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

Zhou, Xiaoting; Li, Z.L.; He, Jiale; Wang, X.Y.; Liu, Q.L.; Huang, Jia; Xie, Yanyang; He, Zhongqun

doi:10.32615/ps.2021.052

Cited by 7 publications

(11 citation statements)

References 40 publications

(37 reference statements)

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“…In this study, low R/FR increased total Rubisco activity and upregulated expression of most key genes (rbcS, Rca, FBPase, SBPase, Rupe and PRK) involved in Calvin cycle. These observations were consistent with the observations in tomato (Zhou et al, 2021) and spinach (Tan et al, 2022). These changes illustrating that low R/FR promoted carbon assimilation under salt stress through upregulating the expression levels and activity of Rubisco and other Calvin cycle enzymes.…”

Section: Low R/fr Accelerated Calvin Cycle In Salt-stressed Cucumber ...supporting

confidence: 91%

“…The previous studies showed that Low R/FR could enhance leaf photosynthesis by promoting carbon assimilation (Tan et al, 2022). Zhou et al (2021) have suggested that low R/FR improved leaf photosynthetic capacity by up-regulating RBCS (encoding for small subunit of Rubisco) gene expression under calcium nitrate stress. In this study, low R/FR increased total Rubisco activity and upregulated expression of most key genes (rbcS, Rca, FBPase, SBPase, Rupe and PRK) involved in Calvin cycle.…”

Section: Low R/fr Accelerated Calvin Cycle In Salt-stressed Cucumber ...mentioning

confidence: 99%

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Low red to far-red light ratio promotes salt tolerance by improving leaf photosynthetic capacity in cucumber

Miao

Gao²,

Li³

et al. 2023

Front. Plant Sci.

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Soil salinity severely inhibits leaf photosynthesis and limits agricultural production. Red to far-red light ratio (R/FR) affects leaf photosynthesis under salt stress, however, its regulation mechanism is still largely unknown. This study investigated the effects of different R/FR on plant growth, gas exchange parameters, photosynthetic electron transport, Calvin cycle and key gene expression under salt stress. Cucumber seedlings were exposed to four treatments including 0 mM NaCl and R/FR=7 (L7, control), 0 mM NaCl and R/FR=0.7 (L0.7), 80 mM NaCl and R/FR=7 (H7) and 80 mM NaCl and R/FR=0.7 (H0.7) for 9 days in an artificial climate chamber. The results showed that compared to L7 treatment, H7 treatment significantly reduced relative growth rate (RGR), CO2 assimilation rate (Pn), maximum photochemical efficiency PSII (Fv/Fm), most JIP-test parameters and total Rubisco activity, indicating that salt stress severely inhibited photosynthetic electron transport from PSII to PSI and blocked Calvin cycle in cucumber leaves. However, these suppressions were effectively alleviated by low R/FR addition (H0.7 treatment). Compared to H7 treatment, H0.7 treatment significantly increased RGR and Pn by 209.09% and 7.59%, respectively, enhanced Fv/Fm, maximum quantum yield for primary photochemistry (φPo), quantum yield for electron transport (φEo) and total Rubisco activity by 192.31%, 17.6%, 36.84% and 37.08%, respectively, and largely up-regulated expressions of most key genes involved in electron transport and Calvin cycle. In conclusion, low R/FR effectively alleviated the negative effects of salt stress on leaf photosynthesis by accelerating photosynthetic electron transport from PSII to PQ pool and promoting Calvin cycle in cucumber plants. It provides a novel environmentally friendly light-quality regulation technology for high efficiency salt-resistant vegetable production.

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Section: Low R/fr Accelerated Calvin Cycle In Salt-stressed Cucumber ...supporting

confidence: 91%

Section: Low R/fr Accelerated Calvin Cycle In Salt-stressed Cucumber ...mentioning

confidence: 99%

Low red to far-red light ratio promotes salt tolerance by improving leaf photosynthetic capacity in cucumber

Miao

Gao²,

Li³

et al. 2023

Front. Plant Sci.

