Photosynthetic Responses to Salt Stress in Two Rice (Oryza sativa L.) Varieties

被引:2
|
作者
Zuo, Guanqiang [1 ,2 ]
Zhang, Rui [1 ]
Feng, Naijie [1 ,3 ,4 ]
Zheng, Dianfeng [1 ,3 ,4 ]
机构
[1] Guangdong Ocean Univ, Coll Coastal Agr Sci, Zhanjiang 524008, Peoples R China
[2] Northwest A&F Univ, Coll Nat Resources & Environm, Xianyang 712100, Peoples R China
[3] Natl Saline Tolerant Rice Technol Innovat Ctr, Zhanjiang 524008, Peoples R China
[4] Guangdong Ocean Univ, Shenzhen Inst, Shenzhen 518108, Peoples R China
来源
AGRONOMY-BASEL | 2024年 / 14卷 / 09期
关键词
chlorophyll content; leaf disc; linear electron flow; rice; CHLOROPHYLL FLUORESCENCE; PROLINE ACCUMULATION; GAS-EXCHANGE; LEAF; TOLERANCE; PLANTS; YIELD; OVEREXPRESSION; ADJUSTMENT; DROUGHT;
D O I
10.3390/agronomy14092134
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Assessing salt tolerance in plants under field conditions is a challenging task. The objective of this research was to assess the effectiveness of different methods (leaf disc assay and pot experiment) for evaluating salt tolerance in rice. Using two varieties with different salt tolerance, Changmaogu (CM) and 9311, under three NaCl levels (0, 0.3%, and 1.0%), we evaluated the photosynthetic performance in terms of chlorophyll content in leaf disc assays, as well as the photosynthetic rate (Pn), chlorophyll content, linear electron flow (LEF), and non-photochemical quenching (NPQ), in a semi-controlled pot experiment. In the leaf disc assay, CM showed a smaller decrease in chlorophyll content compared to 9311, especially under 1.0% salinity. Simultaneously, in the pot experiment, the CM variety employed flexible photosynthetic strategies, actively decreasing LEF and Pn after 5 days of salt stress (day 5) and then increasing photosynthetic capacity (chlorophyll content, LEF, and Pn) on day 10. Notably, the total chlorophyll content for the CM variety under 1.0% salinity was significantly higher than in the control, showing a 25.0% increase. Additionally, CM demonstrated NPQt sensitivity under 0.3% salinity, requiring an LEF of 150 to achieve an NPQt value of 3.0, compared to an LEF of 180 in the control. These results suggest that a simple leaf disc assay may not fully capture the adaptive mechanisms of rice plants under salinity stress. Therefore, we advocate for the use of more comprehensive methods, such as outdoor pot or field experiments, to gain a deeper understanding and more accurate evaluation of salt tolerance in rice.
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页数:12
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