Root pressure of hydroponic Dracaena sanderiana and its determinants

doi:10.17521/cjpe.2022.0113

Abstract

Abstract:

Aims Xylem positive pressure (root pressure) has gained new interests after a long period of underestimation, because it is important to restore tissue moisture, maintain function and interconnection of plant hydraulic system, and it contributes to cell and tissue growth.

Methods In this study, hydroponic Dracaena sanderiana of 60-80 cm in height were used to study the circadian variation of root pressure and its determinants, in order to reveal the role that root pressure plays in the upward transport of water across xylem.

Important findings (1) Positive root pressure of D. sanderiana existed throughout the day, and the maximum value obtained was 103 kPa, with a rhythm of high root pressure at daytime and low at night. (2) Root pressure decreased as water temperature declined, and at 0 °C, root pressure reduced to nearly zero and the circadian rhythm was altered too. (3) Different concentrations of nitrate (KNO₃) addition all increased root pressure, but the circadian rhythm was not altered. (4) Root pressure of stems with tillers was smaller (but still positive) than that of stems without tillers. (5) After completely cutting off the fibrous roots, root pressure quickly decreased to negative. In summary, the positive root pressure of most of the hydroponic D. sanderiana can fully provide the force needed to transport the water upwards to leaves throughout the day, and the force of transpirational pull is not needed. At the same time, the root pressure showed a relatively stable rhythm, that is, high at the day and low at night. Temperature, nitrogen content, tillers and root removing all had significant effects on root pressure.

Key words: hydroponic Dracaena sanderiana, root pressure, xylem long-distance water transport, temperature, nitrate, transpirational pull

ZHANG Min, SANG Ying, SONG Jin-Feng. Root pressure of hydroponic Dracaena sanderiana and its determinants[J]. Chin J Plant Ecol, 2023, 47(7): 1010-1019.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2022.0113

https://www.plant-ecology.com/EN/Y2023/V47/I7/1010

Figures/Tables 7

Fig. 1 Root pressure of Dracaena sanderiana in different months.

Fig. 2 Root pressure of Dracaena sanderiana with stem immersing in water. , all immersed in water.

Fig. 3 Root pressure of Dracaena sanderiana after stem moisturizing.

Fig. 4 Root pressure of Dracaena sanderiana treated at different temperatures.

Fig. 5 Root pressure of Dracaena sanderiana treated with different concentrations of nitrate.

Fig. 6 Root pressure of Dracaena sanderiana with and without tillers.

Fig. 7 Root pressure of Dracaena sanderiana after cutting off the fibrous roots.

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