A) Is a transgenic plant expressing the SHORTROOT gene from the SCARECROW promoter (pSCR:SHR) likely to...

A) Is a transgenic plant expressing the SHORTROOT gene from the SCARECROW promoter (pSCR:SHR) likely to have a root that is larger, smaller, or the same size as a wild-type root. Briefly justify your answer.

B) How would the pericycle, endodermis, cortex, and epidemis layers be arranged in this transgenic plant. Briefly justify your answer.

Expert Solution

Answer

Transgenic plants are plants that have been genetically engineered, a breeding approach that uses recombinant DNA techniques to create plants with new characteristics.They are identified as a class of genetically modified organism. . SHORT-ROOT and SCARECROW are key regulators of stem cell renewal and radial patterning in the root of Arabidopsis.

Sugar is essential for all cellular activities, but at high levels it inhibits growth and development.A potential mechanism for plants to orchestrate the sugar response and development is to regulate both processes with the same factors.SHORT-ROOT and SCARECROW are key regulators of root growth and development.They are both essential for the maintenance of the stem cell niche.

In shr and scr, the stem cell niche is depleted early resulting in plants with substantially shorter roots than the wild type. SHR and SCR also play an important role in radial patterning. In wild-type primary root, the ground tissue consists of two cell layers, the cortex and endodermis, which lie between the epidermis and the central vasculature or stele. SHR and SCR play a similar role in ground tissue patterning, they are expressed in different domains.

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