Factors Influencing the Pathogenicity of Helminthosporium Sativum
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48 1 6 Leaves and agar 28 C.
27 . 16 + o . 45 60 9. 34 0. 52 18 These facts show that in a single spore strain of a Helnuntho- sporium of this type, marked variations may be found in the length of spores developed under various conditions. Differences in spore measurements by various authors are therefore to be expected, and very fine specific or varietal differences can not be drawn on, the basis of spore size unless a large number of carefully controlled compara- tive studies have been made. ...Seemingly, the original spore meas- urements given by Pammel, King and Bakke are rather large (105 to 130 microns). Stevens has come nearest to approaching this length with a maximum of 122 microns. The same author states that the majority of his spores fall within 80 to 90 microns. By examining Table III it will be seen that the majority of the spores developed upon fresh barley leaves in a moist atmosphere fall within the 80 and 90 classes, or within 75. 0 to 94. 9 microns. Out of 4000 spores meas- ured, only 43.
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To quickly assess the difficulty of the text, read a short excerpt:
48 1 6 Leaves and agar 28 C.
27 . 16 + o . 45 60 9. 34 0. 52 18 These facts show that in a single spore strain of a Helnuntho- sporium of this type, marked variations may be found in the length of spores developed under various conditions. Differences in spore measurements by various authors are therefore to be expected, and very fine specific or varietal differences can not be drawn on, the basis of spore size unless a large number of carefully controlled compara- tive studies have been made. ...Seemingly, the original spore meas- urements given by Pammel, King and Bakke are rather large (105 to 130 microns). Stevens has come nearest to approaching this length with a maximum of 122 microns. The same author states that the majority of his spores fall within 80 to 90 microns. By examining Table III it will be seen that the majority of the spores developed upon fresh barley leaves in a moist atmosphere fall within the 80 and 90 classes, or within 75. 0 to 94. 9 microns. Out of 4000 spores meas- ured, only 43.
What to read after Factors Influencing the Pathogenicity of Helminthosporium Sativum?
You can find similar books in the "Read Also" column, or choose other free books by Louise Dosdall to read onlineMoreLess
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