Effect of elevated temperature and moisture stress on gas exchange parameters of Trianthema portulacastrum L.

摘要

Rising carbon dioxide (CO_2) concentrations, increasing ambient temperature and associated precipitation are major concerns for future weed management and crop production. Weeds with C_3 and C_4 photosynthetic pathways may exhibit differential responses to higher CO_2 levels and temperatures, which can affect the dynamics of crop-weed competition. Since photosynthetic biochemistry depends on climatic factors, the photosynthetic pathway of weeds C_3 and C_4 had shown varied responses to elevated concentrations of CO_2 and elevated temperature, the main source of carbon for plants, directly impacts gas exchange parameters at increased concentration of temperature and CO_2. 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.