Photosynthetica 2021, 59(4):625-632 | DOI: 10.32615/ps.2021.052

Effects of red to far-red light ratio on growth and photosynthetic characteristics of tomato seedlings under calcium nitrate stress

X.T. ZHOU†, Z.L. LI†, J.J. HE†, X.Y. WANG, Q.L. LIU, J. HUANG, Y.D. XIE, Z.Q. HE
College of Horticulture, Sichuan Agricultural University, 611130 Chengdu, China

Secondary soil salinization causes plant stress, which can be relieved by different ratios of red to far-red light (R:FR). Our study aimed to elucidate the role of low R:FR ratios treatments on photosynthesis and growth of tomato seedlings in salinized soils. Tomato seedlings were treated under three R:FR ratios and calcium nitrate was applied simultaneously. The results showed that the treatments under low R:FR ratios stimulated growth parameters of tomato seedlings under calcium nitrate stress, the best impact being achieved at the R:FR ratio of 0.7 in this experiment. Low R:FR ratios treatments increased proline content as well as PSII maximum efficiency, actual electron transport operating efficiency, and photochemical quenching of tomato seedlings under calcium nitrate stress but decreased the value of nonphotochemical quenching. Moreover, low R:FR ratios treatments promoted net photosynthetic rate and increased the expression of a Rubisco gene. In conclusion, low R:FR ratios treatments could improve the salt resistance of greenhouse tomato plants.

Additional key words: calcium nitrate stress; chlorophyll fluorescence; photosynthesis; red to far-red light ratio; salt stress; tomato.

Received: May 14, 2021; Revised: October 18, 2021; Accepted: November 1, 2021; Prepublished online: November 23, 2021; Published: December 17, 2021  Show citation

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ZHOU, X.T., LI, Z.L., HE, J.J., WANG, X.Y., LIU, Q.L., HUANG, J., XIE, Y.D., & HE, Z.Q. (2021). Effects of red to far-red light ratio on growth and photosynthetic characteristics of tomato seedlings under calcium nitrate stress. Photosynthetica, 59(4), 625-632. doi: 10.32615/ps.2021.052
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