The Comprehensive Regulation of Light Intensity and Photoperiod on Growth and Yield of Virus-Free Potato Under the Same Daily Light Integral
The effects of the combination of the light intensity and photoperiod on the yield of virus-free potato and resource utilization are still poorly understood, especially under the same daily light integral. Here, we tested the responses of virus-free potato in terms of plant growth, photosynthesis, a...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-04-01
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| Series: | Agronomy |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4395/15/4/898 |
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| Summary: | The effects of the combination of the light intensity and photoperiod on the yield of virus-free potato and resource utilization are still poorly understood, especially under the same daily light integral. Here, we tested the responses of virus-free potato in terms of plant growth, photosynthesis, and the tuber yield to four light intensity and photoperiod combinations (T1, 200 μmol m<sup>−2</sup> s<sup>−1</sup> and 16.5 h; T2, 300 μmol m<sup>−2</sup> s<sup>−1</sup> and 11 h; T3, 400 μmol m<sup>−2</sup> s<sup>−1</sup> and 8.25 h; T4, 500 μmol m<sup>−2</sup> s<sup>−1</sup> and 6.6 h) under the same daily light integral. The tuber number and dry weight increased with the shortening of the photoperiod. The smaller number of tubers under the T1 treatment was due to the poor transport of photosynthates in the leaves and the uneven distribution of photosynthates in the tubers during the tuber formation stage. Changes in the light intensity and photoperiod combination did not significantly impact the distribution ratio of photosynthates between plants and tubers at the tuber growth stage; they only caused adjustments in the total amount of photosynthates. In addition, the photoinhibition under T1 was caused by the long photoperiod and that under T4 was caused by the high light intensity. However, the higher content of carotene in the T4 treatment alleviated the adverse effects of photoinhibition on the tuber yield. The results showed that the number and growth of tubers were extremely negatively correlated with shoot growth and extremely positively correlated with the accumulation rate of photosynthates in the plant and the tubers per day. In terms of energy consumption and the cost of the light source, we recommend the light intensity and photoperiod combinations of 300 μmol m<sup>−2</sup> s<sup>−1</sup> and 11 h or 400 μmol m<sup>−2</sup> s<sup>−1</sup> and 8.25 h to cultivate virus-free potato in plant factories. |
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| ISSN: | 2073-4395 |