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Predict root cell auxin level

Q.

Auxin, a hormone involved in plant growth, is transported into a cell through auxin/H+ co-transporters (AUX) and out of a cell via carrier proteins called PINs that are located on the cell membrane. The graph shows the amount of auxin in a pea plant root cell over time.

A scientist is studying root cell growth in pea plants after they are infected by rhizobia bacteria. Before infection with rhizobia, auxin enters the root cell of the pea plant through AUX co-transporters at a standard rate. Once infection occurs, the rate of auxin transported into the root cell increases by 8 units/sec (i.e., “rhizobia infection”). After a while, the plant responds to the infection, causing the rate of auxin entering the root cell to decrease (i.e., plant response).

Which point(s) represents the likely amount of auxin that will be in the pea plant’s root cell at time X (after the plant responds to the infection)?

  • Point 1
  • Point 2
  • Point 3
  • Point 4
  • More than one point

Explain the reasoning behind your selection about the likely amount of auxin that will be in the pea plant’s root cell at time X (after the plant responds to the infection).

Audiences:

Undergraduate

Topics:

Mass balance,  Plant physiology,  Biology,  Physiology,  Physiology

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