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Excerpt from A Study of Reciprocal CrossesAs regards the nourishment of the tubes, it is known that there are two probable sources of food. The pollen grains contain some elements for nourishment, and the conductive tissue is not entirely without food. From chemical analyses it has been shown that pollen cells contain a certain amount of nutritive material such as starch

Title : A Study of Reciprocal Crosses (Classic Reprint)
Author : Marshall Baxter Cummings
Language : en
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Type : PDF, ePub, Kindle
Uploaded : Apr 07, 2021

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