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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

Strigolactones:

a. mainly interact with IAA to regulate apical dominance.

b. function only in roots, where they limit lateral branching.

c. counteract the effects of gibberellin in stimulating stemelongation.

d. attract fungal hyphae to roots and regulate lateral branching.

e. are major hormones in plant defenses.

Summary Introduction

Introduction:

Strigolactones are phytohormones that are only synthesized in the root cells. This hormone was first isolated from root secretions, which are responsible for promoting the seed germination of parasitic weed in Striga species.

Explanation

Justification/ Explanation for the correct answer:

Option (d) is given as: strigolactone attracts fungal hyphae to roots and regulates lateral branching. A study on pea plant and other plants showed that strigolactones released from the roots stimulated germination of spore of fungi. This resulted in the formation of fungal hyphae, which forms mycorrhizae on infecting the plant roots.

The strigolactone interacts with various other growth hormones, like cytokinins and auxin to modify the root and shoot development on change in environmental conditions. It is responsible for specifically regulating the lateral branching in both shoots and roots. Hence, option (d) is correct.

Explanation for the incorrect answers:

Option (a) is given as: strigolactone mainly interacts with IAA to regulate apical dominance. This hormone does not regulate apical dominance and interacts with cytokinin as well to regulate lateral branching...

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