Photosynthetica, 2020 (vol. 58), 1

Photosynthetica 2020, 58(1):37-44 | DOI: 10.32615/ps.2019.137

Ultraviolet (UV) B effects on growth and yield of three contrasting sweet potato cultivars

Z. CHEN1, W. GAO1,2, K.R. REDDY3, M. CHEN1, S. TADURI3,5, S.L. MEYERS6, M.W. SHANKLE6
1 USDA UV-B Monitoring and Research Program, Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523, USA
2 Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins, CO 80523, USA
3 Department of Plant and Soil Sciences, Box 9555, Mississippi State University, MS 39762, USA
5 Department of Biotechnology, Kakatiya University, 506001 Warangal, Telangana State, India
6 Pontotoc Ridge-Flatwoods Branch Experiment Station, Mississippi State University, Pontotoc, MS 38863, USA

Ground-level UV-B will stay at a high level in the next several decades and influence sweet potato growth and yield because of the remaining chlorofluorocarbons in the atmosphere. The study explored three UV-B (none, ambient, and elevated/projected) levels on three contrasting sweet potato cultivars (Beauregard, Hatteras, and Louisiana 1188) using sunlit plant growth chambers at Mississippi State University. The results showed that UV-B influenced three cultivars differently. Growth, photosynthetic rate, epidermal and leaf structure of Beauregard were negatively influenced under ambient and elevated UV-B. On the contrary, Hatteras was positively influenced, and Louisiana 1188 was influenced by elevated UV-B positively on leaf thickness and waxes content, but negatively on the vine length, dry mass, and leaf area. In summary, Beauregard, Louisiana 1188, and Hatteras were UV-B sensitive, moderately sensitive, and tolerant, respectively. Developing UV-B tolerant cultivars will benefit under both current and projected UV-B exposures.

Keywords: combined response index; cultivar differences; gas exchange; Ipomoea batatas; leaf anatomy; water-use efficiency.

Received: July 27, 2018; Accepted: October 9, 2019; Prepublished online: November 21, 2019; Published: March 10, 2020Show citation

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CHEN, Z., GAO, W., REDDY, K.R., CHEN, M., TADURI, S., MEYERS, S.L., & SHANKLE, M.W. (2020). Ultraviolet (UV) B effects on growth and yield of three contrasting sweet potato cultivars. Photosynthetica, 58(1), 37-44. doi: 10.32615/ps.2019.137.
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