局部恢复供水对苗期玉米生长、根系吸收能力及解剖结构的影响

doi:10.3864/j.issn.0578-1752.2017.16.006

Abstract

Abstract: 【Objective】 Response of crops to partial water resupply has attracted more attention. It is necessary to investigate soil moisture condition previous partial root-zone irrigation when the technology of partial root-zone irrigation is applied. This study was aimed to identify the dynamics of maize growth and water absorption capacity under partial water resupply and the physiological mechanism of compensation effect. 【Method】 With the split-root technology, a hydroponic experiment was conducted to analyze non-stressed and stressed sub-root under partial water resupply, where the water stress was simulated by the osmotic potential of a nutrient solution (PEG-6000). There were three water stress levels, i.e., -0.2 MPa, -0.4 MPa, -0.6 MPa and a control treatment (no PEG). The maize growth, root hydraulic conductance and leaf water potential were measured on the 0, 0.25, 0.5, 1, 3, 5, 7 and 9 day after partial water resupply (DAT). 【Result】 Root growth rate and hydraulic conductance in non-stressed sub-root were higher than that in stressed sub-root under partial water resupply. Compared to control treatment, root dry weight growth rate in non-stressed sub-root was significantly enhanced during 0-5 DAT, 0.25-0.5 DAT and 0.5-1 DAT in -0.2, -0.4 and -0.6 MPa treatments, respectively. Average increase rate of root hydraulic conductance in non-stressed had no significant difference at 5 DAT in -0.2 MPa treatment if compared to control treatment, whereas it was significantly reduced in the whole treatment period in -0.4 and -0.6 MPa treatments, indicating that the threshold of water stress previous partial water resupply for the compensatory effect of water uptake in non-stressed sub-root system was ≥-0.2 MPa. Moreover, root diameter and vessel diameter in non-stressed sub-root was significantly reduced at 5 DAT compared with that of 1 DAT in -0.2 MPa treatment, but it was maintained or higher than the level of control treatment. There was no significant difference in root cortex thickness/diameter ratio in non-stressed sub-root at 5 DAT between -0.2 MPa and control treatments. At 9 DAT, compared to control treatment, root diameter and vessel diameter in non-stressed sub-root was significantly decreased by 19%, but cortex thickness/diameter ratio showed a reverse trend. 【Conclusion】The compensatory effects of root growth and water uptake in non-stressed sub-root under partial water resupply were closely related to water stress severity and water resupply duration, which depended on root anatomical structure in non-stressed sub-root. Thus, the above conclusion provides theoretical support for regulating the interaction between plants and soil environment and making use of the potential plant response to soil water stress.

Key words: maize seedling, water stress severity, partial water resupply, root hydraulic conductance, leaf water status, accumulation and allocation of dry mass, root anatomical structure

NIU XiaoLi, HU TianTian, ZHANG FuCang, DUAN AiWang, LIU ZhanDong, SHEN XiaoJun . Effect of Partial Water Resupply at Seedling Stage on Maize Growth, Water Absorption Capacity and Anatomical Structure[J].Scientia Agricultura Sinica, 2017, 50(16): 3110-3121.

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