Shade pretreatment enhanced drought resistance of soybean

Asghar, Muhammad Ahsan; Du, Junbo; Jiang, Hengke; Li, Yan; Sun, Xin; Shang, Jing; Liu, Jiang; Liu, Weiguo; Imran, Shakeel; Iqbal, Nasır; Ahmad, Bushra; Hussain, Sajad; Liu, Yu; Liu, Chunyan; Yang, Wenyu

doi:10.1016/j.envexpbot.2019.103952

Cited by 27 publications

(23 citation statements)

References 55 publications

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“…At the V5 stage, fully expanded leaves were collected, covered with aluminium foil and kept in an icebox to prevent direct light interception and kept in the dark for 30 min to open reaction centres. Leaves were then placed in a measuring chamber to measure fluorescence parameters: maximum quantum yield in the dark ( F v /F m ), maximum quantum yield in the light ( F v ’ /F m ' ), photochemical quenching (qP) and electron transport rate (ETR) following Asghar et al (2020). Maximum fluorescence ( F m ) was determined using a saturating blue pulse (10 Hz), time of light adaptation was 15–20 min.…”

Section: Methodsmentioning

confidence: 99%

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Optimal NH₄⁺/NO₃⁻ ratios enhance the shade tolerance of soybean seedlings under low light conditions

et al. 2021

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In the maize–soybean intercropping system, shade is the major chronic restraint that affects normal growth of soybean. Different spatial patterns of this system affect the microclimate of soybean through shading from maize plants. However, the negative impacts of shading stress can be mitigated by providing optimal ratios of different fertilizers. Therefore, to test this hypothesis, soybean plants were grown under different light conditions (normal light or shade) to evaluate the response to varying NH4+/NO3− ratios. Seeds of soybean (Glycine max L. cv. Nan‐99‐6) were grown in nutrient solution with a total concentration of 5 mM N using different NH4+/NO3− ratios (T0 = 0:0, T1 = 0:100, T2 = 25:75, T3 = 50:50 and T4 = 75:25) for 40 days in a greenhouse at PPFD 320.95 μmol m−2 s−1 (low light) or 967.53 μmol m−2 s−1 (normal light). Under low light, growth and photosynthesis of soybean seedlings significantly decreased as compared to normal light conditions. However, the optimal ratios of NH4+/ NO3− improved growth and photosynthesis of soybean seedlings under both light conditions. Our results indicated that soybean seedlings supplied with optimal NH4+/NO3− ratios (25:75 and 50:50) have maximum biomass yield, chlorophyll pigments, leaf gas exchange, photochemical activity and root growth as compared to low and high NH4+/NO3− ratios (T1 and T4). High ratios of NH4+/NO3− (T4) resulted in reduced plant growth due to nutrient accumulation in plant tissues; therefore, we suggest that optimal ratios of NH4+/NO3− (T2 and T3) can enhance the shade tolerance of soybean seedlings.

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Section: Methodsmentioning

confidence: 99%

“…The supernatant was collected in 50‐ml tubes (main solution) and made up to 50 ml with 80% ethanol. Charcoal solution (activated carbon) was used to de‐colour samples, then samples were filtered through filter paper for further analysis (Asghar et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

Optimal NH₄⁺/NO₃⁻ ratios enhance the shade tolerance of soybean seedlings under low light conditions

et al. 2021

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“…Under shade conditions, the survival of Ghanaian trees is higher than in high light suggesting that shade enhances plant performance under drought stress conditions (Amissah, Mohren, Kyereh, & Poorter, 2015). The activity of osmoprotectants and antioxidants was also increased under shade conditions suggesting that pre‐treatment with shade might help to overcome the drastic effects of drought in soybeans in dense cropping systems (Asghar et al, 2020).…”

Section: Light and Drought Stressmentioning

confidence: 99%

Light acts as a stressor and influences abiotic and biotic stress responses in plants

Roeber

Bajaj

Rohde

et al. 2020

Plant Cell & Environment

174

104

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Light is important for plants as an energy source and a developmental signal, but it can also cause stress to plants and modulates responses to stress. Excess and fluctuating light result in photoinhibition and reactive oxygen species (ROS) accumulation around photosystems II and I, respectively. Ultraviolet light causes photodamage to DNA and a prolongation of the light period initiates the photoperiod stress syndrome. Changes in light quality and quantity, as well as in light duration are also key factors impacting the outcome of diverse abiotic and biotic stresses. Short day or shady environments enhance thermotolerance and increase cold acclimation. Similarly, shade conditions improve drought stress tolerance in plants. Additionally, the light environment affects the plants' responses to biotic intruders, such as pathogens or insect herbivores, often reducing growth‐defence trade‐offs. Understanding how plants use light information to modulate stress responses will support breeding strategies to enhance crop stress resilience. This review summarizes the effect of light as a stressor and the impact of the light environment on abiotic and biotic stress responses. There is a special focus on the role of the different light receptors and the crosstalk between light signalling and stress response pathways.

