Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 31 - 31.3 - Concept Check: 2

Answer

Mycorrhizae greatly improve plants’ ability to absorb soil mineral nutrients which are required for growth and development today, and this would have been especially important for the first land plants which lacked true roots and were therefore even less able to absorb soil nutrients. The evidence for early mycorrhizal associations comes from the fossil record of some of the earliest land plants and also from genetic work in which the transfer of genes for mycorrhiza formation from primitive liverworts to advanced flowering plants allowed the latter to form mycorrhizae, showing that those genes must have been present in the most primitive of land plants.

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