14-羟芸·噻苯隆对盐胁迫下水稻光合特性、抗氧化系统及产量的影响

doi:10.13292/j.1000-4890.202303.029

生态学杂志 ›› 2023, Vol. 42 ›› Issue (3): 668-676.doi: 10.13292/j.1000-4890.202303.029

14-羟芸·噻苯隆对盐胁迫下水稻光合特性、抗氧化系统及产量的影响

黄露¹,余明龙^1,3,冯乃杰^1,2*,郑殿峰^1,2,马国辉^1,4*

（¹广东海洋大学滨海农业学院，广东湛江 524088； ²广东海洋大学深圳研究院，广东深圳 518108；³黑龙江八一农垦农学院，黑龙江大庆 163319； ⁴湖南杂交水稻研究中心杂交水稻国家重点实验室，长沙 410125）

出版日期:2023-03-10 发布日期:2023-03-09

Effects of 14-hydroxylated brassinosteroid·thidiazuron on photosynthetic characteristics, antioxidant system, and yield of rice under salt stress.

HUANG Lu¹, YU Minglong^1,3, FENG Naijie^1,2*, ZHENG Dianfeng^1,2, MA Guohui^1,4*

(¹College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang 524088, Guangdong, China; ²Shenzhen Research Institute of Guangdong Ocean University, Shenzhen 518108, Guangdong, China; ³College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, Heilongjiang, China; ⁴State Key Laboratory of Hybrid Rice, Hunan Hybrid Rice Research Center, Changsha 410125, China).

Online:2023-03-10 Published:2023-03-09

摘要/Abstract

摘要： 为探讨不同生育时期喷施能百旺2.0（0.16% 14-羟芸·噻苯隆+聚谷氨酸）对盐胁迫下水稻生长及产量的缓解效应，以杂交稻湘两优900和常规稻黄华占为试材，研究连续喷施2次（分蘖期和抽穗期）或3次（分蘖期、抽穗期和灌浆期）能百旺对0.3%盐胁迫下水稻光合特性、抗氧化代谢、渗透调节和产量的影响。结果表明：盐胁迫抑制两品种水稻生长，显著降低净光合速率（P_n），使湘两优900和黄华占的产量分别降低33.7%和43.2%。叶面喷施能百旺可缓解盐胁迫对水稻生长的抑制，喷施2次显著增加湘两优900和黄华占的有效分蘖，喷施3次显著增加黄华占的株高、茎粗、总叶片数、剑叶长和倒二叶长；喷施2或3次能百旺均能显著提高两品种水稻叶片的P_n、气孔导度（G_s）和叶绿素含量，增强抗氧化酶（SOD、CAT、POD和APX）活性，上调非抗氧化剂（AsA和GSH）水平，促进脯氨酸积累，降低过氧化氢（H₂O₂）和丙二醛（MDA）含量，湘两优900和黄华占的产量在喷施2次能百旺后分别止损20.0%和14.3%，在喷施3次能百旺后分别止损14.5%和28.6%。综上所述，叶面喷施能百旺通过增强光合活性、抗氧化系统和渗透调节潜力，减轻了盐胁迫对水稻的伤害，从而在一定程度上缓解了盐胁迫下的产量损失。

关键词: 水稻, 能百旺, 盐胁迫, 抗氧化代谢, 产量

Abstract: To investigate the alleviating effects of spraying Nengbaiwang 2.0 (0.16% 14-hydroxylated brassinosteroid·thidiazuron+polyglutamic acid) at different stages on rice growth and yield under salt stress, hybrid rice ‘Xiangliangyou 900’ and commonly cultivated rice ‘Huanghuazhan’ were used as the experimental materials to examine the effects of continuous spraying Nengbaiwang for 2 (sprayed once at tillering stage and heading stage) or 3 (sprayed once at tillering stage, heading stage, and grain filling stage) times on photosynthetic characteristics, antioxidant metabolism, osmotic regulation, and yield of rice under 0.3% salt stress. The results showed that salt stress inhibited the growth of both rice varieties, significantly decreased net photosynthetic rate (Pn), and reduced yield by 33.7% and 43.2% in Xiangliangyou 900 and Huanghuazhan, respectively. Foliar spraying Nengbaiwang could alleviate the negative effects of salt stress on rice growth. Spraying Nengbaiwang twice significantly increased the effective tillers of Xiangliangyou 900 and Huanghuazhan, and spraying three times significantly increased plant height, stem diameter, total leaf number, flag leaf length, and inverted second leaf length of Huanghuazhan under salt stress compared with the single salt treatment. Foliar spraying Nengbaiwang for two or three times significantly increased the P_n, stomatal conductance (G_s), chlorophyll content, the activities of antioxidant enzymes (SOD, CAT, POD, and APX), the levels of non-antioxidants (AsA and GSH), and proline accumulation. However, it decreased the contents of hydrogen peroxide (H₂O₂) and malondialdehyde (MDA) under salt stress compared to the single salt treatment. The yield loss of Xiangliangyou 900 and Huanghuazhan was alleviated by 20.0% and 14.3%, respectively, after spraying twice Nengbaiwang, and 14.5% and 28.6%, respectively, after spraying three times Nengbaiwang. In conclusion, foliar spraying Nengbaiwang could reduce the damage caused by salt stress on rice by enhancing photosynthetic activity, antioxidant system, and osmotic regulation potential, thus alleviating yield loss under salt stress.

Key words: rice, Nengbaiwang, salt stress, antioxidant metabolism, yield.

黄露, 余明龙, 冯乃杰, 郑殿峰, 马国辉. 14-羟芸·噻苯隆对盐胁迫下水稻光合特性、抗氧化系统及产量的影响[J]. 生态学杂志, 2023, 42(3): 668-676.

HUANG Lu, YU Minglong, FENG Naijie, ZHENG Dianfeng, MA Guohui. Effects of 14-hydroxylated brassinosteroid·thidiazuron on photosynthetic characteristics, antioxidant system, and yield of rice under salt stress.[J]. Chinese Journal of Ecology, 2023, 42(3): 668-676.

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14-羟芸·噻苯隆对盐胁迫下水稻光合特性、抗氧化系统及产量的影响

Effects of 14-hydroxylated brassinosteroid·thidiazuron on photosynthetic characteristics, antioxidant system, and yield of rice under salt stress.

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