Study of the Interactive Effects of Calcium and Abscisic Acid on Drought Stressed Triticum aestivum Seedlings

Abstract

IN THEIR natural habitats, plants are continuously subjected to many severe environmental challenges including drought. In this study, the effects of drought on Triticum aestivum seedlings were assessed, and the alleviating roles and interactive effects of calcium (Ca 2+ ) and abscisic acid (ABA) to drought stress were studied. The results showed that pretreating wheat seedlings with calcium chloride (CaCl 2 ) or ABA led to alleviating most of the negative effects of 20% polyethylene glycol (PEG, as a drought imposing agent). Ca 2+ improved the growth criteria, photosynthetic activity, but ABA had no significant effects on growth parameters. Ca 2+ or ABA pretreatments have alleviated the toxic effects of the drought-induced oxidative stress which was marked with the reduction of MDA content. Ca 2+ and/or ABA reduced the PEGinduced catalase activity, and ascorbic acid content. The use of lanthanum chloride (LaCl 3 ) as a calcium channel blocker has confirmed the role of Ca 2+ in ameliorating the drought effects on plant. This study revealed that the application of Ca 2+ has increased the endogenous ABA level of the treated seedlings to a high extent exceeding that of PEG treatment itself suggesting that ABA requires Ca 2+ ions for its induction, and ABA is working downstream from Ca 2+ in the relevant signaling pathways activated by drought stress. The alleviating effects of Ca 2+ was prolonged to the yield stage. Overall, our results suggest that Ca 2+ (10 mM), and with a less extend ABA (0.1 mM), represent signaling agents that can partially alleviate drought stress in plants growing in dry environments.

Act of Malondialdehyde and Total Phenolic Content Under Bean Yellow Mosaic Virus Infection and Biostimulants Application

“…This work data indicated increased lipid peroxidation levels as indicated by accumulated MDA content in response to virus application. This finding is inconsistent with Sobhy et al, 2020 in Pb-stressed wheat and Sewelam et al (2017) in droughted wheat . TPC activity is the process of figuring out the amount of phenolic content in the samples Table (1).…”

Calcium Improves Germination and Growth of Sorghum bicolor Seedlings under Salt Stress

“…Application of Ca 2+ was able to reverse the effects of salt stress on sorghum seed germination especially at low concentrations (5 mM Ca 2+ ). Similarly, Ca 2+ also improved seed germination of Festuca ovina L. [ 24 ], Phragmites karka [ 39 ], Triticum aestivum [ 40 ], Urochondra setulosa [ 41 ], Pisum sativum [ 42 ], Solanum lycopersicon [ 43 , 44 ], and Vigna radiata [ 45 ].…”