Floral nectar and other reward facilitate crop pollination, and in so doing, increase the amount and breadth of food available for humans. Though abundance and diversity of pollinators (particularly bees) have declined over the past several decades, a concomitant increase in reliance on pollinators presents a challenge to food production. Development of crop varieties with specific nectar or nectar-related traits to attract and retain pollinating insects is an appealing strategy to help address needs of agriculture and pollinators for several reasons. First, many crops have specific traits which have been identified to enhance crop–pollinator interactions. Also, an improved understanding of mechanisms that govern nectar-related traits suggest simplified phenotyping and breeding are possible. Finally, the use of nectar-related traits to enhance crop pollination should complement other measures promoting pollinators and will not limit options for crop production or require any changes by growers (other than planting varieties that are more attractive or rewarding to pollinators). In this article, we review the rationale for improving crop-pollinator interactions, the effects of specific plant traits on pollinator species, and use cultivated sunflowers as a case study. Recent research in sunflower has (i) associated variation in bee visitation with specific floral traits, (ii) quantified benefits of pollinators to hybrid yields, and (iii) used genetic resources in sunflower and other plants to find markers associated with key floral traits. Forthcoming work to increase pollinator rewards should enable sunflower to act as a model for using nectar-related traits to enhance crop–pollinator interactions.
Bibliographical noteFunding Information:
This publication was supported by the USDA Agricultural Research Service Long-Term Agroecosystem Research (LTAR) Network. Portions of this work also report previously unpublished data supported by a grant from the National Science Foundation (1339246 to CC).
This publication was supported by the USDAAgricultural Research Service Long-Term Agroecosystem Research (LTAR) Network. Portions of this work also report previously unpublished data supported by a grant from the National Science Foundation (1339246 to CC).We appreciate early project leadership by Bill Kemp and Matt Sanderson (both USDA-ARS, retired), collaborations in field trials with Jeff Bradshaw (University of Nebraska) and Adam Varenhorst (South Dakota State University), and work finding SNP markers associated with nectar-related traits by Qing-Ming Gao (USDA-ARS) and Stephan Reinert (University of Colorado).
© 2018 Prasifka, Mallinger, Portlas, Hulke, Fugate, Paradis, Hampton and Carter.
- Ecosystem services