Question

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.

Answer 1

A)The transgenic plants expressing the SHORTROOT gene from the SCARECROW promoter which has root that is shorter than wild type. The transgenic plants expressing AB14 under the control of the SCR promoter which is manifested as short root phenotype. Such results commonly suggests that the SCR has SHR independent role in migrating the sugar response which is important factor for root growth. In both the SHR and SCR, the stem cells niche is depleted which results in plants which substancially have shorter roots than that of wild type.

B). The type of plants that have been genetically engineered and a breeding approach which uses the recombinant techniques of dna to create plants with new characteristics. It has a radial pattern due to the concentric arrangement of single layer cells of epidermis, cortex, endodermis and pericycle.