Different aspects of inhibition of growth and photosynthesis by the phosphonate herbicide sulphosate in maize (Zea mays L.). 5. Root manipulation of plants grown in controlled environment

Abstract

Effects of the herbicide sulphosate on growth, accumulation and distribution of dry weight and photosynthesis in maize plants grown in controlled environment and subjected to sourcesink manipulation at the root were studied. The findings indicate that growth and dry weight accumulation did not significantly correlate with any of the dry mass distribution parameters in those maize plants, but type of the root manipulation influenced parameters of plant growth. Also we found that plants with limited root growth has lower values of ETR parameter of photosynthesis, irrespective of herbicides treatment. As the root is place where cytokinins (plant hormons essential for maintaining photosynthetic structures) are synthesized, we assumed that content of cytokinins in the different manipulated roots influenced growth and photosynthesis of the plants irrespectively of exposition of the plants to the herbicide sulphosate.

U radu se razmatra dejstvo herbicida sulfosata na rastenje, akumulaciju i preraspodelu suve mase, kao i fotosintezu biljaka kukuruza raslih u kontrolisanim uslovima i izloženih manipulaciji statusa korena. Nalazi govore da rastenje i akumulacija suve mase ne korelišu značajno sa parametrima preraspodele suve mase biljaka kukuruza, ali tip manipulacije korenom utiče na rastenje biljaka. Nađeno je i da biljke sa ograničenjem rastenja korena imaju niže vrednosti ETR parametra fotosinteze, nezavisno od tretmana herbicidom. Pošto je koren mesto sinteze citokinina (fitohormon esencijalan za održanje fotosintetskih struktura), pretpostavljamo da sadržaj citokinina kod biljaka kukuruza sa različitim statusom korena utiče na rastenje i fotosintezu biljaka kukuruza, nezavisno od toga da li su ili nisu tretirane herbicidom sulfosatom.