Susceptibility of faba bean (Vicia faba L.) to heat stress during floral development and anthesis

Bishop, J. ORCID: https://orcid.org/0000-0003-2114-230X, Potts, S. G. ORCID: https://orcid.org/0000-0002-2045-980X and Jones, H. E. (2016) Susceptibility of faba bean (Vicia faba L.) to heat stress during floral development and anthesis. Journal of Agronomy and Crop Science, 202 (6). pp. 508-517. ISSN 1439-037X doi: 10.1111/jac.12172

Abstract/Summary

Experiments were conducted over two years to quantify the response of faba bean (Vicia faba L.) to heat stress. Potted winter faba bean plants (cv. Wizard) were exposed to temperature treatments (18/10; 22/14; 26/18; 30/22; 34/26°C day/night) for five days during floral development and anthesis. Developmental stages of all flowers were scored prior to stress, plants were grown in exclusion from insect pollinators to prevent pollen movement between flowers, and yield was harvested at an individual pod scale, enabling effects of heat stress to be investigated at a high resolution. Susceptibility to stress differed between floral stages, flowers were most affected during initial green-bud stages. Yield and pollen germination of flowers present before stress showed threshold relationships to stress, with lethal temperatures (t50) ~28°C and ~32°C, while whole plant yield showed a linear negative relationship to stress with high plasticity in yield allocation, such that yield lost at lower nodes was partially compensated at higher nodal positions. Faba bean has many beneficial attributes for sustainable modern cropping systems but these results suggest that yield will be limited by projected climate change, necessitating the development of heat tolerant cultivars, or improved resilience by other mechanisms such as earlier flowering times.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/57692
Identification Number/DOI	10.1111/jac.12172
Refereed	Yes
Divisions	Interdisciplinary centres and themes > Centre for Food Security Life Sciences > School of Agriculture, Policy and Development > Department of Sustainable Land Management > Centre for Agri-environmental Research (CAER) Life Sciences > School of Agriculture, Policy and Development > Department of Crop Science
Publisher	Wiley
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