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“…In this study, we found that the growth of pakchoi was inhibited under high nitrogen stress, with a decrease in the fresh weight, leaf width, and leaf length (Table 1). Similar observations were found in tomato seedlings under high nitrogen stress by Zhou et al [28]. However, a higher proportion of far-red light in the environment can significantly improve the accumulation of the fresh weight of pakchoi under high nitrogen concentrations (Table 1).…”

Section: Discussionsupporting

confidence: 86%

“…In addition, the reduction of the R/FR ratio accelerated the photosynthesis capacity in pakchoi under excess nitrate stress [30]. Another study found that a low R/FR ratio promoted the net photosynthetic rate by increasing the expression of a Rubisco gene (RBCS) of tomato seedlings under calcium nitrate stress [28]. Thus, the enhancement of a low R/FR ratio on photosynthesis may provide the plants with the potential for growth under excess nitrate stress.…”

Section: Discussionmentioning

confidence: 98%

Low R/FR Ratio Affects Pakchoi’s Growth and Nitrate Content under Excess Nitrate Stress

et al. 2022

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Nitrate accumulation is one of the main factors of secondary soil salinization in protected horticulture in China. Previous studies have shown that a low red(R)/far-red (FR) ratio can improve the salt tolerance of plants under NaCl stress. However, the effect of a low R/FR ratio on plant growth under nitrate stress is not clear. In order to explore the effect of a low R/FR ratio on the adaptability of pakchoi under high nitrogen stress, the growth index, soluble protein content, soluble sugar content, nitrate content, nitrate reductase activity and Nia2 gene expression of pakchoi’s leaves were measured. The results showed that a high level of nitrogen (the addition of 80 mmol · L−1 NO3− (N80) and 160 mmol · L−1 NO3− (N160)) inhibited the growth of pakchoi and promoted the accumulation of osmoregulation substances and nitrate content, respectively. The reduction of the R/FR ratio under high nitrogen stress (L80) increased the fresh weight of the plants under it by 19.0%, reduced the nitrate content in the leaves by 22.7%, increased the NR activity by 29.9%, and made the Nia2 gene expression more significant, compared with N80. There was a similar mitigation effect of a low R/FR ratio under 160 mmol · L−1 excessive NO3− stress. Therefore, the reduction of the R/FR ratio can effectively control the nitrate content and improve the adaptability of pakchoi under high nitrogen stress. Thus, there is a practical application prospect for a low R/FR ratio for the production of pakchoi under a high level of nitrogen.

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“…The secondary salinization of soil has become the main limiting factor of the sustainable development of agricultural production [ 1 ]. However, in contrast to open-field cultivation, the excessive accumulation of Ca(NO 3 ) 2 in secondary saline soil is more prevalent compared to that of NaCl, due to excessive fertilization and intensive farming in greenhouses [ 2 , 3 ]. This excess Ca(NO 3 ) 2 inhibits plant growth and causes ion imbalances, resulting in oxidative stress and reduced water availability [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Transcriptome Mechanisms of Tomato Seedlings Induced by Low-Red to Far-Red Light Ratio under Calcium Nitrate Stress

Zhou

Huang

You-min

et al. 2023

IJMS

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In recent times, the excessive accumulation of nitrate has been one of the main reasons for the secondary salinization of greenhouse soils. Light plays a key role in a plant’s growth, development, and response to stress. A low-red to far-red (R:FR) light ratio could enhance plant salinity tolerance, but the mechanism at a molecular level is unclear. Thus, we analyzed the transcriptome responses of tomato seedlings to calcium nitrate stress under either a low R:FR ratio (0.7) or normal light conditions. Under calcium nitrate stress, a low R:FR ratio enhanced both the antioxidant defense system and the rapid physiological accumulation of proline in tomato leaves, which promoted plant adaptability. Using weighted gene co-expression network analysis (WGCNA), three modules including 368 differentially expressed genes (DEGs) were determined to be significantly associated with these plant traits. Functional annotations showed that the responses of these DEGs to a low R:FR ratio under excessive nitrate stress were enriched in the areas of hormone signal transduction, amino acid biosynthesis, sulfide metabolism, and oxidoreductase activity. Furthermore, we identified important novel hub genes encoding certain proteins, including FBNs, SULTRs, and GATA-like transcription factor, which may play a vital role in low R:FR light-induced salt responses. These findings offer a new perspective on the mechanisms and environmental implications behind low R:FR ratio light-modulated tomato saline tolerance.

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

Cited by 7 publications

References 40 publications

Low red to far-red light ratio promotes salt tolerance by improving leaf photosynthetic capacity in cucumber

Low red to far-red light ratio promotes salt tolerance by improving leaf photosynthetic capacity in cucumber

Low R/FR Ratio Affects Pakchoi’s Growth and Nitrate Content under Excess Nitrate Stress

Transcriptome Mechanisms of Tomato Seedlings Induced by Low-Red to Far-Red Light Ratio under Calcium Nitrate Stress

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