Alleviating the Drought Stress in Wheat (Triticum aestivum L.) by Foliar Application of Amino Acid and Yeast

Foliar nitrogen (N) fertilizer application at later stages of wheat (Triticum aestivum L.) growth is an effective method of attenuating drought stress and improving grain filling. The influences or modes of action of foliar application of various nitrogen forms on wheat growth and grain filling need further research. The objective of this study was to examine the regulatory effects of various forms of foliar nitrogen [NO3–, NH4+, and CO(NH2)2] on wheat grain filling under drought stress and to elucidate their underlying mechanisms. The relative effects of each nitrogen source differed in promoting grain filling. Foliar NH4+-N application notably prolonged the grain filling period. In contrast, foliar application of CO(NH2)2 and NO3–-N accelerated the grain filling rate and regulated levels of abscisic acid (ABA), z-riboside (ZR), and ethylene (ETH) in wheat grains. Analysis of gene expression revealed that CO(NH2)2 and NO3–-N upregulated the genes involved in the sucrose–starch conversion pathway, promoting the remobilization of carbohydrates and starch synthesis in the grains. Besides, activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were increased, whereas the content of malondialdehyde (MDA) declined under foliar nitrogen application (especially NH4+-N). Under drought stress, enhancement of carbohydrate remobilization and sink strength became key factors in grain filling, and the relative differences in the effects of three N forms became more evident. In conclusion, NH4+-N application improved the antioxidant enzyme system and delayed photoassimilate transportation. On the other hand, foliar applications of NO3–-N and CO(NH2)2 enhanced sink capacity and alleviated drought stress injury in wheat.

Download Full-text

Role of DREB1A gene in Triticum aestivum L. seeds treated with different elicitors to delay drought stress

Research on Crops ◽

10.31830/2348-7542.2018.0001.46 ◽

2018 ◽

Vol 19 (4) ◽

Keyword(s):

Triticum Aestivum ◽

Drought Stress ◽

Triticum Aestivum L

Download Full-text

Effect of Drought Stress and Nitrogen Fertilizer on Yield and Its Components of Two Wheat Cultivars (Triticum aestivum L.)

Journal of Plant Production Sciences ◽

10.21608/jpps.2015.7394 ◽

2015 ◽

Vol 4 (1) ◽

pp. 13-20

Author(s):

Awad A. ◽

H. Abdel-Mottaleb ◽

M. Hammada ◽

M. Kotb ◽

M. Abass

Keyword(s):

Triticum Aestivum ◽

Drought Stress ◽

Nitrogen Fertilizer ◽

Triticum Aestivum L ◽

Wheat Cultivars

Download Full-text

Enhancement of drought tolerance in Triticum aestivum L. seedlings using Azospirillum brasilense NO40 and Stenotrophomonas maltophilia B11

Bulletin of the National Research Centre ◽

10.1186/s42269-021-00546-6 ◽

2021 ◽

Vol 45 (1) ◽

Author(s):

Wedad A. Kasim ◽

Mohamed E. H. Osman ◽

Mohamed N. Omar ◽

Samar Salama

Keyword(s):

Triticum Aestivum ◽

Drought Stress ◽

Drought Tolerance ◽

Azospirillum Brasilense ◽

Stenotrophomonas Maltophilia ◽

Protein Pattern ◽

Triticum Aestivum L ◽

Protein Patterns ◽

Wheat Seedlings ◽

Enhanced Production

Abstract Background The effectiveness of two PGPB; Azospirillum brasilense NO40 and Stenotrophomonas maltophilia B11 was investigated in enhancing the drought tolerance of wheat (Triticum aestivum L.) seedlings cultivar Gemiza9. The inoculated or uninoculated grains were sown in unsterilized sandy soil and watered normally untill the 8th day. Drought stress was initiated by completely withholding water for 7 days (until wilting). Samples were collected after 15 days from sowing to evaluate some growth criteria, damage and defense indicators and to analyze the roots’ protein pattern. Results The results showed that inoculating wheat seedlings with these strains significantly diminished the inhibitory effects of drought stress on the relative water content of roots, shoots and leaves; area of leaves; contents of pigments (chlorophyll a and b) and ascorbic acid; and on the protein patterns of roots. Moreover, the bacterial inoculation notably reduced the drought-induced damage indicated by lower leakage of electrolytes and less accumulation of Malondialdehyde and hydrogen peroxide, surprisingly with less enhanced production of proline and activities of catalase and peroxidase than their uninoculated counterparts. Under normal conditions, inoculating wheat plants with these PGPB resulted in significantly promoted growth and elevated contents of pigments and altered protein patterns of roots. Conclusion Overall, we can say that both Azospirillum brasilense NO40 and Stenotrophomonas maltophilia B11 were able to deactivate the growth inhibition in wheat seedlings to some extent, while maintaining a certain level of efficient protection against damage under drought stress.

Download Full-text