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中文摘要：
采用砂培法在人工气候箱控制条件下，研究了碱胁迫（0、15．0、30．0、45．0、60．0mmol／LNa2CO3）对2种甜瓜（鹤丰7号和超级五龙白）幼苗生长及光合色素含量和抗氧化作用的影响。结果表明，2种甜瓜耐碱的极限浓度为60．0mmoL／L。低浓度（15．0mmol／L）碱胁迫，甜瓜幼苗地上、地下部分干、鲜重和根冠比（鲜）增加，幼苗生长状况良好。随培养液中碱浓度的升高，甜瓜幼苗叶绿体色素含量及上述各项指标逐渐下降，抗氧化酶活性呈先升后降的趋势。超级五龙白随碱胁迫加剧，POD活性升幅较缓而CAT活性降幅较大；鹤丰7号Chla、car含量和保护酶系统的稳定性高于超级五龙白，具较强的碱耐受性。
英文摘要：
The effects of alkaline stress （0,15.0,30.0,45.0 and 60.0 mmol/L Na2 CO3 ） on the growths photosynthesis pigment and anti-oxidation of the seedling of two muskmelon varieties, hefeng No. 7 and wulongbai, were studied by sand culture in artificial climate two varieties to be able to tolerate alkaline stress （ 15.0 mmol/L）, alkaline stress ,the muskmelon box. The results showed that the ceiling concentration for the was 60.0 mmol/L. Under the conditions of low concentration seedling growed normal, melon seedlings dry and fresh weight of ground and underground and root shoot ratio （fresh） increased. With the increase of alkali concentration in the medium, melon chlorophyll content and the above indicators decreased, antioxidant enzyme activity first increased and then decreased. POD activity of super wulongbai had a moderate increase while CAT activity had a lager decline. Chla, car content and stability of the protective enzyme system of hefeng No. 7 had stronger alkali tolerance than that of wulongbai.
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