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Tolerance to salt stress in maize callus lines with different polyamine content
M Zacchini1, A Marotta1, M de Agazio1
1Istituto di Biochimica ed Ecofisiologia Vegetali-CNR, Via Salaria Km 29.300, I-00016 Monterotondo Scalo, Rome, Italy Fax no.: +39-6-9064492 E-mail: dema@isc.mlib.cnr.it, , , , , , IT.
Plant Cell Reports
|February 9, 2019
Summary
Maize (Zea mays L.) callus lines with low polyamine (PA) levels showed salt tolerance, while high-PA lines were sensitive. Putrescine levels differed between tolerant and sensitive lines under salt stress.
Area of Science:
- Plant Biotechnology
- Molecular Biology
- Agricultural Science
Background:
- Polyamines (PAs) are crucial for plant growth and stress response.
- Maize (Zea mays L.) is a vital global crop susceptible to abiotic stresses like salinity.
- Understanding PA's role in maize salt tolerance can improve crop resilience.
Purpose of the Study:
- To investigate the relationship between polyamine levels and salt tolerance in maize callus cultures.
- To identify physiological and genetic differences between salt-tolerant and salt-sensitive maize lines.
Main Methods:
- Selection of maize callus lines with high and low polyamine levels.
- Exposure of callus lines to varying NaCl concentrations (0% and 1%).
- Measurement of relative growth rates and polyamine content.
- Analysis of genetic variation using Random Amplification of Polymorphic DNA (RAPD) markers.
Main Results:
- Low-PA maize callus lines exhibited tolerance to 1% NaCl stress.
- High-PA lines demonstrated sensitivity to salt stress, with increased putrescine content.
- A genetic polymorphism (550-bp band) was detected between the selected callus lines via RAPD analysis.
Conclusions:
- Polyamine levels significantly influence salt tolerance in maize callus.
- Putrescine accumulation is associated with salt sensitivity in maize.
- Genetic variation exists between maize callus lines with differing salt tolerance and polyamine profiles.
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