Minerālās barošanās adaptīvie mehānismi un minerālelementu nodrošinājuma īpatnības jūras piekrastes augiem
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Latvijas Universitāte
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Minerālās barošanās adaptīvie mehānismi un minerālelementu nodrošinājuma īpatnības
jūras piekrastes augiem
Promocijas darbs
Darba mērķis ir izpētīt piekrastes reto augu sugu minerālās barošanās īpašības un augsnes apstākļus, kas
nosaka to augšanas sekmes. Piekrastes biotopi ir raksturīgi ar krasām sezonāla rakstura un mikrovides
apstākļu ietekmētām minerālelementu svārstībām un izteikti suboptimālām to koncentrācijām. Mitrājos
augsnes minerālelementu savastarpējās izmaiņas ir atkarīgas no applūšanas ar jūras ūdeni. Galvenie augu
augšanu ietekmējošie faktori ir zems slāpekļa nodrošinājums kāpās, un augsts sāļums mitrājos. Piekrastes
biotopu augi pielāgojušies augsnes heterogenitātei ar metabolisko plastiskumu, kas nodrošina optimālu
minerālo barošanos mainīga minerālā nodrošinājuma un sāļuma apstākļos. Adaptīvās īpašības heterogēniem
apstākļiem saistītas ar selektīvu jonu uzņemšanu un uzkrāšanu, vienlaicīgi aizsargājot šūnas pret osmotisko
stresu ar prolīnu.
Minerālā barošanās, jūras piekrastes biotopi, augsnes sāļums, augu adaptācijas.
Adaptive mechanisms of mineral nutrition and characteristics of mineral supply for sea-coast plants Promotion Paper The goal of the doctoral thesis was to explore mineral nutrition of rare plant species of the coastal zone and soil conditions that determine their growth. Dune habitats are characterized by extreme seasonal and fluctuations in mineral concentrations. Saline wetlands are affected by flooding with sea water. In soils of coastal habitats spatial and temporal heterogeneity of mineral nutrients as well as suboptimality of minerals together with soil salinity are main factors affecting mineral nutrition. Coastal plants are adapted to heterogeneity by metabolic plasticity allowing for optimum nutrition in conditions of changing mineral supply and soil salinity. Adaptive characteristics are the ability for selective uptake and deposition of nutrients together with protection against endogenous osmotic stress through accumulation of proline. Mineral nutrition, sea coast habitats, soil salinity, plant adaptations.
Adaptive mechanisms of mineral nutrition and characteristics of mineral supply for sea-coast plants Promotion Paper The goal of the doctoral thesis was to explore mineral nutrition of rare plant species of the coastal zone and soil conditions that determine their growth. Dune habitats are characterized by extreme seasonal and fluctuations in mineral concentrations. Saline wetlands are affected by flooding with sea water. In soils of coastal habitats spatial and temporal heterogeneity of mineral nutrients as well as suboptimality of minerals together with soil salinity are main factors affecting mineral nutrition. Coastal plants are adapted to heterogeneity by metabolic plasticity allowing for optimum nutrition in conditions of changing mineral supply and soil salinity. Adaptive characteristics are the ability for selective uptake and deposition of nutrients together with protection against endogenous osmotic stress through accumulation of proline. Mineral nutrition, sea coast habitats, soil salinity, plant adaptations.