. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. MYCODOMATIA OF THK ALDEIl, KTC. 101 provisionally distiiiLiuished as Frankia alni (Wor.) on alder, and Frankia Brunchorstii (Moll.) on Mi/rim Gale. Hiltner/ after a series of experiments, states that first-year alders without tnbercles do not thrive in soil free from nitrogen, nor do they take up nitrogen from the atmosphere; when, liowever, provided with root-tubercles they assimilate nitrogen
. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. MYCODOMATIA OF THK ALDEIl, KTC. 101 provisionally distiiiLiuished as Frankia alni (Wor.) on alder, and Frankia Brunchorstii (Moll.) on Mi/rim Gale. Hiltner/ after a series of experiments, states that first-year alders without tnbercles do not thrive in soil free from nitrogen, nor do they take up nitrogen from the atmosphere; when, liowever, provided with root-tubercles they assimilate nitrogen. The tubercles also functionate in water, and soil rich in nitrogen lias the att'ect of slightly increasing the assimilation of that element. The tubercle-fungus is at first parasitic on the alder, and is only of use to the plant after the tubercles have fully developed. Mycodomatia of the Leguminosae. All Legumint)sae growing in their native soils exhibit the so-called tuljercles. These are accessory formations of the primary root-riiul and are furnished witli vascular liundles connected with the ro(tt- bundles ; they consist of a cortex of normal cells surrounding an inner large-celled parenchyma with turbid cell-contents con- sisting of numbers of bacteria, {Bacterium radicola, Beyerink, or RMzobinm Icguminos- amm, Frank.) - Frank describes minutely the formation of these tubercles.^ The short rod-shaped microbe forces its way into a root-hair or epidermal cell, multiplies there, and is conducted to the inner cortical cells by plasma-threads continuous through the (x'll-walls. A rapid division of the innt-r cortical cells is set u]), till a tubercle is formed, which may still further increase by continued cell-division from a meristem at its apex. The bacteria multiply simul- taneously, and are transferred into thi' great change comes over most of them. â l-l. â nii,:olH /,;;.â¢â,- iiimaroii. Uoot-tulx.'ivli.'S ii (â¢'iiiigdi tincloi-Ui. (v. TiOx'uf ) ne
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897
