土霉素对小麦毒性效应的品种间差异

为了研究土霉素对小麦毒性效应的品种间差异,收集了63个小麦品种,根据土霉素对小麦种根影响的试验结果,从中筛选出对土霉素耐性相差最大的两个小麦品种,探讨了土霉素对这两个小麦品种叶片叶绿素含量的影响.结果表明:1)小麦对土霉素的耐性存在品种间差异,在供试的63个小麦品种中,核优1号对土霉素最敏感,而烟农21对土霉素最不敏感,二者的EC50值分别为1.25和54.21mg·L-1;2)土霉素处理能够显著降低小麦叶片叶绿素a、叶绿素b以及总叶绿素的含量,其中对土霉素敏感品种核优1号的抑制显著高于不敏感品种烟农21;3)就同一品种而言,土霉素胁迫条件下,叶片叶绿素a的降低程度明显高于叶绿素b,叶片叶绿素a/b的比值显著降低.土霉素对敏感品种核优1号叶绿素a/b比值的影响显著弱于不敏感品种烟农21.

Cultivar Differences in Toxic Effects of Oxytetracycline on Wheat (Triticum durum)

Hydroponic experiments were performed to study the genotypic differences in toxic effects of oxytetracycline, a kind of tetracycline, on the root of wheat(Triticum durum). Results were presented as follows: 1)The significant genotypic differences in responses of wheat to oxytetracycline were found. Among 63 wheat cultivars tested, cultivar Heyou 1 was the most sensitive to oxytetracycline with the EC50 value of 1.25mg·L-1, and cultivar Yannong 21 was most insensitive to oxytetracycline with the EC50 value of 54.21mg·L -1. 2)Contents of chlorophyll a, chlorophyll b and total chlorophyll in leaves of the two wheat cultivars tested decreased with the increase of oxytetracycline concentrations. The negative effects of oxytetracycline on the contents of chlorophyll a, chlorophyll b and total chlorophyll were more significant in the sensitive cultivar Heyou 1 than in the insensitive cultivar Yannong 21. 3)In the two wheat cultivars tested, oxytetracycline exhibited more inhibitory effects on chlorophyll a than on chlorophyll b. Oxytetracycline could also decrease the ratio of chlorophyll a to chlorophyll b and such effects of oxytetracycline on the sensitive cultivar were less than on the insensitive cultivar.