Pecan Rosette, Its Histology, Cytology, And Relation to Other Chlorotic Diseases
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In our eReader you can find the full English version of the book. Read Pecan Rosette, Its Histology, Cytology, And Relation to Other Chlorotic Diseases Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Pecan Rosette, Its Histology, Cytology, And Relation to Other Chlorotic Diseases
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The deposition of crystal aggregates of calcium oxalate is char- acteristic of pecan leaves (PI. VII, fig. B). These crystals begin to form in giant binucleate cells of the palisade just after the young leaf emerges from the bud. Finally the protoplasmic contents dis- appear, and the crystal aggregate nearly fills the cell. These crystal aggregates are distributed with considerable regularity in the healthy leaf and in the majority of cases one to each vein islet (PI. X, fig. E).
In the yellow ...spots of the secondary stage of the disease, on the other hand, their formation and distribution vary widely. At the focal centers in severe cases few or no crystals at ail are formed, whereas in the surrounding green parts they are often far more numerous and sometimes larger than in the comparable healthy leaf.
Averaging a large number of counts in cross sections of green parts of diseased and normal leaves of the Frotscher variety col- lected at Thomasville, Ga., it was found that in the normal leaves 20 crystal aggregates occurred to every 100 vein islets observed in section, while in the diseased leaves 60 crystal aggregates were found to every 100 vein islets.
What to read after Pecan Rosette, Its Histology, Cytology, And Relation to Other Chlorotic Diseases?
You can find similar books in the "Read Also" column, or choose other free books by Rand, Frederick Vernon, 1883-1961 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The deposition of crystal aggregates of calcium oxalate is char- acteristic of pecan leaves (PI. VII, fig. B). These crystals begin to form in giant binucleate cells of the palisade just after the young leaf emerges from the bud. Finally the protoplasmic contents dis- appear, and the crystal aggregate nearly fills the cell. These crystal aggregates are distributed with considerable regularity in the healthy leaf and in the majority of cases one to each vein islet (PI. X, fig. E).
In the yellow ...spots of the secondary stage of the disease, on the other hand, their formation and distribution vary widely. At the focal centers in severe cases few or no crystals at ail are formed, whereas in the surrounding green parts they are often far more numerous and sometimes larger than in the comparable healthy leaf.
Averaging a large number of counts in cross sections of green parts of diseased and normal leaves of the Frotscher variety col- lected at Thomasville, Ga., it was found that in the normal leaves 20 crystal aggregates occurred to every 100 vein islets observed in section, while in the diseased leaves 60 crystal aggregates were found to every 100 vein islets.
What to read after Pecan Rosette, Its Histology, Cytology, And Relation to Other Chlorotic Diseases?
You can find similar books in the "Read Also" column, or choose other free books by Rand, Frederick Vernon, 1883-1961 to read onlineMoreLess
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