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“…As it can be observed in Figure 5 that the non-structural carbohydrates contents in stem showed the increasing trend and then decreased with the growth process of soybeans. Previous studies have shown that non-structural carbohydrates in the stems were not only providing energy to plants but also promote the accumulation of structural carbohydrates and partly transported to the seeds when the soybean was in the filling stage [38,39,76]. Our results showed that the starch, soluble sugar, and sucrose contents peak value time of PD1 treatment in strip intercropping were the same as that of monocropping; however, their contents were much higher than that of PD2 and PD3 treatments, which showed that a good light environment was beneficial to increase their contents.…”

Section: Lodging Resistance and Carbohydrates Contentsmentioning

confidence: 99%

“…Different cultivation patterns have a great effect on plant photosynthesis; likewise, intercropping shading between different crops leads to a lower photosynthetic rate of shaded crops [37]. In multiple planting densities, mutual shading of different density plants leads to changes in the spatial structure of the plant population and photosynthetic rate, and ultimately the accumulation of carbohydrates in the stem that causes lodging easily [38][39][40][41]. At present, planting high density has already become one of the key measures to excavate the potential high yield of crops among the various cultivation methods [42,43].…”

Section: Introductionmentioning

confidence: 99%

Effects of Multiple Planting Densities on Lignin Metabolism and Lodging Resistance of the Strip Intercropped Soybean Stem

et al. 2020

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The shading of maize and self-shading are the key factors affecting the stem lignin biosynthesis and lodging resistance of soybean at middle and later growth stages in the strip intercropping system. A study was designed to explore the regulation mechanism of lignin metabolism and different planting densities; PD1, PD2, and PD3 were used having a total number of 17 plants m−2, 20 plants m−2, and 25 plants m−2, respectively, on the lodging resistance of strip intercropped soybean stem. Our results depicted that the lower planting density (PD1) appropriately promoted the leaf photosynthesis activities (Pn), increase the activity of lignin-related enzymes and the accumulation of carbohydrates in stems, and eventually enhanced the lodging resistance of the strip intercropped soybean stem. Correlation analysis also showed that the lodging resistance index of soybean stem was significantly correlated with the available light for soybean canopy and Pn strip intercropped soybean stem characteristics and activities of enzymes related to lignin synthesis among the different planting densities. The findings of our research will be useful in future studies to understand the relationship between different light environment, planting densities, and lodging resistance of intercropped soybean and also guide the optimum planting density in maize–soybean intercropping system.

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Shade pretreatment enhanced drought resistance of soybean

Cited by 27 publications

References 55 publications

Optimal NH₄⁺/NO₃⁻ ratios enhance the shade tolerance of soybean seedlings under low light conditions

Optimal NH₄⁺/NO₃⁻ ratios enhance the shade tolerance of soybean seedlings under low light conditions

Light acts as a stressor and influences abiotic and biotic stress responses in plants

Effects of Multiple Planting Densities on Lignin Metabolism and Lodging Resistance of the Strip Intercropped Soybean Stem

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Shade pretreatment enhanced drought resistance of soybean

Cited by 27 publications

References 55 publications

Optimal NH4+/NO3− ratios enhance the shade tolerance of soybean seedlings under low light conditions

Optimal NH4+/NO3− ratios enhance the shade tolerance of soybean seedlings under low light conditions

Light acts as a stressor and influences abiotic and biotic stress responses in plants

Effects of Multiple Planting Densities on Lignin Metabolism and Lodging Resistance of the Strip Intercropped Soybean Stem

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Optimal NH₄⁺/NO₃⁻ ratios enhance the shade tolerance of soybean seedlings under low light conditions

Optimal NH₄⁺/NO₃⁻ ratios enhance the shade tolerance of soybean seedlings under low light conditions