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Role of cyanogenic glycosides in the seeds of wild lima bean, Phaseolus lunatus: defense, plant nutrition or both?

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Cyanogenic glycosides present in the seeds of wild lima bean plants are associated with seedling defense but do not affect seed germination and seedling growth.

Abstract

Wild lima bean plants contain cyanogenic glycosides (CNGs) that are known to defend the plant against leaf herbivores. However, seed feeders appear to be unaffected despite the high levels of CNGs in the seeds. We investigated a possible role of CNGs in seeds as nitrogen storage compounds that influence plant growth, as well as seedling resistance to herbivores. Using seeds from four different wild lima bean natural populations that are known to vary in CNG levels, we tested two non-mutually exclusive hypotheses: (1) seeds with higher levels of CNGs produce seedlings that are more resistant against generalist herbivores and, (2) seeds with higher levels of CNGs germinate faster and produce plants that exhibit better growth. Levels of CNGs in the seeds were negatively correlated with germination rates and not correlated with seedling growth. However, levels of CNGs increased significantly soon after germination and seeds with the highest CNG levels produced seedlings with higher CNG levels in cotyledons. Moreover, the growth rate of the generalist herbivore Spodoptera littoralis was lower in cotyledons with high-CNG levels. We conclude that CNGs in lima bean seeds do not play a role in seed germination and seedling growth, but are associated with seedling defense. Our results provide insight into the potential dual function of plant secondary metabolites as defense compounds and storage molecules for growth and development.

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Acknowledgements

We thank Ted Turlings and Adrienne Godschalx for their comments on an earlier version of this manuscript, and four anonymous reviewers for their many constructive comments that helped improved this manuscript. We also thank Martin Heil for many insightful discussions on lima bean that inspired some of this work. We are grateful to the Universidad del Mar of Puerto Escondido (Oaxaca, Mexico) for logistic support during fieldwork. This research was financially supported by the Swiss National Science Foundation (Project No. 3100AO-10923) awarded to BB.

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Correspondence to Betty Benrey.

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Cuny, M.A.C., La Forgia, D., Desurmont, G.A. et al. Role of cyanogenic glycosides in the seeds of wild lima bean, Phaseolus lunatus: defense, plant nutrition or both?. Planta 250, 1281–1292 (2019). https://doi.org/10.1007/s00425-019-03221-3

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  • DOI: https://doi.org/10.1007/s00425-019-03221-3

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