Effects of Dissolved Oxygen Concentration on Root Growth at Tillering Stage and Nitrogen Utilization Characteristics of Rice
HU JiJie1,2, ZHONG Chu3, HU ZhiHua4, ZHANG JunHua1, CAO XiaoChuang1, LIU ShouKan2, JIN QianYu1, ZHU LianFeng,11China National Rice Research Institute/State Key Laboratory of Rice Biology, Hangzhou 310006 2Taizhou Academy of Agricultural Sciences, Taizhou 317000, Zhejiang 3Guangxi Botanical Garden of Medicinal Plants/Guangxi Key Laboratory of Medicinal Resource Conservation and Genetic Improvement, Nanning 530023 4Jiangxi Institute of Red Soil/National Engineering and Technology Research Center for Red Soil Improvement, Nanchang 331717
Abstract 【Objective】A formal experiment was conducted to reveal the effects of dissolved oxygen (DO) concentration on root growth at the tillering stage and nitrogen utilization of rice, so as to provide a theoretical basis to the rice oxygen nutrition and high-yield cultivation.【Method】The formal experiment was conducted at China National Rice Research Institute in 2016. Three rice varieties, including ZZY 1(lowland rice), IR45765-3B (deep-water rice) and ZH 221 (upland rice), were grown in hydroponic condition with different DO concentration (T1-1 mg·L -1, T2-3 mg·L -1, T3-5.5 mg·L -1, T4-7.5 mg·L -1 and CK-natural growth) controlled by on-line test control system (KUNTENG Q45D, America). The portable dissolved oxygen meters (YSI 550A, America) was used to examine the oxygen concentration in the nutrient solution.【Result】(1) The results showed that the decrease rate of total nitrogen content in whole concentration nutrient solution decreased with the increasing of DO concentration, while the change of ammonium salt content showed the opposite tendency under different DO concentrations. At the same determination time, the nitrate content increased with the increasing of DO concentration. Nitrite content was extremely low and was unstable in whole concentration nutrient solution. (2) Compared with CK, the root activity of three rice cultivars increased in T2, while the root vigor decreased under T1 and T4. The longest root length of three rice cultivars was elongated with increasing of DO concentration, while the total length, total surface area, volume and dry matter were reduced under T1 and T4. The root morphological indexes and dry matter accumulation of ZZY 1 and IR45765-3B under T2 were higher than that of CK. (3) The nitrogen content of three rice cultivars decreased gradually with the increasing of DO concentration at jointing stage, which showed an opposite tendency at full heading stage and full ripe stage. Compared with CK, the nitrogen accumulation of three varieties increased under T2 during the whole growth period. The nitrogen uptake of rice decreased under T3 and T4, while the proportion of nitrogen accumulation from full heading stage to full maturity stage of rice increased significantly. At full ripe stage, nitrogen accumulation of three rice varieties increased 2.3%-7.3% under T2 compared with CK, and decreased 0.7%-3.6%, 3.6%-8.5% and 15.0%-27.1%, respectively, in T1, T3 and T4. (4) The dry matter accumulation and yield of three rice varieties were T2>CK>T1>T3>T4 under different DO concentrations at full ripe stage. In all treatments, the nitrogen dry matter production efficiency was the highest under T1. Compared with CK, T2 improved the harvest index and nitrogen harvest index of three rice varieties, which were declined under other DO concentrations. The nitrogen grain production efficiency of ZZY 1 and IR45765-3B under T1 were significantly lower than that of CK, and there was no significant difference in ZH 221.