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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Jennifer Nemhauser, Todd Mockler, and Joanne Chory at the Plant Biology Laboratory of the Salk Institute for Biological Studies per- formed experiments to learn more about the interaction of auxin and brassinosteroids (BR) in regulating the growth of Arabidopsis seedlings. In a 2004 research report on this work, graphics for displaying experimental data included the Venn diagram shown here (Figure). Venn diagrams are useful for giving a snapshot of the interrelation- ships between sets of data, often using overlapping circles. In this diagram, “up” and “down” refer to hormone effects that stimulateor inhibit gene expression. The numerals in each circle represent numbers of seedlings.

Chapter 37, Problem 3ITD, Jennifer Nemhauser, Todd Mockler, and Joanne Chory at the Plant Biology Laboratory of the Salk

FIGURE Venn diagram showing the overlap between Yucca genes responsive to auxin and BR.

Considering the two upper overlapping circles, what general finding do the data support?

Source: J. Nemhauser, T. Mockler, and J. Chory. 2004. Interdependency of brassinosteroids and auxin in Arabidopsis seedling growth. PLoS Biology 2:1460–1471. doi: 10.1371/journal.pbio.0020258

Summary Introduction

To review:

The reason for no overlapping between up and down bubble for each hormone.

Introduction:

In the given study, auxin and brassinosteroids are studied as the plant growth regulating hormones in Arabidopsis seed. A Venn diagram is used for representing the degree of overlap of auxin-responsive and BR-responsive genes, and the relative proportion of the two genes. In this case, the genes observed for the response of the two phytohormones are Yucca genes.

Explanation

The phytohormone brassinosteroids is a polyhydroxysteroid involved in stimulating cell elongation and division. It is also involved in stimulating differentiation of vascular tissues. Auxin hormone is essential for plant development, and it also stimulates cell division and elongation. The Yucca genes are responsible for encoding a flavin monooxygenase-like enzyme.

The Venn diagram represents that there is no overlap between the up and down bubbles of the auxin and BR genes...

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