Energy Dispersive X-Ray Microanalysis of Element Distribution in Amaranth Seed.

Area of Science:

• Plant biology
• Agricultural science
• Biochemistry

Background:

• Amaranth seeds are a valuable nutritional source.
• Understanding mineral distribution is crucial for seed quality and utilization.
• Previous studies have not fully detailed the micronutrient localization within amaranth seeds.

Purpose of the Study:

• To investigate the precise distribution of key mineral nutrients within the amaranth seed structure.
• To correlate the localization of minerals with specific seed tissues and potential biochemical compounds.

Main Methods:

• Energy dispersive X-ray microanalysis (EDX) was employed.
• Scanning electron microscopy (SEM) was used for high-resolution imaging.
• EDX and SEM were combined to map elemental distribution within amaranth seeds.

Main Results:

• Phosphorus (P), potassium (K), and magnesium (Mg) were exclusively found in embryonic tissues (cotyledons and radicles).
• These elements (P, K, Mg) are likely associated with phytate, present as globoids in the embryo.
• Sulfur (S) showed even distribution throughout the embryonic tissue, including the procambium.
• Calcium (Ca) was predominantly located in the seed coats and the perisperm-embryo boundary.
• The localization of Ca suggests its association with pectins in cell walls.

Conclusions:

• Amaranth seed mineral nutrient distribution is highly specific to tissue type.
• Phosphorus, potassium, and magnesium are concentrated in the embryo, likely bound to phytate.
• Sulfur and calcium exhibit distinct localization patterns, suggesting roles in proteins and cell wall structures, respectively.