Abstract
The relationship between the severity of natural freezing and frost damage (FFD) and the observed growth recovery and field production of Superior potatoes (Solanum tuberosum L.) was investigated under screen house conditions. Potato plants were damaged by accidental freezing and frost during the early phase of shoot growth, 40 days after planting in highland summer crop areas in Korea. The observations of FFD were classified visually into “severe” (>75%), “moderate” (50%), “mild” (<25%), and “no FFD”, based on the percentage of the area of the shoots which was damaged. The early vegetative growth recovery, in terms of groundcover, was reduced as the level of FFD increased. At 28 days after a freezing and frost damage (DAFF), the potato plants with mild or no symptoms had produced more groundcover than the plants with moderate or severe symptoms. At 35 DAFF, groundcover was the same across all levels of severity, at nearly 100%. Despite the slower canopy development, plants with FFD achieved a higher fresh shoot weight and total chlorophyll content, whereas physiological growth indices such as photosynthetic rate and stomatal conductance of leaves were not different among levels of FFD at 60 DAFF. The number of lateral stems and days to tuberization increased significantly as the level of FFD increased; however, the harvest index, the number of tubers per plant, and seed tuber production were all reduced in plants with severe FFD. In addition, the tubers from plants with severe FFD had an increased ratio of length to width and 40% more tuber eyes than tubers from undamaged plants. The elongated tubers also showed an increase in cell division, demonstrated by higher numbers of cells in the cortical zones. The aforementioned measurements were obtained from natural event and led to a deduction that Superior has a capacity to recover from FFD, unless the plants were severely damaged (>75%) early in the season.
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Acknowledgments
The authors of this study would like to thank the Gangwon Potato Seed Distribution Center for making available the potato fields with damage from freezing and frost. A grateful acknowledgement should also be given to Deok Hyun Cho and Hyun Jin Kim for their data collection. Financial support for this study was provided by the RDA-HARC potato research program (project no. PJ006364201010).
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Chang, D.C., Sohn, H.B., Cho, J.H. et al. Freezing and Frost Damage of Potato Plants: a Case Study on Growth Recovery, Yield Response, and Quality Changes. Potato Res. 57, 99–110 (2014). https://doi.org/10.1007/s11540-014-9253-5
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DOI: https://doi.org/10.1007/s11540-014-9253-5