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Exogenous Micronutrients Modulate Morpho-physiological Attributes, Yield, and Sugar Quality in Two Salt-Stressed Sugar Beet Cultivars

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Abstract

Exogenously applied micronutrients (M) have been reported to boost salinity tolerance and improve yield and quality. However, very little is known about the effect of M mixture foliar application under saline soil condition. Our objective was to investigate the influences of M mixture foliar application on morpho-physiological traits, yield, and quality and nutritional status of sugar beet under saline (9.39 dS m−1) soil. Two consecutive (2018/2019–2019/2020) field trials were conducted on both Romulus and Francesca sugar beet cultivars treated with M mixture (0 ppm; [M0], 150 ppm [M150; 75 Fe (FeSO4), 50 Zn (ZnSO4), 25 Mn (MnSO4)], and 300 ppm [M300; 150 Fe (FeSO4) 100 Zn (ZnSO4), 50 Mn (MnSO4)]. M150 or M300 significantly boosted growth, water status, photosynthetic efficiency, nutritional status, and productivity of sugar beet. M300 increased root yield (RY) by 11.5% and 42.0% and true sugar yield (TSY) by 22.7% and 92.9% compared to M150 and M0, respectively. M300-treated plants had higher sucrose, true sugar, and quality index but lower loss sugar and non-sugar impurities M300 markedly improved sugar beet performance owing to increase leaf hydration status, photosynthetic efficiency, nutrients (K+, Fe2+, Zn2+, and Mn2+) uptake, and K+/Na+ ratio. Romulus exhibited enhanced growth, yield, and quality, reflecting more salt tolerance when compared with Francesca. Stepwise regression indicated plant fresh weight, SPAD chlorophyll, and leaves number plant−1 are the most influential RY- and TSY-attributed characteristics in salt-stressed sugar beet. M150 or M300 are more effective and may offer a potential economic alternative for salinity-stress alleviation in salt-stressed sugar beet.

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Abbreviations

M:

Micronutrients

LRT:

Leaf relative turgidity

MSI:

Membrane stability index

SPAD:

Soil-Plant-Analysis Development

F v /F m :

Efficiency of PSII maximal quantum

PPI:

Photosynthesis performance index

NPL:

Number of leaves plant−1

LAP:

Leaf area plant−1

RL:

Root length

RD:

Root diameter

PFW:

Plant fresh weight

TS:

True sugar

LS:

Loss sugar

QI:

Quality index

α-AN:

α-amino-nitrogen

AC:

Alkalinity coefficient

HI:

Harvest index

RY:

Root yield

TY:

Top yield

SY:

Sugar yield

TSY:

True sugar yield

LSY:

Loss sugar yield

Na+ :

Sodium

K+ :

Potassium

Fe2+ :

Iron

Zn2+ :

Zinc

Mn2+ :

Manganese

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Contributions

Taia, Rady, and Mekdad conceived and designed the experiment. Taia, Wael, and Shaaban handled the experiment and measured physiological indicators. Mekdad, Taia, and Shaaban analyzed the data and wrote the paper. All authors read and approved the final manuscript.

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Correspondence to Taia A. Abd El-Mageed.

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The authors declare no competing interests.

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Abd El-Mageed, T.A., Rady, M.O., Semida, W.M. et al. Exogenous Micronutrients Modulate Morpho-physiological Attributes, Yield, and Sugar Quality in Two Salt-Stressed Sugar Beet Cultivars. J Soil Sci Plant Nutr 21, 1421–1436 (2021). https://doi.org/10.1007/s42729-021-00450-y

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  • DOI: https://doi.org/10.1007/s42729-021-00450-y

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