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. 2023 Apr 7;8(15):13971-13981.
doi: 10.1021/acsomega.3c00376. eCollection 2023 Apr 18.

Silicic and Ascorbic Acid Induced Modulations in Photosynthetic, Mineral Uptake, and Yield Attributes of Mung Bean (Vigna radiata L. Wilczek) under Ozone Stress

Eram Shahzadi  1 , Muhammad Nawaz  1 , Naeem Iqbal  1 , Baber Ali  2 , Muhammad Adnan  3 , Muhammad Hamzah Saleem  4 , Mohammad K Okla  5 , Zahid Khorshid Abbas  6 , Salem Mesfir Al-Qahtani  7 , Nadi Awad Al-Harbi  7 , Romina Alina Marc  8
Affiliations

Silicic and Ascorbic Acid Induced Modulations in Photosynthetic, Mineral Uptake, and Yield Attributes of Mung Bean (Vigna radiata L. Wilczek) under Ozone Stress

Eram Shahzadi et al. ACS Omega. .

Abstract

Most of the world's crop production and plant growth are anticipated to be seriously threatened by the increasing tropospheric ozone (O3) levels. The current study demonstrates how different mung bean genotypes reacted to the elevated level of O3 in the presence of exogenous ascorbic and silicic acid treatments. It is the first report to outline the potential protective effects of ascorbic and silicic acid applications against O3 toxicity in 12 mung bean {Vigna radiata (L.) Wilken} varieties. Under controlled circumstances, the present investigation was conducted in a glass house. There were four different treatments used: control (ambient O3 concentration of 40-45 ppb), elevated O3 (120 ppb), elevated O3 with silicic acid (0.1 mM), and elevated O3 with ascorbic acid (10 mM). Three varieties, viz. NM 20-21, NM 2006, and NM 2016, showcased tolerance to O3 toxicity. Our findings showed that ascorbic and silicic acid applications gradually increased yield characteristics such as seed yield, harvest index, days to maturity, and characteristics related to gas exchange such as transpiration rate, stomatal conductance, net photosynthetic activity, and water-use efficiency. Compared to the control, applying both growth regulators enhanced the mineral uptake across all treatments. Based on the findings of the current study, it is concluded that the subject mung bean genotypes responded to silicic acid treatment more efficiently than ascorbic acid to mitigate the harmful effects of O3 stress.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Experimental setup for the current study showing the experiment site (A), ambient O3 level (B), elevated O3 level (C), elevated O3 and ascorbic acid (D), and elevated O3 and silicic acid (E).
Figure 2
Figure 2
Under an elevated O3 level, effect of ascorbic acid and silicic acid on stomatal conductance (a), transpiration rate (b), water-use efficiency (c), and net photosynthetic rate (d) of mung bean varieties. T0, ambient O3 level; T1, elevated O3 level 120 ppb; T2, elevated O3 level + ascorbic acid; T3, elevated O3 level + silicic acid.
Figure 3
Figure 3
Under elevated O3 level, the effect of ascorbic acid and silicic acid on phosphorus (a), calcium (b), magnesium (c), nitrogen (d), and potassium (e) contents of mung bean varieties. T0, ambient O3 level; T1, elevated O3 level, 120 ppb; T2, elevated O3 level + ascorbic acid; T3, elevated O3 level + silicic acid.
Figure 4
Figure 4
Principal component analysis (a) and Pearson correlation (b) showing association among nutrients, gas exchange characteristics, and yield attributes in O3-stressed mung bean varieties treated with ascorbic acid and silicic acid. Net photosynthetic rate (Pn), stomatal conductance (c), transpiration rate (E), water-use efficiency (WUE), calcium (Ca), magnesium (Mg), phosphorus (P), potassium (K), nitrogen (N), seed yield (SY), harvest index (HI), and days to maturity (DM).
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