A group of researchers wanted to determine how leaf herbivory and seed production of a legume plant (legumes are a family of plants which includes beans and lentils) were affected by the presence of its mutualistic rhizobia (a group of nitrogen-fixing bacteria). They designed an experiment with two treatments: (1) rhizobia absent and herbivores present and (2) rhizobia present and herbivores present. Provide two additional treatments and briefly explain how they would contribute to our understanding of the results of this experiment.

A group of researchers wanted to determine how leaf herbivory and seed production of a legume plant (legumes are a family of plants which includes beans and lentils) were affected by the presence of its mutualistic rhizobia (a group of nitrogen-fixing bacteria). They designed an experiment with two treatments: (1) rhizobia absent and herbivores present and (2) rhizobia present and herbivores present. Provide two additional treatments and briefly explain how they would contribute to our understanding of the results of this experiment.

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter54: Community Ecology

Section: Chapter Questions

Problem 14TYU: Many plants that produce nodules for nitrogen-fixing bacteria are common on disturbed sites. Explain...

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How do the nitrogen-fixing genera Azospirillum and Rhizobium associate with plant roots? Rhizobium stays on the outside of the roots of tropical grasses, while Azospirillum grows inside the roots of legumes. Azospirillum and Rhizobium both stay on the outside of roots. Azospirillum stays on the outside of the roots of tropical grasses, while Rhizobium grows inside the roots of legumes. Azospirillum and Rhizobium both grow inside specialized root cells.
Many plants that produce nodules for nitrogen-fixing bacteria are common on disturbed sites. Explain how these plants might simultaneously compete with and facilitate other plant species.
One of the most widely known symbioses between microorganisms and plants is that of rhizobia and legumes. The basis of this mutualistic, symbiotic relationship can be described by which of the following statements? Actually, all of these are accurate descriptions of the symbiosis between rhizobia and plants. Rhizobia help the plants expand access to minerals in the soil while the plant protects the rhizobia from predators and viruses. The rhizobia will conduct photosynthesis which allow the plants to access carbon without having to deplete their own energy to do carbon fixation. The rhizobia fix nitrogen for the plant while the plant fixes carbon which it shares with the rhizobia. The rhizobia will produce oxygen which will help the soil to maintain oxygenation and thus avoid pathogens.
you have isolated a Bacillus species and would like to test its plant growth promoting abilities. other than nitrogen fixation and ACC deaminase production, discuss three other traits that you would look for and their significance in promoting plant growth.
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