Hidden hunger is affecting a significant portion of the population all over the globe and this problem must be eliminated to reduce disease burden and health disorders. Remobilization of some nutrients from vegetative tissues occurs during the senescence of developmental stages. Typically mass senescence occurs at the end of growing seasons. Most likely the remobilized nutrients move to develop seeds in the annual crop species. https://soilplantfood.com/hidden-hunger-a-major-threat-to-global-food-security/
Stages of Remobilization
The process of remobilization mainly occurs during reproductive and growth stages when root growing activities and nutrients uptake are reduced. Moreover, remobilization is greatly associated with foliar senescence and that causes increased bio-availability of nutrients for the organs of younger plants and thereby significantly contributes towards nutrient use efficiencies.
Estimation of Remobilization in Plants
Nutrient mobilization can be estimated by the apparent remobilization method that simply relies on the number of total nutrients that are present in different organs of plants at different times and developmental stages. Mostly immobilization occurs by the phloem pathways and all macronutrients other than Calcium can easily move through the phloem. While, micronutrients show moderate mobility in the phloem but there is an exception for manganese. https://soilplantfood.com/threat-level-due-to-micronutrient-malnutrition-and-possible-remediation-measures/
Seasonal Patterns Related to Micronutrient Remobilization
Different scientific studies have reported some seasonal patterns for the macronutrient remobilization in the wooden plant species. Deciduous trees more often store the nutrients in the winter season followed by their remobilization for sustaining leaf growth and plant development. While mature trees only focus on N remobilization during their growth stages. Whereas, in the evergreen trees there is remobilization of Nitrogen and Phosphorus from the leaves.
Micronutrients Remobilization to Reduce Hidden Hunger
Micronutrient remobilization in plants especially for edible plants has gained much less attention. There is an exigent urgent need to focus on this research aspect to improve the micronutrient levels in the edible plant parts. This approach will be efficient and effective to reduce hidden hunger on a sustainable basis. https://soilplantfood.com/role-of-zn-for-life-and-zn-deficiency-across-the-globe/
Nutrient Limitation and Remobilization
Under nutrients limitations, the phenomenon of nutrients remobilization is increased. Fe and Zn remobilization was increased when these micronutrients were withheld in the hydroponics solution culture at post-anthesis (Waters et al., 2009). About 70% of Zn in vegetative parts of wheat is remobilized (Grewal, 1999).
Role of Flag Leaves for Nutrient Remobilization
Flag leaves and lower leaves in wheat are major sources for remobilization of micronutrients while rice stems account for the Zn remobilization into grains (Wu et al., 2010). Differences in plant anatomy also account for contrasting observations.
Improving Mineral Contents of Grains
Remobilization of minerals from seeds can be used to increase the mineral contents of grains. However, all of the remobilized nutrients are not going to increase the concentration of mineral nutrients in seed grains. These nutrients are taken up by seeds during seed development and they pass through are passing through other plant parts to arrive at the grains.
Requirement of Collaborative Efforts
An exact understanding of the route of minerals translocation and the study of responsible genes are significant strategies for increasing the flux to seeds resulting in a greater amount of Fe and Zn into seeds. Therefore, there should be good collaboration between international researchers, scientists, and communities to reduce hidden hunger on a sustainable basis.