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Application of Xerophytophysiology and Signal Transduction in Plant Production: Partial Root-Zone Drying in Potato Crops

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Abstract

The irrigation method of partial root-zone drying (PRD) is based on drought stimulation without real water stress in order to induce xerophytophysiological signalling and regulations. In the present study, a series of measurements with potato (Solanum tuberosum L.) crops were conducted to understand the mechanisms underlying PRD. The results showed that PRD-induced osmotic adjustment shown by lower osmotic potential and higher turgor potential in fully turgid leaves and higher symplastic water fraction in cells. The PRD-induced osmotic adjustment was also confirmed by the active accumulation of osmolytes such as free proline, soluble sugars and soluble proteins. In PRD-treated potato plants, turgor maintenance by osmotic adjustment ensured improvements in photosynthetic activities, plant growth and final tuber yield. One of the signal substances, superoxide (O2), was increased by PRD but soon eliminated by superoxide dismutase (SOD), which was activated by PRD along with catalase (CAT) and peroxidase (POD). As one of the stress-responsive genes, the aquaporin gene RD28 was upregulated by PRD and might explain the improved physiological activities associated with the abovementioned xerophytophysiological regulations.

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Funding

This research was partially supported by the Central Public-Interest Scientific Institution Basal Research Fund (Farmland Irrigation Research institute, CAAS FIRI2016-02); the National Natural Science Foundation of China (No. 31501358: Potato xerophytic physiological mechanism and functional analysis of key genes induced by partial root-zone drying) Key Laboratory of Crop Water Use and Regulation, China Ministry of Agriculture (CWRR201403); the Postdoctoral Scientific Research Foundation Programs of Heilongjiang provincial government (LRB10-624); and the National Key Research and Development Programs (2018YFD020080301).

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Correspondence to Dianqiu Lyu or Hui-lian Xu.

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Su, F., Li, Y., Liu, S. et al. Application of Xerophytophysiology and Signal Transduction in Plant Production: Partial Root-Zone Drying in Potato Crops. Potato Res. 63, 41–56 (2020). https://doi.org/10.1007/s11540-019-09427-y

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