Effects of lanthanum and silicon stress on bio-sequestration of lanthanum in phytoliths in rice seedlings
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Plant phytoliths are important for silicon (Si) cycling in natural ecosystems; however, their role in lanthanum (La) sequestration in plants is still unclear. In the present study, we elucidated the mechanism of La-induced damage to the growth of rice (Oryza sativa L.) seedling from the viewpoint of the La sequestration by phytoliths (PhytLa). The phytoliths were extracted by using the microwave digestion method. La concentrations within the plants and phytoliths were determined by a modified lithium metaborate fusion method. Analysis showed that pretreatment with low La concentration not only promoted photosynthesis and transpiration in rice but also enhanced the sequestration ability of phytoliths on La. Conversely, high La concentration inhibited photosynthesis and transpiration in rice and the ability of phytoliths to sequester La. Moreover, high Si concentrations promoted the sequestration ability of phytoliths during these processes. Promotion of combined stress of La and Si on the ability of rice seedling was stronger than that of the single La stress. The sequestration ability of phytoliths in different parts of rice varied significantly, following the order: stem > leaf > root. This pattern could be attributed to factors such as the production of various phytolith morphotypes (such as tubes) and PhytLa, PhytLa efficiency, La accumulation, and the rate of photosynthesis and transpiration in different parts of rice seedlings. This study demonstrated that La uptake in rice seedlings was affected by the presence of Si in the medium, and phytolith played a crucial role in the bio-sequestration of La and assuaged the damage caused by La in rice seedlings.
KeywordsLanthanum Phytolith Rice Silicon Photosynthesis Transpiration
La sequestrated by phytoliths
Rare earth element
- Ca + b/Ca/b
Chlorophyll a + b/chlorophyll a/b
Inductively coupled plasma-atomic emission spectroscopy
PhytLa content of organs
Sequestration ability of phytoliths on La
Net photosynthetic rate
This research was supported by a Research and Innovation Project for Postgraduates of Higher Education Institutions of Jiangsu Province (KYLX15_1164) and a grant of the National Natural Science Foundation of China (Grant No. 31170477, 21371100, 21501068).
Y.S. performed the experiment and wrote the paper. Y.S. and L.H.W. analyzed the data. Q.Z., X.H.H. and Y.S. designed the study. All authors discussed the results and commented on the manuscript.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no competing interests.
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