Biology: The Dynamic Science (Mind...

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



Biology: The Dynamic Science (Mind...

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

Discuss Concepts In A. thaliana plants carrying a mutation called pickle (pkl), the primary root meristem retains characteristics of embryonic tissue—it spontaneously regenerates new embryos that can grow into mature plants. However, when the mutant root tissue is exposed to a gibberellin (GA), this abnormal developmental condition is suppressed. Explain why this finding suggests that additional research is needed on the fundamental biological role of GA.

Summary Introduction

To review:

The reason for the requirement of additional research on the fundamental biological roles of GA (gibberellins) based on its role in Arabidopsis thalliana.


In the given study, a pickle (pkl) mutation is present in Arabidopsis thaliana plant. This mutation results in the retention of embryonic tissue in the primary root meristem. It was observed that on exposure to gibberellins the mutant root tissue does not spontaneously generate new embryos, which were earlier capable of growing into new plants.


The repression of embryonic developmental activity in mutant plants is observed because the LEC1 gene is repressed by the pkl gene. This results in limited development of meristematic tissue present in the leaves. In the culture condition, the mutant is capable of producing somatic embryos. Upon introduction of gibberellins, this ability is repressed.

Gibberellins are growth regulators that are known to affect the development of shoot and promote development transitions, like flowering...

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

Why isn’t there an eclipse at every new moon and at every full moon?

Horizons: Exploring the Universe (MindTap Course List)

Complementary and alternative medicines (CAM) warrant a cautious approach: this treatments often lack evidence ...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

Two ponies of equal mass are initially at diametrically opposite points on the rim of a large horizontal turnta...

Physics for Scientists and Engineers, Technology Update (No access codes included)