Zn胁迫对茄子幼苗生长、光合作用和抗氧化系统的影响

Effects of Zn stress on the growth,photosynthesis and antioxidant system of eggplant(Solanum melongena L.) seedlings

以‘沪茄08-11'为材料,研究了5 mmol/L、10 mmol/L和15 mmol/LZn^(2+)胁迫对茄子幼苗生长、光合作用和抗氧化系统的影响。结果表明:5 mmol/L Zn^(2+)胁迫下,茄子幼苗株高、茎粗、地上部鲜重、根系鲜重、净光合速率(P_n)、气孔导度(G_s)、蒸腾速率(T_r)、PSII最大光化学效率(F_v/F_m)、PSII潜在活性(F_v/F_o)、抗氧化酶(SOD、CAT)活性和脯氨酸含量均显著升高,叶片中叶绿素含量、胞间CO_2浓度(C_i)、PSII天线转化效率(F_v′F_m′)、光化学荧光猝灭系数(q_p)、实际光化学效率(Φ_(PSII))和非光化学荧光猝灭系数(q_N)、POD活性、丙二醛(MDA)含量和超氧阴离子(O_2^-·)产生速率均无显著变化;10 mmol/L和15 mmol/L Zn^(2+)胁迫下,以上生长指标、叶绿素含量和光合指标(除C_i、q_N变化较复杂外)均显著降低,抗氧化酶活性、MDA含量和O_2^-·产生速率均显著升高,且Zn^(2+)浓度越高,变化幅度越大。

The effects of Zn（2＋） stress（5,10 and 15 mmol/L）on the growth,photosynthesis and antioxidant system of eggplant（Solanum melongena L.） seedlings of ＇ Huqie 08-11＇ were studied.The results showed that under 5 mmol/L Zn（2＋） stress,the plant height,stem diameter,shoot fresh weight,root fresh weight,photosynthetic rate（P_n）,stomatal conductance（G_s）,transpiration rate（T_r）,photochemical maximum efficiency of PSII（F_v/F_m）.potential photochemical efficiency（F_v/F_o）,activities of antioxidant enzyme（SOD,CAT） and contents of proline significantly increased,while the chlorophyll contents,intercellular CO_2 concentration（C_i）,efficiency of excitation captured by open PSII centers（F_v′ F_m′）,photochemical quenching coefficient（q_p）,actual PSII efficiency（Φ_（PSII））,non-photochemical quenching coefficient（q_N）,POD activity,malondialdehyde（MDA） content and superoxide anion（O_2- ·）producing rate had no obvious changes.Under 10 and 15 mmol/L Zn（2＋） stress,the above growth indexes,chlorophyll contents,photosynthetic indexes（except C_i and q_N changed complexly） significantly decreased,the antioxidant enzymes activies,MDA content and O_2- · producing rate obviously increased,and the higher the Zn（2＋） concentration,the greater the change.