Rice grain Fe, Mn and Zn accumulation: How important are flag leaves and seed number?

Sperotto, Raul Antônio; Ricachenevsky, Felipe Klein; Waldow, Vinícius de Abreu; Müller, Amanda; Dressler, Valderi L.; Fett, Janette Palma

doi:10.17221/841/2012-pse

Cited by 38 publications

(9 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cakmak et al (2010) explained role of improved protein synthesis and activity due to better enzymatic functions in plants, in increasing Zn concentration in vegetative parts and Zn translocation into grains. Kutman et al (2012), Barunawati et al (2013), Sperotto et al (2013) and Akram et al (2017) also found similar results when Zn was applied to different crops. Phytic acid is indigestible in human yet, its concentration is important for grain vigor and plant functions.…”

Section: Discussionsupporting

confidence: 53%

Agronomic zinc biofortification of wheat to improve accumulation, bioavailability, productivity and use efficiency

Akram¹,

Depar²,

Irfan³

2020

Eurasian Journal of Soil Science (Ejss)

View full text Add to dashboard Cite

Zinc (Zn) deficiency causes low crop production and malnutrition in human. Agronomic biofortification of food crops can resolve the issues of global food security and human nutrition on sustainable basis. Field experiments were conducted to improve Zn bioavailability, growth and yield of wheat in response to varying Zn application rates for two consecutive years (2016-17 & 2017-18). Significant increase in grain yield was recorded with the application of Zn. Highest grain yield (5.41 t ha-1) was recorded with the application of 5.00 kg Zn ha-1. Human available Zn fraction was also improved in response to Zn application. Zn application resulted in lowering phytate/Zn molar ration in wheat grains. Higher Zn accumulation (338.72 g ha-1) was observed by applying 7.5 kg Zn ha-1. Zinc application was found critical to meet internal (36.53 µg g-1) and external (4.48 kg Zn ha-1) Zn requirements to achieve near maximum yield of wheat. The results reinforced the concept of Zn fertilization to achieve better productivity and quality.

show abstract

Section: Discussionsupporting

confidence: 53%

Agronomic zinc biofortification of wheat to improve accumulation, bioavailability, productivity and use efficiency

Akram¹,

Depar²,

Irfan³

2020

Eurasian Journal of Soil Science (Ejss)

View full text Add to dashboard Cite

show abstract

“…The contribution of root absorption and root-to-grain transportation of Zn and Fe during the grain filling stage is minimal under field conditions compared to the greenhouse conditions with always high amount of available micronutrients and optimal water (Waters et al, 2009;Kutman et al, 2012;Sperotto et al, 2013;Cakmak and Kutman, 2018). This indicates that mobilization and retranslocation of the already deposited micronutrient reserves within the vegetative tissues to the grains are the key constraints affecting grain accumulation of micronutrients under field conditions.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Biofortification of Rice With Zinc, Iodine, Iron and Selenium Through Foliar Treatment of a Micronutrient Cocktail in Five Countries

et al. 2020

View full text Add to dashboard Cite

Widespread malnutrition of zinc (Zn), iodine (I), iron (Fe) and selenium (Se), known as hidden hunger, represents a predominant cause of several health complications in human populations where rice ( Oryza sativa L.) is the major staple food. Therefore, increasing concentrations of these micronutrients in rice grain represents a sustainable solution to hidden hunger. This study aimed at enhancing concentration of Zn, I, Fe and Se in rice grains by agronomic biofortification. We evaluated effects of foliar application of Zn, I, Fe and Se on grain yield and grain concentration of these micronutrients in rice grown at 21 field sites during 2015 to 2017 in Brazil, China, India, Pakistan and Thailand. Experimental treatments were: (i) local control (LC); (ii) foliar Zn; (iii) foliar I; and (iv) foliar micronutrient cocktail (i.e., Zn + I + Fe + Se). Foliar-applied Zn, I, Fe or Se did not affect rice grain yield. However, brown rice Zn increased with foliar Zn and micronutrient cocktail treatments at all except three field sites. On average, brown rice Zn increased from 21.4 mg kg –1 to 28.1 mg kg –1 with the application of Zn alone and to 26.8 mg kg –1 with the micronutrient cocktail solution. Brown rice I showed particular enhancements and increased from 11 μg kg –1 to 204 μg kg –1 with the application of I alone and to 181 μg kg –1 with the cocktail. Grain Se also responded very positively to foliar spray of micronutrients and increased from 95 to 380 μg kg –1 . By contrast, grain Fe was increased by the same cocktail spray at only two sites. There was no relationship between soil extractable concentrations of these micronutrients with their grain concentrations. The results demonstrate that irrespective of the rice cultivars used and the diverse soil conditions existing in five major rice-producing countries, the foliar application of the micronutrient cocktail solution was highly effective in increasing grain Zn, I and Se. Adoption of this agronomic practice in the target countries would contribute significantly to the daily micronutrient intake and alleviation of micronutrient malnutrition in human populations.

