Miranda Lasprilla, Diego:
ISBN 9783862471195

Effect of salt stress on physiological parameters of cape gooseberry, Physalis peruviana L. Berliner ökophysiologische und phytomedizinische Schriften Bd. 18 # Pb., 124 S.

SCHLAGWORTE:
Salt StressPhysalis peruviana L.
ape gooseberry
Andenbeere
Kapstachelbeere

The physiological response of cape gooseberry (Physalis peruviana L.) plants to stress caused by NaCl was studied. Seeds were subjected to increasing doses of NaCl to determine the effects of salt stress on imbibition and germination over the course of 299 hours. Under greenhouse conditions, growth parameters in the vegetative growth phase were determined, as well as concentrations of Na, Ca and K in leaf tissue in response to salinity. With plants grown in open field conditions in saline soil, a commercial mycorrhizal inoculum was used to determine their interaction with plant roots compared to non mycorrhized plants. Finally, the biochemical response associated with antioxidant activity and proline accumulation in leaf tissue in response to NaCl was investigated. Germination was not affected at concentrations of 30 and 60 mM NaCl, but in 120 mM was significantly reduced (38%). The development of leaf area was the growth parameter most affected by this type of stress, followed by the leaf area index (LAI), the unit leaf rate (URL), the leaf weight ratio (LWR) and the specific leaf area (SLA). The leaf K content increased with salinity reaching a peak at 90 mM; Ca remained stable for the different salt concentrations, while Na increased with increasing salinity. In general, NaCl stress caused no significant changes in the relationship between Ca2+/K+, whereas the K+/Na+ relationship decreased significantly with increasing salinity and was more pronounced with plant ageing. The study showed that inoculation with arbuscular mycorrhizal fungi can alleviate and compensate for the growth limitations imposed by salinity. Proline increased by two to three times when 120 mM NaCl was applied compared with the control plants. The total antioxidant activity increased steadily over the evaluation and was higher in salinized plants. The physiological responses observed permit us to classify the cape gooseberry as a species moderately tolerant to salinity.

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