Influence of arsenic (As) in As tolerant and sensitive rice genotypes based chloroplastic pigments, leaf gas exchange attributes and their influence on carbohydrate metabolism were investigated in the present study. As retards growth of crop plants and increase several health ailments by contaminating food chain. Photosynthetic inhibition is known to be the prime target of As toxicity due to over-production of ROS. Hydroponically grown rice seedlings of twelve cultivars were exposed to 25, 50, and 75 μM arsenate (AsV) that exerted negative impact on plastidial pigments content and resulted into inhibition of Hill activity. Internal CO₂ concentration lowered gradually due to interference of As with stomatal conductance and transpiration rate that subsequently led to drop in net photosynthesis. Twelve contrasting rice genotypes responded differentially to As(V) stress. Present study evaluated As tolerant and sensitive rice cultivars with respect to As(V) imposed alterations in pigments content, photosynthetic attributes along with sugar metabolism. Starch contents, the principle carbohydrate storage declined differentially among As(V) stressed test cultivars, being more pronounced in cvs. Swarnadhan, Tulaipanji, Pusa basmati, Badshabhog, Tulsibhog and IR-20 compared to cvs. Bhutmuri, Kumargore, Binni, Vijaya, TN-1 and IR-64. Therefore, the six former cultivars tried to adapt defensive mechanisms by accumulating higher levels of reducing and non-reducing sugars to carry out basal metabolism to withstand As(V) induced alterations in photosynthesis. This study could help to screen As tolerant and sensitive rice genotypes based on their photosynthetic efficiency in As polluted agricultural fields to reduce As contamination assisted ecotoxicological risk.

在本研究中，研究了砷（As）对基于水稻耐性和敏感基因型的叶绿素色素的影响，叶片气体交换属性及其对碳水化合物代谢的影响。由于污染了食物链，延缓了农作物的生长并增加了一些健康疾病。由于ROS的过量产生，已知光合抑制是As毒性的主要目标。将十二个品种的水培水稻幼苗暴露于25、50和75μM砷酸（AsV）中，这会对质体色素含量产生负面影响，并导致Hill活性受到抑制。内部CO ₂由于砷对气孔导度和蒸腾速率的干扰，其浓度逐渐降低，随后导致净光合作用下降。十二个对比水稻基因型对As（V）胁迫的反应不同。本研究评估了耐As和敏感水稻品种对As（V）的色素含量，光合特性以及糖代谢的影响。淀粉含量，主要的碳水化合物存储量在受As（V）胁迫的试验品种中有所下降，在cvs中更为明显。与cvs相比，Swarnadhan，Tulaipanji，Pusa basmati，Badshabhog，Tulsibhog和IR-20。Bhutmuri，Kumargore，Binni，Vijaya，TN-1和IR-64。因此，这六个前品种试图通过积累更高水平的还原糖和非还原糖来进行防御代谢，以适应基础防御机制，从而抵御As（V）诱导的光合作用变化。这项研究可以帮助他们基于砷在受污染的农田中的光合作用效率筛选耐性和敏感性水稻基因型，以减少砷污染有助于生态毒理学风险。