Different aspects of inhibition of growth and photosynthesis of maize (Zea mays L.) by the phosphonate herbicide sulphosate. 4. Influence on plants grown in controled [i.e. controlled] environment | Razliciti aspekti inhibicije rastenja i fotosinteze kukuruza (Zea mays L.) fosfonatnim herbicidom sulfosatom. 4. Dejstvo na biljke rasle u kontrolisanim uslovima
2007
Nikolic, B., Institut za zastitu bilja i zivotnu sredinu, Beograd (Serbia) | Milicevic, Z., Institut za zastitu bilja i zivotnu sredinu, Beograd (Serbia) | Djurovic, S., Institut za zastitu bilja i zivotnu sredinu, Beograd (Serbia) | Drinic, G., Institut za kukuruz Zemun Polje, Beograd - Zemun (Serbia) | Jovanovic, V., Institut za kukuruz Zemun Polje, Beograd - Zemun (Serbia) | Janjic, V., Institut za pesticide i zastitu zivotne sredine, Beograd (Serbia)
Effect of the herbicide sulphosate on the growth, accumulation and distribution of dry weight, photosynthesis and water regime in maize grown in controlled environment was investigated. The herbicide sulphosate was found to significantly lowered dry matter accumulation and slow down growth of maize plants. Dry weight accumulation, which ultimately determines growth, was found to correlate highly significantly with dry matter allocation to root and leaves, but this dependence was not unique. Under unfluence of sulphosate dry matter allocated from leaves to stem. That the phenomena result from a specific carbohydrate metabolism in stem of maize plants (not contain starch). The herbicide sulphosate significantly affect the status and functioning of the root and water regime of maize plants (lowered values of parameters Vr and RWC). Changes in photosynthesis and photosynthetic structures (degradation of photosynthetic pigments) under the effect of sulphosate precede changes in the water regime of leaves of maize plants. This effects must be seen as photoinhibition of photosynthesis with photooxidation of photosynthetic pigments (particularly Chla) under sulphosate-provoked stress. Light curves of different parameters of Chla fluorescence lowered under increased actimic light. ETR parameter of photosynthesis had sigmoid dependence of PAR, like to kinetic of photosynthetic fixation of CO2. Parameters of Chla fluorescence and photosynthesis can be used to monitor and assess the volume of functional senescence of photosynthesis in maize leaves both in the control plants and those exposed to sulphosate-caused stress.
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