Foliar application: from plant nutrition to biofortification

Alshaal, Tarek; El-Ramady, Hassan

doi:10.21608/jenvbs.2017.1089.1006

Cited by 78 publications

(62 citation statements)

References 61 publications

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“…However, seedlings on the Gelrite® culture showed severe symptoms of senescence from the third week onwards and died after 4-5 weeks ( Figure 1D). Although this medium resulted in fast seed germination, it proved detrimental to seedling development, as the lack of essential nutrients prevents plants completing their life cycle (Taiz et al, 2015;Alshaal and El-Ramady, 2017). Koné et al (2015) also reported the lowest growth performance of V. subterreana seedlings grown on a control medium without inorganic salts.…”

Section: Seedlings Derived From Seeds Germinated Directly On Gelrite®mentioning

confidence: 99%

In vitro seed germination and seedling performance of Hibiscus coddii subsp. barnardii

et al. 2020

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Hibiscus coddii subsp. barnardii is an endemic South African plant species with ornamental potential. The limited plant availability in nature and restrictions on the collection of living plant material (cuttings) for cultivation purposes, necessitated the development of a protocol for in vitro seed propagation to ensure all year round ex vitro establishment of plants. The effect of culture medium on seed germination and seedling performance was therefore studied. Various types of sterile seed cultures, namely moist filter paper bridges, five different strengths (¼, ½, –, full, 1¼) of PGR-free Murashige and Skoog medium (MS) and solid Gelrite® medium (control) were investigated. High germination percentages (85%-98%) were found in all three seed cultures, although seeds germinated on filter paper, Gelrite ® and lower strengths (¼, ½, –) of MS medium had shorter mean germination times (1.6-2.8 days) than those germinated on full and 1¼ strengths (3.5-4 days) of MS medium. Furthermore, the growth performance of seedlings varied with the strength of MS medium and was best supported on full strength MS medium, whereas ¼ and ½ strength MS media and Gelrite® cultures were detrimental for seedling growth.

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Section: Seedlings Derived From Seeds Germinated Directly On Gelrite®mentioning

confidence: 99%

In vitro seed germination and seedling performance of Hibiscus coddii subsp. barnardii

et al. 2020

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“…It is affected by endogenous (leaf anatomy), exogenous (pH, soil), as well as environmental factors. After foliar Fe application, it takes the plants 10–20 days to absorb 50% of the micronutrient (Alshall and El-Ramady, 2017). In contrast with the promising results of foliar fertilizer application to improve grain Zn in rice (Cakmak, 2008; Cakmak and Kutman, 2017), the increase of grain Fe using foliar fortification was modest.…”

Section: Biofortification: Agronomic Vs/and Genetic In Rice and Wheatmentioning

confidence: 99%

Genetic Biofortification to Enrich Rice and Wheat Grain Iron: From Genes to Product

Ludwig

Slamet‐Loedin

2019

Front. Plant Sci.

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The micronutrient iron (Fe) is not only essential for plant survival and proliferation but also crucial for healthy human growth and development. Rice and wheat are the two leading staples globally; unfortunately, popular rice and wheat cultivars only have a minuscule amount of Fe content and mainly present in the outer bran layers. Unavailability of considerable Fe-rich rice and wheat germplasms limits the potential of conventional breeding to develop this micronutrient trait in both staples. Agronomic biofortification, defined as soil and foliar fertilizer application, has potential but remains quite challenging to improve grain Fe to the significant level. In contrast, recent accomplishments in genetic biofortification can help to develop Fe-enriched cereal grains to sustainably address the problem of “hidden hunger” when the roadmap from proof of concept to product and adoption can be achieved. Here, we highlight the different genetic biofortification strategies for rice and wheat and path to develop a product.

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“…Bioavailable biogenic elemental Se (BioSe), for example, is widespread in the microbial environment ( Winkel et al, 2012 ). For roles in foliar biofortification, Se and I nanoparticles need to be well characterised, including particle size: stomatal openings are about 20 nm in diameter, thus movement of particles larger than this is problematic ( Alshaal and El-Ramady, 2017 ).…”

Section: Biofortification Of Cereals With Selenium and Iodine Could Rmentioning

confidence: 99%

Biofortification of Cereals With Foliar Selenium and Iodine Could Reduce Hypothyroidism

Lyons

2018

Front. Plant Sci.

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Concurrent selenium and iodine deficiencies are widespread, in both developing and developed countries. Salt iodisation is insufficient to ensure global iodine adequacy, with an estimated one-third of humanity at risk of hypothyroidism and associated iodine deficiency disorders (IDD). Agronomic biofortification of food crops, especially staples such as cereals, which are consumed widely, may be an effective component of a food system strategy to reduce selenium and iodine malnutrition. Iodine and selenium are needed in the optimum intake range for thyroid health, hence joint biofortification makes sense for areas deficient in both. Foliar application is recommended as the most effective, efficient, least wasteful method for selenium and iodine biofortification. Currently, selenium is easier to increase in grain, fruit, and storage roots by this method, being more phloem mobile than iodine. Nevertheless, strategic timing (around heading is usually best), use of surfactants and co-application with potassium nitrate can increase the effectiveness of foliar iodine biofortification. More research is needed on iodine transporters and iodine volatilisation in plants, bioavailability of iodine in biofortified plant products, and roles for nano selenium and iodine in biofortification. For adoption, farmers need an incentive such as access to a premium functional food market, a subsidy or increased grain yield resulting from possible synergies with co-applied fertilisers, enhancers, fungicides, and insecticides. Further research is needed to inform these aspects of foliar agronomic biofortification.

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Foliar application: from plant nutrition to biofortification

Cited by 78 publications

References 61 publications

In vitro seed germination and seedling performance of Hibiscus coddii subsp. barnardii

In vitro seed germination and seedling performance of Hibiscus coddii subsp. barnardii

Genetic Biofortification to Enrich Rice and Wheat Grain Iron: From Genes to Product

Biofortification of Cereals With Foliar Selenium and Iodine Could Reduce Hypothyroidism

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