Plant Tolerance: A Unique Approach to Control Hemipteran Pests.
Plant tolerance to insect pests has been indicated to be a unique category of resistance, however, very little information is available on the mechanism of tolerance against insect pests. Tolerance is distinctive in terms of the plant's ability to withstand or recover from herbivore injury through growth and compensatory physiological processes. Because plant tolerance involves plant compensatory characteristics, the plant is able to harbor large numbers of herbivores without interfering with the insect pest's physiology or behavior. Some studies have observed that tolerant plants can compensate photosynthetically by avoiding feedback inhibition and impaired electron flow through photosystem II that occurs as a result of insect feeding. Similarly, the up-regulation of peroxidases and other oxidative enzymes during insect feeding, in conjunction with elevated levels of phytohormones can play an important role in providing plant tolerance to insect pests. Hemipteran insects comprise some of the most economically important plant pests (e.g., aphids, whiteflies), due to their ability to achieve high population growth and their potential to transmit plant viruses. In this review, results from studies on plant tolerance to hemipterans are summarized, and potential models to understand tolerance are presented.
Department of Entomology, University of Nebraska-Lincoln, Lincoln NE, USA.
Kyle G
KG
Koch
Department of Entomology, University of Nebraska-Lincoln, Lincoln NE, USA.
Kaitlin
K
Chapman
Department of Entomology, University of Nebraska-Lincoln, LincolnNE, USA; Department of Biochemistry, University of Nebraska-Lincoln, LincolnNE, USA.
Joe
J
Louis
Department of Entomology, University of Nebraska-Lincoln, Lincoln NE, USA.
Tiffany
T
Heng-Moss
Department of Entomology, University of Nebraska-Lincoln, LincolnNE, USA; Grain, Forage, and Bioenergy Research Unit, United States Department of Agriculture - Agricultural Research Service, LincolnNE, USA.
Gautam
G
Sarath
ROS; constitutive; hemipteran pests; inducible; model; plant tolerance; susceptibility
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