Abstract

Temperature strongly influences the growth of maize, particularly in the early growth stages. The exogenous application of some amino acids has been proven to have a positive effect on plant growth and development under stressful conditions. The objective of the study was to evaluate the response of maize that was grown under an optimal and stress (fluctuating) temperature to L-Arginine (L-Arg) and Glycine (Gly) application. In the study, it was assumed that the exogenously applied amino acids would alleviate the adverse effects of temperature stress on the maize height, as well as on the biomass of shoots and roots. Ten concentrations of each amino acid from 0.006 mM to 9.0 mM were tested under constant temperature conditions 20–22 °C/23–25 °C (night/day) an fluctuating stress of rising and dropping temperatures between 12–15 °C (night) and 30–38 °C (day). The amino acids were applied to the crop at growth stages V3–V4. In plants that were obtained from seeds pre-treated with L-Arg and Gly, the amino acids increased both the length of radicles and the number of lateral roots. A large discrepancy between the effects of the two amino acids was observed after foliar application. Under optimal thermal conditions, L-Arg increased the mass of shoots and roots by 55–59%. Under stress conditions, root mass was increased even by 100% when compared to the control plants. The best results were recorded at concentrations of 6 mM and 3 mM. Plants that were treated with Gly concentrations generally reached the height of untreated plants or less. It was shown that Gly applied at concentrations of 0.2 mM to 3 mM has a negative effect on the fresh mass of the crop.

Highlights

  • Temperature stress is suggested as a primary growth-limiting factor for most crop plants

  • From the above-mentioned results, it could be concluded that the effects of the two amino acids on maize plants are different

  • In conditions where the plants were deprived of the stress factor, a very good effect of L-Arg on increasing the mass of shoots was observed at concentrations of 0.3 mM and 2.0 mM, whereas the mass of roots was stimulated by concentrations of

Read more

Summary

Introduction

Temperature stress is suggested as a primary growth-limiting factor for most crop plants. It can disturb ‘yield potential’, which refers to the productivity of a plant when resource capture and utilisation are not limiting, whereas ‘stress’ is defined as a factor that reduces either resource capture or utilisation [1,2]. Prolonged and even a transitional temperature stress interferes with many metabolic processes in plants. These are mostly evident in the cellular membranes and enzymes, as well as in the whole photosynthetic system. Elevated temperatures cause a state of dehydration by the rapid loss of water from the plant’s surface and reducing the chances of survival, and of further regular growth and development [4]

Objectives
Methods
Results
Conclusion
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call