A latitudinal gradient in herbivore resistance in common sunflower, Helianthus annuus (Asteraceae)
Background and aims – The intensity of herbivory is expected to decline with increasing latitude. As herbivory varies spatially and over time, a reliable method of assessing the intensity of herbivory is to examine the degree of herbivore resistance in the plant community. Latitudinal gradients in r...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Meise Botanic Garden
2020-07-01
|
| Series: | Plant Ecology and Evolution |
| Subjects: | |
| Online Access: | https://plecevo.eu/article/24605/download/pdf/ |
| _version_ | 1797421563112325120 |
|---|---|
| author | Laura Beaton |
| author_facet | Laura Beaton |
| author_sort | Laura Beaton |
| collection | DOAJ |
| description | Background and aims – The intensity of herbivory is expected to decline with increasing latitude. As herbivory varies spatially and over time, a reliable method of assessing the intensity of herbivory is to examine the degree of herbivore resistance in the plant community. Latitudinal gradients in resistance to herbivory were examined in wild populations of common sunflower, Helianthus annuus. Materials and methods – Seeds from 23 different latitudes, ranging from 20 to 44°N, were obtained from the USDA’s Germplasm Resources Information Network. Plants were grown in a greenhouse for nine weeks. At that time, the size (height, leaf length, number of leaves) and resistance of each plant to herbivory (determined through a bioassay using a generalist herbivore, Helicoverpa zea was assessed. Key results – Resistance to herbivory decreased significantly with latitude, while plant size, as indicated by height, was positively correlated with latitude and negatively correlated with both temperature and resistance to herbivory.Conclusion – Populations from lower latitudes exhibited elevated resistance to herbivory and slower growth, suggesting first, that herbivory is more intense at lower latitudes and second, that there is a tradeoff between growth and defense. |
| first_indexed | 2024-03-09T07:19:20Z |
| format | Article |
| id | doaj.art-d633311d4d324c01a7030b703a8e286b |
| institution | Directory Open Access Journal |
| issn | 2032-3921 |
| language | English |
| last_indexed | 2024-03-09T07:19:20Z |
| publishDate | 2020-07-01 |
| publisher | Meise Botanic Garden |
| record_format | Article |
| series | Plant Ecology and Evolution |
| spelling | doaj.art-d633311d4d324c01a7030b703a8e286b2023-12-03T07:56:19ZengMeise Botanic GardenPlant Ecology and Evolution2032-39212020-07-01153219920710.5091/plecevo.2020.171124605A latitudinal gradient in herbivore resistance in common sunflower, Helianthus annuus (Asteraceae)Laura Beaton0Department of Biology, York College, CUNY 94-20 Guy R. Brewer Blvd, Jamaica, NY 11563Background and aims – The intensity of herbivory is expected to decline with increasing latitude. As herbivory varies spatially and over time, a reliable method of assessing the intensity of herbivory is to examine the degree of herbivore resistance in the plant community. Latitudinal gradients in resistance to herbivory were examined in wild populations of common sunflower, Helianthus annuus. Materials and methods – Seeds from 23 different latitudes, ranging from 20 to 44°N, were obtained from the USDA’s Germplasm Resources Information Network. Plants were grown in a greenhouse for nine weeks. At that time, the size (height, leaf length, number of leaves) and resistance of each plant to herbivory (determined through a bioassay using a generalist herbivore, Helicoverpa zea was assessed. Key results – Resistance to herbivory decreased significantly with latitude, while plant size, as indicated by height, was positively correlated with latitude and negatively correlated with both temperature and resistance to herbivory.Conclusion – Populations from lower latitudes exhibited elevated resistance to herbivory and slower growth, suggesting first, that herbivory is more intense at lower latitudes and second, that there is a tradeoff between growth and defense.https://plecevo.eu/article/24605/download/pdf/common sunflowerHelianthus annuusHelicoverpa z |
| spellingShingle | Laura Beaton A latitudinal gradient in herbivore resistance in common sunflower, Helianthus annuus (Asteraceae) Plant Ecology and Evolution common sunflower Helianthus annuus Helicoverpa z |
| title | A latitudinal gradient in herbivore resistance in common sunflower, Helianthus annuus (Asteraceae) |
| title_full | A latitudinal gradient in herbivore resistance in common sunflower, Helianthus annuus (Asteraceae) |
| title_fullStr | A latitudinal gradient in herbivore resistance in common sunflower, Helianthus annuus (Asteraceae) |
| title_full_unstemmed | A latitudinal gradient in herbivore resistance in common sunflower, Helianthus annuus (Asteraceae) |
| title_short | A latitudinal gradient in herbivore resistance in common sunflower, Helianthus annuus (Asteraceae) |
| title_sort | latitudinal gradient in herbivore resistance in common sunflower helianthus annuus asteraceae |
| topic | common sunflower Helianthus annuus Helicoverpa z |
| url | https://plecevo.eu/article/24605/download/pdf/ |
| work_keys_str_mv | AT laurabeaton alatitudinalgradientinherbivoreresistanceincommonsunflowerhelianthusannuusasteraceae AT laurabeaton latitudinalgradientinherbivoreresistanceincommonsunflowerhelianthusannuusasteraceae |