Nibbled? No Problem

Making extra copies of their genomes allows some plants to better withstand damage.

Ashley P. Taylor
Jan 31, 2015

DAMAGE CONTROL: A previously damaged Arabidopsis thaliana plant has regrown with multiple stems, a common response to herbivory. COURTESY OF DANIEL SCHOLES

EDITOR'S CHOICE IN GENETICS & GENOMICS

The paper
D.R. Scholes, K.N. Paige, “Plasticity in ploidy underlies plant fitness compensation to herbivore damage,” Mol Ecol, 23:4862-70, 2014.

The bite
You might expect that a plant would respond unfavorably to having its top bitten off by an herbivore. But as ecologist Ken Paige and colleagues at the University of Illinois at Urbana-Champaign first observed in the 1980s, some plants respond by making more seeds, ultimately benefiting from injury in a phenomenon called overcompensation. More recently, Paige and postdoc Daniel Scholes suspected a role for endoreduplication, in which a cell makes extra copies of its genome without dividing, multiplying its number of chromosome sets, or “ploidy.”

The response
Undamaged plants tend to increase their ploidy over time, but after experimental...