0717
Zinc seed priming improves salt resistance in maize
M. Imran; B. Boelt; K.-H. Muhling
Original research article
Greenhouse study
Corn
Zinc
View source document
year
2018
Country
Germany
Abstract

Abstract: Salt stress is a major yield-limiting factor in crops by reducing nutrient uptake and plant growth. Under salt stress, decreased water and nutrient uptake results in nutrient imbalance in plants. In addition, at high pH in saline conditions, solubility of minerals is also reduced leading to low availability of certain nutrients. Perspectives to overcome these limitations by Zn seed priming were studied with maize plants exposed to NaCl as salt stress. Maize seeds were primed for 24 hr in deionized water and 4 m m ZnSO4·7Hsub2O solution (ZnP) and subsequently air-dried at room temperature before further use. The DTZ (diphenylthiocarbazone) staining method was used for showing Zns2+ localization in the seeds. Zn2+ and other nutrient concentrations in unprimed, water and ZnP seeds and maize plants were analysed by inductively coupled plasma mass spectroscopy (ICP-MS). Maize plants (cv. Sun star L.) were grown for 3 weeks in complete nutrient solution with or without salt stress (100 m m NaCl) under glasshouse conditions. Seed Zn2+ contents were increased after ZnP treatment by 600%. In maize seeds, most of the primed Zn2+ accumulated in the outer tissues (particularly, aleurone layer) of maize seed. Zn priming decreased the injurious effects of salt stress on plant growth. Under salt stress conditions, biomass production of plants from ZnP treatments was 25% higher compared to water priming treatment. Zn seed priming also improved mineral nutrient status of plants grown in both control and salt stress conditions. Plants from ZnP treatments also showed higher accumulation of Na+ in the shoots. This offers perspectives for using Zn seed priming for improving early seedling development and plant nutrient status of maize under salt stress conditions.

Keywords

maize; zinc seed priming; ZnSO4; salinity; NaCl; seed Zn; biomass; ICP-MS; DTZ; nutrient status; greenhouse

Outcomes reported
Biomass
Plant growth
Nutrient uptake
Physiological
Synthesis
Key insight
Zn seed priming improved maize biomass, nutrient status, and chlorophyll under salt stress in a glasshouse nutrient-solution study.
Limitations
This was a short-term glasshouse nutrient-solution study under salinity, so field transferability is limited.
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