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Cytological studies of forms 9, 21, and 27 of Puccinia graminis tritici on Khapli emmer

, : Cytological studies of forms 9, 21, and 27 of Puccinia graminis tritici on Khapli emmer. Jour Agric Res 32(8): 701-725

The physiologic forms or races of wheat stem rust are similar morphologically but differ physiologically. Khapli emmer is about equally resistant to races 9, 21, and 27, but cytologic study of the infections shows differences in the interaction of host and parasite. Some of these are differences of degree rather than of kind. The 3 differ as to the percentage of fungi which effect an entry into the host and the amount of damage done to the guard cells through which entry takes place. In all 3 races of the rust, the first mesophyll cells attacked by the fungus are killed outright, and in all 3, a gradual change takes place, by which invaded host cells survive longer and show to some extent the stimulated condition present in infections on susceptible hosts. This adjustment is slow in race 21, medium in race 9 and rapid in race 27. Haustoria expand partly in older infections. Damage to haustorium mother cells is extreme in race 9, slight in 21 and absent in 27. Race 27 shows the greatest vegetative development and the least reproductive activity of the 3. In all older infections the tissues directly invaded by the fungus are in better condition than the tissues surrounding the infection. The extent and character of the damage done beyond the limits of the fungus differ markedly in the 3 cases. No one race is extreme in all respects, each being strong in some, moderate in others and weak in still others. The net result nearly balances, and the 3 races produce about the same grade of infection on Khapli.


Other references

Baronio, P.C.mpadelli, G., 1979: Biological cycle of Gonia cinerascens Rond. (Diptera, Tachinidae) reared on a substitute host Galleria mellonella L. (Lepidoptera, Galleriidae) in a controlled environment. Bollettino dell'Istituto di entomologia4(34): 35-54

Berthier, L.; Garrahan, J.P., 2006: Numerical study of a fragile three-dimensional kinetically constrained model. We numerically study the three-dimensional generalization of the kinetically constrained east model, the north-or-east-or-front (NEF) model. We characterize the equilibrium behavior of the NEF model in detail, measuring the temperature dependence...

Mikhailov, K.E., 1996: New genera of the fossil eggs from the Upper Cretaceous of Mongolia. A description is given of two new oogenera and oospecies, Oblongoolitus glaber and Parvoolithus tortuosus, which originate from the Khermiyn-Tsav and Khongil localities of the southern Mongolia.

Kneeshaw, M.F.; Considine, R.M.; Jennings, J., 1999: Mutuality and preparedness of family caregivers for elderly women after bypass surgery. The purposes of this study were to identify caregivers' feelings of mutuality and reported preparedness for caregiving at hospital discharge and to examine the relationship between these measures and the recovery outcomes of elderly women aft...

Roll Artur, 1951: Jurassic troughs and oil deposits in northwest Germany. The two crustal blocks distinguished in the northwest German basin are both composed of an extensive Mesozoic sedimentary sequence. Uplift, accompanied by salt-dome formation, and erosion of the northern block took place at the close of the Jurass...

Kosmal, A.; Malinowska, M.; Kowalska, D.M., 1995: Connections of the superior temporal cortex with the posterior thalamus and the amygdala in rhesus monkey. Acta Neurobiologiae Experimentalis (Warsaw) 55(SUPPL ): 61

Micka, J., 1948: Lactic fermentation and trace iron affect cracker quality. Abnormal increase in pH during baking is the result of (a) undesirable bacterial fermentation due to variations in the microbiological condition of the fermentation troughs, (b) effect on protein in dough of oxidation-reduction enzyme systems acti...

Front, D.; Israel, O.; Even-Sapir, E.; Feinsud, M., 1986: Superior sagittal sinus thrombosis: assessment with Tc-99m labeled red blood cells. The diagnostic value of scintigraphy with technetium-99m labeled red blood cells (Tc-RBC) was assessed in 19 patients with clinical suggestion of superior sagittal sinus thrombosis (SSST). Comparison of Tc-RBC static images with dynamic flow studi...

Bellinger, H., 1973: Technical problems of bed hygiene. Das Offentliche Gesundheitswesen 35: Suppl 2:90-6

Jansen, L.H., 1966: Skin disorders in malignant internal diseases, specifically acanthosis nigricans. Tijdschrift Voor Ziekenverpleging 19(6): 174-179