENTS 45 phytoalexins were maintained, as they were in resistant tissues, growth of surviving hyphae remained inhibited.

He concluded that in incompatible interactions the sheath may act as a barrier to nutrient uptake. In addition it may be possible, through the use of labelled precursors, to use micro-autoradiography to locate with precision the cellular or subcellular sites of phytoalexin synthesis and accumulation. Freeze etching (10), the last of the techniques listed, is not analytical in the same way as those discussed above. It is included here, however, because it could provide interesting insights into cellular changes occurring during active defence processes.

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