| 战莘晔,吕晓,金丹丹,殷红.UV-B辐射增强对粳稻营养生长时期叶片光合特性的影响[J].农业环境科学学报,2020,39(11):2515-2523. |
| UV-B辐射增强对粳稻营养生长时期叶片光合特性的影响 |
| Effect of UV-B radiation on photosynthetic characteristics of Japonica rice during vegetative growth |
| 投稿时间：2020-04-15 |
| DOI：10.11654/jaes.2020-0420 |
| 中文关键词: UV-B 粳稻 营养生长期 光合电子传递 荧光诱导动力学参数 |
| 英文关键词: UV-B Japonica rice vegetative growth photosynthetic electron transport fluorescence induction kinetic parameters |
| 基金项目:国家重点研发计划项目（2017YFD0300107）；国家自然科学基金项目（31771673） |
|
| 摘要点击次数: 3690 |
| 全文下载次数: 3009 |
| 中文摘要: |
| 为了解紫外（UV-B）辐射增强对营养生长时期粳稻光合特性的影响，研究了粳稻营养生长时期光合电子传递和荧光诱导动力学曲线（OJIP曲线）及其参数的变化特征。试验材料选用‘沈农265’，试验方式为盆栽，设置对照组CK（自然光照射）、处理组T1（自然光基础上增加5% UV-B辐射）和T2（自然光基础上增加10% UV-B辐射）。结果表明：UV-B辐射增强在3个测定时期（移栽后第20、40、60 d）不同程度降低了参与光呼吸的电子流（Jo）和参与碳还原的电子流（Jc），增加10% UV-B辐射对于Jo的抑制作用大于增加5% UV-B辐射，不同程度增加了光呼吸电子流占比；UV-B处理对Rubisco氧化速率（Vo）变化趋势不明显，但都不同程度降低了Rubisco羧化速率（Vc），且Vo/Vc呈上升趋势，与UV-B辐射强度呈正相关。UV-B辐射会降低粳稻OJIP曲线的P相值。3个测定时期的原初光能转换效率（Fv/Fm）、光化猝灭系数（qP）、光合电子传递相对速率（rETR）均减小，只有非光化猝灭系数（NPQ）升高，T2对Fv/Fm、qP、rETR的抑制作用大于T1。在营养生长时期UV-B辐射增强了Jo的比例，降低了Jc的比例，同时也降低了Vc，且随UV-B辐射的增强，改变的比例与速率增大，UV-B辐射最终会影响营养生长时期叶片的相对荧光产量。研究表明，UV-B辐射的增强，抑制了营养生长期叶片的光化猝灭程度，却促进了非光化猝灭速度，同时光电子传递速率也有所降低。 |
| 英文摘要: |
| In order to analyze the effect of enhanced UV-B radiation on the photosynthetic characteristics of Japonica rice during vegetative growth, an experiment was conducted to determine the characteristics of photosynthetic electron transport and fluorescence induction kinetics curves (OJIP)and their parameters. The Japonica variety Shen-nong 265 was used and was exposed to either natural light (CK)or enhanced UV-B radiation. The UV-B radiation was increased by 5% as the T1 treatment, increased by 10% as the T2, respectively. UV-B radiation enhancement reduced photorespiratory electron flow (Jo)and carbon electron flow (Jc)to different degrees; under T2, Jo was inhibited more compared to under T1, while Jo/JF and Jo/Jc were increased to different degrees. UV-B treatment showed insignificant trends regarding Rubisco oxidation rate (Vo); however, Rubisco carboxylation rate (Vc) was reduced significantly. Vo/Vc showed increasing trend, which was positively correlated with UV-B radiation intensity. UV-B radiation reduced the P-phase value of the OJIP curve. The original light energy conversion efficiency (Fv/Fm), smooth quenching coefficient (qP), and relative rate of photosynthetic electron transfer (rETR) decreased during the 20th, 40th and 60th days after transplanting, but the non-photochemical quenching coefficient (NPQ)increased. Fv/Fm, qP, and rETR were inhibited to a greater extent under T2 than under T1. Thus, the enhanced UV-B radiation during the vegetative growth period enhanced the proportion of photorespiratory electron flow, reduced the proportion of carbon reduction electron flow, and also reduced the Rubisco carboxylation rate. Ultimately, it affected the relative fluorescence yield of leaves. The enhanced UV-B radiation suppressed the degree of photochemical quenching of vegetative growth leaves, but promoted the rate of non-photochemical quenching; the photoelectron transfer rate was also reduced. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
