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采用镧溶液处理耐镧品种周8425B和镧敏感品种皖麦41幼苗,测定了叶片和根系的总巯基、蛋白巯基、非蛋白巯基含量以及可溶性蛋白含量。结果表明,耐性品种是通过根系合成较多的非蛋白巯基络合镧,减少镧向地上部的运输,而提高植株对镧耐性。而敏感品种根系蛋白巯基受镧胁迫后含量下降,会有更多量的镧吸收运输到地上部分,因此叶片的蛋白巯基增多,高浓度镧的胁迫作用在根部会更为突出,表现出对镧的耐受程度下降。
The lanthanum-tolerant varieties Zhou 8425B and lanthanum-sensitive Wanmai 41 seedlings were treated with lanthanum. Total thiols, sulfhydryl groups, non-sulfhydryl groups and soluble protein contents of leaves and roots were measured. The results showed that tolerant cultivars could improve lanthanum tolerance of plants by synthesizing more non-protein sulfhydryl complex lanthanum in the root system and reducing the transport of lanthanum to shoots. However, the content of thiol in root of sensitive cultivars decreased after lanthanum treatment, and more amount of lanthanum was absorbed and transported to above-ground parts. Therefore, the protein thiol groups of leaves increased and the stress of high-concentration lanthanum was more prominent in roots. The degree of tolerance decreased.