Plant Resistance to Insects Attacking Corn and Grain Sorghum

1990 ◽  
Vol 73 (3) ◽  
pp. 446 ◽  
Author(s):  
B. R. Wiseman ◽  
F. M. Davis
Keyword(s):  
Plant Resistance ◽  
Grain Sorghum ◽  
Resistance To Insects ◽  
Plant Resistance To Insects

Growth Inhibitors in Host Plant Resistance to Insects: Examples from a wild tomato with Heliothis zea (Lepidoptera: Noctuidae)

1990 ◽  
Vol 25 (1) ◽  
pp. 46-56 ◽  
Author(s):  
Robert R. Farrar ◽  
George G. Kennedy
Keyword(s):  
Chlorogenic Acid ◽  
Host Plant ◽  
Plant Resistance ◽  
Host Plant Resistance ◽  
Heliothis Zea ◽  
Biological Significance ◽  
Developmental Time ◽  
Growth Inhibitors ◽  
Resistance To Insects ◽  
Plant Resistance To Insects

Non-lethal, growth inhibiting allelochemicals have potential roles in host plant resistance to insects because they can extend the time the insects are exposed to other mortality factors. Four chemical constituents of the wild tomato, Lycopersicon hirsutum f. glabratum, PI 134417 were evaluated in artificial diet as growth inhibitors to Heliothis zea (Boddie): alpha-tomatine, chlorogenic acid, beta-caryophyllene and alpha-humulene. All caused small increases in developmental time, and, except for chlorogenic acid, small decreases in pupal weight. These changes may be too small to be of biological significance in host plant resistance. Our results suggest that the usual method of evaluating growth inhibitors, which is to weigh the insects after a fixed feeding period, is inadequate to assess the biological significance of any observed growth inhibitory effects. Because differences in weight after fixed feeding periods do not always translate into equivalent changes in developmental time or final weight, measurement of actual developmental time may be more appropriate.

Plant Resistance to Insects.

1985 ◽  
Vol 22 (1) ◽  
pp. 300
Author(s):  
S. Garsed ◽  
P. A. Hedin
Keyword(s):  
Plant Resistance ◽  
Resistance To Insects ◽  
Plant Resistance To Insects

scholarly journals Organic management promotes natural pest control through enhanced plant resistance to insects

2019 ◽  
Author(s):  
Robert Blundell ◽  
Jennifer E. Schmidt ◽  
Alexandria Igwe ◽  
Andrea L. Cheung ◽  
Rachel L. Vannette ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Plant Resistance ◽  
Insect Pest ◽  
Organic Soil ◽  
Soil Microbiome ◽  
Organic Systems ◽  
Resistance To Insects ◽  
Plant Resistance To Insects ◽  
Salicylic Acid Accumulation ◽  
Natural Pest Control

AbstractLower insect pest populations found on long-term organic farms have largely been attributed to increased biodiversity and abundance of beneficial predators. However, potential induction of plant defenses has largely been ignored. This study aims to determine whether host plant resistance mediates decreased pest populations in organic systems, and to identify the underpinning mechanisms. We demonstrate that greater numbers of leafhoppers (Circulifer tenellus) settle on tomatoes (Solanum lycopersicum) grown using conventional management as compared to organic. Soil microbiome sequencing, chemical analysis, and transgenic approaches, coupled with multi-model inference, suggest that changes in leafhopper settling between organically and conventionally-grown tomatoes are dependent on salicylic acid accumulation in the plant, likely mediated by rhizosphere microbial communities. These results suggest that organically-managed soils and microbial communities may play an unappreciated role in reducing plant attractiveness to pests by increasing plant resistance.

Sign in / Sign up

Export Citation Format

Share Document