CO2／盐冲击对小麦幼苗呼吸酶活性的影响

以不同抗盐小麦 (Triticum aestivum L.)为材料 ,研究了 CO2 /盐冲击对幼苗生长状况、叶绿素含量、光呼吸和三羧酸循环 (TCAC)关键酶活性的影响。结果表明 :Na Cl抑制小麦生长 ,而 CO2 促进生长 ,这种效应盐处理植株比非盐处理植株明显 ;Na Cl降低叶绿素含量 ,CO2 可使其轻微提高 ;盐对普通小麦TCAC中的异柠檬酸脱氢酶 (IDH)、琥珀酸脱氢酶 (SDH)、苹果酸脱氢酶 (MDH)和光呼吸中的乙醇酸氧化酶 (GO)、羟基丙酮酸还原酶 (HPR)有刺激作用 ,CO2 则抑制它们的活性。抗盐小麦对 CO2 /盐冲击的反应与普通小麦有差别。结果可以说明 ,CO2 能够减轻 Na Cl对植物的毒害效应

INFLUENCES OF CO_2 /SALT SHOCK ON RESPIRATORY ENZYME ACTIVITIES IN WHEAT SEEDLING WITH DIFFERENT SALT TOLERANCE

Influences of CO 2/salt shock on the growth status,chlorophyll contents and activities of enzymes including tricarboxylic acid cycle (isocitric dehydrogenase (IDH),malic dehydrogenase (MDH),succinic dehydrogenase (SDH)) and photorespiratory pathway (glycolate oxidase (GO),hydroxypyruvate reductase (HRR),catalase) in seedling of wheat with different salt tolerance have been studied.Results showed that the growth of two wheat varieties were inhibited by NaCl and stimulated by CO 2,the responses being greater in the salt stressed than in the non salt stressed plants.The chlorophyll contents at two wheat varieties were decreased by NaCl while chorophyll levels were elevated by CO 2.The activities of SDH,IDH,MDH in TCAC,and GO,HPR in photorespiratory pathway were stimulated by NaCl in salt sensitive wheat,whereas these enzymes activities were inhibited by CO 2,their response being different in salt tolerant wheat.Data suggested that increased CO 2 levels might alleviate the adverse effects of salinity.