水稻叶片的生理性状和形态特征受铬胁迫的影响研究OA

Using two rice varieties,Suijing 309(SJ309)and Longqingdao 31(LQD31),as experimental materials,the effects of chromium(Cr)stress on the physiological traits and morphological characteristics of rice leaves were investigated.The results showed that Cr was primarily enriched in the roots of rice,and SJ309 was more effective than LQD31 in reducing the absorption and translocation of Cr.Under high-concentration Cr stress(100 μmol/L),the physiological characteristics such as stomatal conductance,transpiration rate,water use efficiency,and photosynthetic pigments decreased in both varieties,while leaf vapor pressure deficit,intercellular CO2 concentration,and malondialdehyde(MDA)content increased.After Cr stress treatment,only LQD31 exhibited an increase in the stomatal area of guard cells and closure of the stomatal aperture,whereas no significant changes were observed in SJ309.Compared with SJ309,the contents of abscisic acid(ABA)and salicylic acid(SA)in LQD31 increased significantly,leading to the overexpression of NCED1 and NCED2 genes involved in the regulation of stomatal aperture,which indicated that LQD31 was more sensitive to Cr stress.Furthermore,Cr stress significantly increased the density and length of non-glandular trichomes in SJ309,suggesting its ability to withstand UV damage and various environmental stresses.In summary,SJ309 demonstrates superior tolerance to Cr stress,and its hyperaccumulation characteristics can be utilized for the phytoremediation of Cr-contaminated soils.