Combining high tolerance to drought with high tolerance to salinity in Egyptian wheat (Triticum aestivum L.) cultivars

Ismael, Ahmed Haki; Gomaa, Mohamed AbdelHamid

doi:10.1007/s42976-022-00264-3

Cited by 1 publication

(1 citation statement)

References 24 publications

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“…Both VuDREB2 and VuHSP17 are calcium-dependent kinase proteins, in response to thermic stress and water stress [75,78]. Also, this gene was reported as initiator of dehydration expression responses under individual heat, drought, and combined drought and heat stress in root of two banana genotypes [79] or linked to salt tolerance Triticum aestivum [80]. Zea mays under severe and intermediate water deficit stress, compared to normal irrigation, showed DREB-2 with higher values with 690 and 211% respectively [81].…”

Section: Discussionmentioning

confidence: 99%

Can Chlorophyll a Fluorescence and Photobleaching Be a Stress Signal under Abiotic Stress in Vigna unguiculata L.?

et al. 2022

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Greenhouse gas emissions continue raising the planet’s temperature by 1.5 °C since the industrial age, while the world population growth rate is 1.1%. So, studies aimed at food security and better land use are welcomed. In this paradigm, we choose Vigna unguiculata to test how it would behave in the face of severe abiotic stresses, such as drought and salt stress. This study shows that under abiotic stresses V. unguiculata tries to overcome the stress by emitting chlorophyll a fluorescence and promoting photobleaching. Thus, fewer photons are directed to photosystem I, to generate lethal reactive oxygen species. The antioxidant system showed a high activity in plants submitted to drought stress but fell in salt-stressed plants. Thus, the reductor power not dissipated by fluorescence or heat was captured and converted into hydrogen peroxide (H2O2) which was 2.2-fold higher in salt-stressed V. unguiculata plants. Consequently, the malondialdehyde (MDA) increased in all treatment. Compiling all data, we can argue that the rapid extinguishing of chlorophyll a fluorescence, mainly in non-photochemical quenching and heat can be an indicator of stress as a first defense system, while the H2O2 and MDA accumulation would be considered biochemical signals for plant defenses or plant injuries.

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