EFFECT OF ELEVATED TEMPERATURE AND MOISTURE STRESS ON GAS EXCHANGE PARAMETERS OF TRIANTHEMA PORTULACASTRUM L.Govindaraj T. and P. Murali Arthanari
Rising carbon dioxide (CO2) concentrations, increasing ambient temperature and associated precipitation are major concerns for future weed management and crop production. Weeds with C3 and C4 photosynthetic pathways may exhibit differential responses to higher CO2 levels and temperatures, which can affect the dynamics of cropâweed competition. Since photosynthetic biochemistry depends on climatic factors, the photosynthetic pathway of weeds C3 and C4 had shown varied responses to elevated concentrations of CO2 and elevated temperature, the main source of carbon for plants, directly impacts gas exchange parameters at increased concentration of temperature and CO2. This study evaluated the performance of Trianthema portulacastrum gas exchange parameter viz., photosynthetic rate, stomatal conductance, transpiration rate had positively interacted with increased temperature, excess moisture and also under drought condition. Hence, under this climatic condition, the Trianthema portulacastrum very well survives with adverse environmental conditions also by reduced transpiration rate and photosynthetic rate.