A Contribution to the Physiology of the Genus Cuscuta
A Contribution to the Physiology of the Genus Cuscuta
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Longitudinal sections show plainly that many chloro- phyll-granules of very considerable size have been developed, and that their distribution is the reverse of that of the chromo- plastids above mentioned, since they are much more abundant in the cortical parenchyma than in the central cylinder. Their Digitized by VjOOQIC Physiology of the Genus Cuscuta. 8i localization in the more superficial and hence better illuminated cell-layers, rather than in the central and comparatively dark tissues, ...confirms the opinion that they are functional. I have not attempted any chemical experiments to determine the amount of oxygen evolved. It is to be noticed further that if, instead of cutting off only about six centimetres of the tip of each branch, the cutting be ten or more centimetres long, there is less development of chlorophyll and more growth in thickness of those parts which have coiled closely around the host ; and that, as the root and the lower parts of the stem of the seedling yielded the nutrient matters which they contained to the younger upper parts and died, so the lower parts of the cuttings decrease in size, shrivel, and die.
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To quickly assess the difficulty of the text, read a short excerpt:
Longitudinal sections show plainly that many chloro- phyll-granules of very considerable size have been developed, and that their distribution is the reverse of that of the chromo- plastids above mentioned, since they are much more abundant in the cortical parenchyma than in the central cylinder. Their Digitized by VjOOQIC Physiology of the Genus Cuscuta. 8i localization in the more superficial and hence better illuminated cell-layers, rather than in the central and comparatively dark tissues, ...confirms the opinion that they are functional. I have not attempted any chemical experiments to determine the amount of oxygen evolved. It is to be noticed further that if, instead of cutting off only about six centimetres of the tip of each branch, the cutting be ten or more centimetres long, there is less development of chlorophyll and more growth in thickness of those parts which have coiled closely around the host ; and that, as the root and the lower parts of the stem of the seedling yielded the nutrient matters which they contained to the younger upper parts and died, so the lower parts of the cuttings decrease in size, shrivel, and die.
What to read after A Contribution to the Physiology of the Genus Cuscuta?
You can find similar books in the "Read Also" column, or choose other free books by George James Peirce to read onlineMoreLess
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