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在人工控水条件下,于叶丛生长期设置0~40 cm土层含水量为70%田间持水量、50%田间持水量和30%田间持水量3个处理,研究干旱胁迫下甜菜叶片相关生理性状的变化.结果表明:甜菜叶丛生长期中度缺水处理(50%田间持水量)的补偿指数最大,甜菜叶片丙二醛(MDA)含量、相对电导率、过氧化氢酶(CAT)活性及可溶性糖含量均在复水后24 h产生补偿效应,脯氨酸产生的补偿效应在复水后48 h,过氧化物酶(POD)未发生补偿效应.酶促活性氧清除系统以CAT反应最为灵敏.因此,在甜菜叶丛快速生长期,当土壤含水量下降至田间持水量的50%时应及时进行补充灌溉,促使叶片产生补偿效应,从而降低干旱胁迫对甜菜产量和含糖量的影响.
Under the conditions of artificial water control, three treatments of 0-40 cm soil water content of 0-40 cm soil layer in the field were set up in field with 70% field capacity, 50% field capacity and 30% field capacity. The results showed that the compensatory index of moderate water deficit treatment (50% field water content) in the growing stage of beet was the highest, and the content of malondialdehyde (MDA), relative conductivity and catalase (CAT) And soluble sugar content all compensated for 24 h after rewatering.The compensation effect of proline production did not compensate for peroxidase (POD) at 48 h after rewatering.Enzyme activity scavenging system was catalyzed by CAT reaction The most sensitive.Therefore, in the rapid growing period of beet leaf, when the soil water content dropped to 50% of the field water, irrigation should be promptly prompt and promote leaf compensation effect, thus reducing the drought stress on sugar beet yield and sugar content influences.