Enhancing the salt tolerance of commercial Eucalyptus hybrid seedlings in preparation for reclamation of inland salinity areas

Leksungnoen, Nisa; Andriyas, Tushar

doi:10.1007/s10342-019-01204-3

Cited by 6 publications

(1 citation statement)

References 42 publications

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“…Reforestation has been a strategy used to counter such self-reinforcing processes. Fast-growing and salinity-tolerant tree species have shown potential to provide soil stabilization with wood production and could be a long-term solution to restore vegetation in marginal areas and sites affected by salinity [ 9 , 10 , 11 , 12 ]. For example, Eucalyptus, a multipurpose woody species that develops an extended deep root system, is suitable for many landscape applications including reclamation of dry arid saline lands.…”

Section: Introductionmentioning

confidence: 99%

Differences in Ionic, Enzymatic, and Photosynthetic Features Characterize Distinct Salt Tolerance in Eucalyptus Species

Balti

Abassi

Dietz

et al. 2021

Plants

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In the face of rising salinity along coastal regions and in irrigated areas, molecular breeding of tolerant crops and reforestation of exposed areas using tolerant woody species is a two-way strategy. Thus, identification of tolerant plants and of existing tolerance mechanisms are of immense value. In the present study, three Eucalyptus ecotypes with potentially differential salt sensitivity were compared. Soil-grown Eucalyptus plants were exposed to 80 and 170 mM NaCl for 30 days. Besides analysing salt effects on ionic/osmotic balance, and hydrolytic enzymes, plants were compared for dynamics of light-induced redox changes in photosynthetic electron transport chain (pETC) components, namely plastocyanin (PC), photosystem I (PSI) and ferredoxin (Fd), parallel to traditional chlorophyll a fluorescence-based PSII-related parameters. Deconvoluted signals for PC and Fd from PSI allowed identification of PC and PSI as the prime salinity-sensitive components of pETC in tested Eucalyptus species. Eucalyptus loxophleba portrayed efficient K+-Na+ balance (60–90% increased K+) along with a more dynamic range of redox changes for pETC components in old leaves. Young leaves in Eucalyptus loxophleba showed robust endomembrane homeostasis, as underlined by an increased response of hydrolytic enzymes at lower salt concentration (~1.7–2.6-fold increase). Findings are discussed in context of salinity dose dependence among different Eucalyptus species.

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