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| DOI：10.13522/j.cnki.ggps.2020041 |
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| The Influence of Anti-drought Chemical Agents on Growth and Quality of Shallow - Root Tomato |
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YUE Huanfang, WANG Kewu*, AN Shunwei, HU Xiaoyi, MENG Fanyu, WANG Zhiping
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Beijing Agricultural Technology Extension Station, Beijing 100029, China
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| Abstract: |
| 【Background】 With living standard improving, the demand for high-quality vegetables has been increasing. Deficit irrigation by deliberately thirsting the roots for a limited period has proven effective to improve fruit quality of tomato by increasing the content of soluble substances and fruit taste. In the meantime, it has been found that spraying anti-drought chemical agents on the leaves was effective to slow down leaf wilting and to ameliorate the yield reduction caused by water stress in the deficit irrigation. While different anti-drought chemical agents are available, there is a lack of consensus on their efficacy on different crops.【Objective】The aim of this paper is to fill this knowledge gap by comparative experiments.【Method】 The experiment was carried out in a tomato field at Miyun, Beijing. The deficit irrigation was introduced at the fruiting stage and we compared three types of anti-transpiration agents by spraying them three times over the leaves during the fruiting stage: film-forming anti-transpiration agent, metabolic anti-transpiration agent, and 24-epbrassinolide agent. The control was to spray the leaves simultaneously with water. In each experiment, we measured the growth indexes, yield and fruit quality of the tomato. The effects of the anti-drought agents on substances like SOD, MDA and Pro were also measured.【Result】All three anti-drought agents improved wilting and promoted tomato growth under water stress, increasing the average stem diameter by 9.17%~22.09%, compared to the CK. Compared with other treatments, both 24-epbrassinolide and metabolic agents increased SPAD content, with the 24-epbrassinolide agent increasing the average SPAD by 4.7% and reducing the wilting index in the later growth stage by 9% compared to the CK. The SOD content under 24-epibrassinolide treatment was 4.59 U/g, higher than that in other treatments. The three treatments increased the contents of the sixteen amino acids by 60.7%, 58.9% and 58.9% respectively, and the content of Pro by 133.3%, 133.3% and 130% respectively, compared the CK. The metabolic anti-transpiration agent and the 24-epibrassinolide agent increased the total soluble sugar content by 0.66% and 0.92% respectively compared to the CK.【Conclusion】The 24-epbrassinolide and metabolic anti-transpiration agents can both improve the resistance of the tomato against the water stress. |
| Key words: film-forming anti-transpiration; metabolic anti-transpiration; 24-epbrassinolide; shallow-root cultivation; tomato |
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