Abstract
Low temperature is an important abiotic variable that inhibits plant growth and yield by restricting plant distribution on land. Cold-tolerant plant growth-promoting rhizobacteria (PGPR) improve nutrient absorption and availability in plants through biochemical and physiological mechanisms. Furthermore, they increase the tolerance of plants to cold stress. Different strains of bacteria were isolated from the roots of Suaeda nudiflora. These isolates were identified using 16SrDNA as Lysinibacillus fusiformis strain YJ4 and Lysinibacillus sphaericus strain YJ5 and were used to study their role in alleviating the harmful effect of cold stress. The two bacterial strains have the ability to solubilize phosphorus and to produce gluconic acid, phytohormones, catechol and hydroxymate siderophores. The present study aimed to study the effect of inoculating maize seeds with PGPR and its use to alleviate the adverse effects of cold stress. The results showed that cold stress (4 °C) reduces germination, growth criteria, photosynthetic pigments (i.e., chl a, chl b, and carotenoids), photosynthetic rate, membrane stability index, phytohormones (auxin and gibberellin), and mineral contents (N, P, K, and Ca) while increasing conductivity, malondialdehyde (MDA), lignin, cell viability, osmolytes (proline, glycine betaine, and soluble sugars), phenolic content, abscisic acid, 1‑aminocyclopropane-1-carboxylic acid (ACC) content and the antioxidant defense system in maize plants. Besides, the lignification, osmolytes, phenolic content, phytohormones, the enzymatic antioxidant defenses (i.e., superoxide dismutase, catalase, and phenylalanine ammonia-lyase), and mineral contents of maize plants increased after inoculation with L. fusiformis and L. sphaericus alone or in combination as compared to normal and cold stress conditions. In conclusion, the inoculation with L. fusiformis and L. sphaericus in maize plants induced resistance of osmotic and oxidative stress caused due to exposure to cold stress by upregulation of osmolytes, phenolics, phytohormones, and antioxidant enzymes. Also, L. sphaericus strains is more effective in tolerance to cold stress than L. fusiformis.
Zusammenfassung
Niedrige Temperaturen sind eine wichtige abiotische Variable, die das Pflanzenwachstum und den Ertrag hemmt, indem sie die Verteilung der Pflanzen auf dem Boden einschränkt. Kältetolerante pflanzenwachstumsfördernde Rhizobakterien (plant growth-promoting rhizobacteria, PGPR) verbessern die Nährstoffaufnahme und -verfügbarkeit in Pflanzen durch biochemische und physiologische Mechanismen. Außerdem erhöhen sie die Toleranz der Pflanzen gegenüber Kältestress. Verschiedene Bakterienstämme wurden aus den Wurzeln von Suaeda nudiflora isoliert. Diese Isolate wurden anhand der 16SrDNA als Lysinibacillus fusiformis-Stamm YJ4 und Lysinibacillus sphaericus-Stamm YJ5 identifiziert und zur Untersuchung ihrer Rolle bei der Abschwächung der schädlichen Auswirkungen von Kältestress verwendet. Die beiden Bakterienstämme sind in der Lage, Phosphor zu solubilisieren und Gluconsäure, Phytohormone, Catechin und Hydroxymat-Siderophore zu produzieren. Ziel der vorliegenden Studie war es, die Wirkung der Beimpfung von Maissaatgut mit PGPR und dessen Einsatz zur Abschwächung der negativen Auswirkungen von Kältestress zu untersuchen. Die Ergebnisse zeigten, dass Kältestress (4 °C) die Keimung, die Wachstumskriterien und die photosynthetischen Pigmente (Chl a, Chl b und Carotinoide), die Photosyntheserate, den Membranstabilitätsindex, die Phytohormone (Auxin und Gibberellin) und den Mineralstoffgehalt (N, P, K und Ca) reduziert, während die Leitfähigkeit, Malondialdehyd (MDA) Lignin, Zelllebensfähigkeit, Osmolyte (Prolin, Glycinbetain und lösliche Zucker), Phenolgehalt, Abscisinsäure, Gehalt an 1‑Aminocyclopropan-1-carbonsäure (ACC) und das antioxidative Abwehrsystem in Maispflanzen erhöht wurden. Außerdem stiegen die Lignifizierung, die Osmolyte, der Phenolgehalt, die Phytohormone, die enzymatische antioxidative Abwehr (d. h. Superoxid-Dismutase, Katalase und Phenylalanin-Ammoniak-Lyase) und der Mineralstoffgehalt der Maispflanzen nach der Inokulation mit L. fusiformis und L. sphaericus allein oder in Kombination im Vergleich zu normalen und Kältestressbedingungen. Zusammenfassend lässt sich sagen, dass die Inokulation mit L. fusiformis und L. sphaericus in Maispflanzen die Resistenz gegen osmotischen und oxidativen Stress, der durch Kältestress verursacht wird, durch die Hochregulierung von Osmolyten, Phenolen, Phytohormonen und antioxidativen Enzymen induziert. Außerdem sind die L. sphaericus-Stämme bei der Toleranz gegenüber Kältestress effektiver als L. fusiformis.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Yachana Jhaand Heba I. Mohamed. The first draft of the manuscript was written by Yachana Jha and Heba I. Mohamed and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Jha, Y., Mohamed, H.I. Inoculation with Lysinibacillus fusiformis Strain YJ4 and Lysinibacillus sphaericus Strain YJ5 Alleviates the Effects of Cold Stress in Maize Plants. Gesunde Pflanzen 75, 77–95 (2023). https://doi.org/10.1007/s10343-022-00666-7
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DOI: https://doi.org/10.1007/s10343-022-00666-7