show abstract

“…According to Fangmeier et al (1999) , crops have completed the process of absorbing N from the soil at the flowering stage, and after flowering, all the N in the grains is derived from reallocation from vegetative organs. As reported by Sperotto et al (2013) , cutting off flag leaves increases the concentrations of Fe, Mn, and Zn in grains; these leaves may be preferential but not essential sources of minerals in grains. The elements supplied to the grain could be compensated for via remobilization from other leaves and stem sheathing or continuing uptake via the root system when cutting off the flag leaves.…”

Section: Discussionmentioning

confidence: 51%

Impact of Elevated CO2 and Reducing the Source-Sink Ratio by Partial Defoliation on Rice Grain Quality – A 3-Year Free-Air CO2 Enrichment Study

Gao

Jing

et al. 2021

Front. Plant Sci.

View full text Add to dashboard Cite

Evaluating the impact of increasing CO2 on rice quality is becoming a global concern. However, whether adjusting the source-sink ratio will affect the response of rice grain quality to elevated CO2 concentrations remains unknown. In 2016–2018, we conducted a free-air CO2 enrichment experiment using a popular japonica cultivar grown at ambient and elevated CO2 levels (eCO2, increased by 200 ppm), reducing the source-sink ratio via cutting leaves (LC) at the heading stage, to investigate the effects of eCO2 and LC and their interactions on rice processing, appearance, nutrition, and eating quality. Averaged across 3 years, eCO2 significantly decreased brown rice percentage (−0.5%), milled rice percentage (−2.1%), and head rice percentage (−4.2%) but increased chalky grain percentage (+ 22.3%) and chalkiness degree (+ 26.3%). Markedly, eCO2 increased peak viscosity (+ 2.9%) and minimum viscosity (+ 3.8%) but decreased setback (−96.1%) of powder rice and increased the appearance (+ 4.5%), stickiness (+ 3.5%) and balance degree (+ 4.8%) of cooked rice, while decreasing the hardness (−6.7%), resulting in better palatability (+ 4.0%). Further, eCO2 significantly decreased the concentrations of protein, Ca, S, and Cu by 5.3, 4.7, 2.2, and 9.6%, respectively, but increased K concentration by 3.9%. Responses of nutritional quality in different grain positions (brown and milled rice) to eCO2 showed the same trend. Compared with control treatment, LC significantly increased chalky grain percentage, chalkiness degree, protein concentration, mineral element levels (except for B and Mn), and phytic acid concentration. Our results indicate that eCO2 reduced rice processing suitability, appearance, and nutritional quality but improved the eating quality. Rice quality varied significantly among years; however, few CO2 by year, CO2 by LC, or CO2 by grain position interactions were detected, indicating that the effects of eCO2 on rice quality varied little with the growing seasons, the decrease in the source-sink ratios or the different grain positions.

show abstract

Rice grain Fe, Mn and Zn accumulation: How important are flag leaves and seed number?

Cited by 38 publications

References 24 publications

Agronomic zinc biofortification of wheat to improve accumulation, bioavailability, productivity and use efficiency

Agronomic zinc biofortification of wheat to improve accumulation, bioavailability, productivity and use efficiency

Simultaneous Biofortification of Rice With Zinc, Iodine, Iron and Selenium Through Foliar Treatment of a Micronutrient Cocktail in Five Countries

Impact of Elevated CO2 and Reducing the Source-Sink Ratio by Partial Defoliation on Rice Grain Quality – A 3-Year Free-Air CO2 Enrichment Study

Contact Info

Product

Resources

About