Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12870-022-03766-8/MediaObjects/12870_2022_3766_Fig4_HTML.png)
Content of chlorophyll a (a), chlorophyll b (b), carotenoids (c) and, quantum efficiency of photosystem II (d) of type II energy cane plants (Saccharum spontaneum L.), cultivated in Mn-sufficient and Mn-deficient nutrient solution in the absence (-Si) and in the presence (+ Si) of Si. **Significant at 1% probability; *significant at 5% probability, and ns non-significant by the F-test. Different lowercase letters compare Si conditions under the same Mn condition, while different uppercase letters compare Mn conditions under the same Si condition (p < 0.05 by Tukey’s test). Bars represent the standard error of the mean, n = 5