【Conclusion】A moderate increase of DO concentration could improve the formation of rice root system under the condition of water cultivation, increase the dry matter and nitrogen accumulation, and improve the nitrogen utilization efficiency and yield of rice. Both hypoxia and hyperoxia stress could inhibit the root activity of different ecotypes of rice, and reduce the nitrogen uptake. Besides, the tolerance on the oxygen stress of upland rice was stronger than that of lowland rice and deep-water rice. Keywords:rice;dissolved oxygen;root morphology;nitrogen utilization;hydroponics
PDF (1079KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 胡继杰, 钟楚, 胡志华, 张均华, 曹小闯, 刘守坎, 金千瑜, 朱练峰. 溶解氧浓度对水稻分蘖期根系生长及氮素利用特性的影响[J]. 中国农业科学, 2021, 54(7): 1525-1536 doi:10.3864/j.issn.0578-1752.2021.07.016 HU JiJie, ZHONG Chu, HU ZhiHua, ZHANG JunHua, CAO XiaoChuang, LIU ShouKan, JIN QianYu, ZHU LianFeng. Effects of Dissolved Oxygen Concentration on Root Growth at Tillering Stage and Nitrogen Utilization Characteristics of Rice[J]. Scientia Agricultura Sinica, 2021, 54(7): 1525-1536 doi:10.3864/j.issn.0578-1752.2021.07.016
Fig. 3Dynamics of ammonium, nitrate, nitrite and total nitrogen content in whole concentration nutrient solution at different dissolved oxygen concentrations
Table 2 表2 表2不同溶解氧浓度水稻植株氮素积累量的差异 Table 2Difference in N accumulation of rice under different dissolved oxygen concentrations
品种 Variety
处理 Treatment
氮积累量 N accumulation (mg/plant)
阶段氮积累量 Periodic N accumulation (mg/plant)
阶段氮积累量/总氮积累量 Ratio of periodic N accumulation to total (%)
J
FH
FR
S-J
J-FH
FH-FR
S-J
J-FH
FH-FR
中浙优1号 ZZY 1
CK
398.8a
680.1b
840.8b
398.8a
281.3b
160.6a
47.4
33.5
19.1
T1
379.7a
657.9bc
819.3b
379.7a
278.2b
161.4a
46.3
34.0
19.7
T2
434.6a
734.1a
901.8a
434.6a
299.4ab
167.7a
48.2
33.2
18.6
T3
317.7b
639.6c
810.2b
317.7b
321.9a
170.6a
39.2
39.7
21.1
T4
230.4c
525.6d
665.9c
230.4c
295.2ab
140.3b
34.6
44.3
21.1
IR45765-3B
CK
312.6a
580.3ab
761.4a
312.6a
267.7ab
181.1a
41.1
35.2
23.8
T1
338.2a
558.9b
733.7ab
338.2a
220.7b
174.8a
46.1
30.1
23.8
T2
318.6a
597.5a
779.1a
318.6a
278.9a
181.7a
40.9
35.8
23.3
T3
246.8b
517.7c
696.7b
246.8b
270.9ab
179.1a
35.4
38.9
25.7
T4
201.0c
427.2d
554.9c
201.0c
226.2ab
127.7a
36.2
40.8
23.0
中旱221 ZH 221
CK
243.8a
405.6b
553.9ab
243.8a
161.8b
148.3a
44.0
29.2
26.8
T1
254.5a
407.0b
550.3ab
254.5a
152.5b
143.3a
46.3
27.7
26.0
T2
249.2a
428.8a
579.1a
249.2a
179.6a
150.4a
43.0
31.0
26.0
T3
240.0a
403.5b
531.7b
240.0a
163.5b
138.8a
45.1
30.8
26.1
T4
185.1b
347.8c
471.4c
185.1b
162.6b
133.0a
39.3
34.5
28.2
S-播种期;J-拔节期;FH-齐穗期;FR-完熟期。不同字母表示同一品种不同处理差异显著。下同 S-sowing date; J-jointing stage; FH-full heading stage; FR-full ripe stage. Different letters indicate significant difference among different treatments in the same variety. The same as below
Table 3 表3 表3不同溶解氧浓度水稻氮素利用效率和干物质生产的差异 Table 3Difference in N use efficiency and dry matter accumulation of rice under different dissolved oxygen concentrations
品种 Variety
处理 Treatment
干物质量 Dry matter (g/plant)
产量 Yield (g/plant)
氮收获指数 N harvest index
收获指数 Harvest index
氮素干物质生产效率 N use efficiency for biomass production (kg·kg-1)
氮素籽粒生产效率 N use efficiency for grain production (kg·kg-1)
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