【摘要】 以"两优培九"、"汕优63"杂交稻三叶期幼苗为材料,比较了镉胁迫对生长量,及光系统Ⅱ(PSⅡ)电子传递活性、丙二醛(MDA)含量、光合速率、过氧化物酶(POD)活性、过氧化氢酶(CAT)活性、超氧化物歧化酶(SOD)活性的影响及不同器官镉含量的变化。镉胁迫条件下,与"汕优63"相比较,"两优培九"幼叶光合速率和PSⅡ电子传递活性降低幅度较小,生长量较高;"两优培九"保护酶系统活性较高,MDA含量升高幅度较小;"两优培九"地上部分镉含量较低、根系含量较高。镉胁迫条件下,与"汕优63"相比较,"两优培九"根系的生长速率较高,抗镉胁迫的能力较强。更多还原

【Abstract】 Effects of Cd²⁺ stress on growth,protective enzymes,MDA content,Cd²⁺ content and photosynthetic characters of rice were studied.The results show that in the rice seedlings of Shanyou-63 under Cd²⁺ stress,the electron activity of PSⅡ and the photosynthetic rate decreased;the content of MDA increased;the activities of protective enzymes increased at first and decreased afterwards,whereas in the rice seedlings of Liangyoupeijiu,in comparison,the activity of protective enzymes was relatively higher;the rising rate of MDA was lower;the photosynthetic rate and the electron activity of PSⅡ declined at a lower rate;The Cd²⁺ content was lower in the aerial part and higher in the underground part.The experiment demonstrates that Liangyoupeijiu is more tolerant to Cd²⁺ pollution than Shanyou 63.更多还原