Negative Effects of Oxytetracycline on Wheat (Triticum aestivum L.) Growth, Root Activity, Photosynthesis, and Chlorophyll Contents

Agricultural Sciences in China Pub Date : 2011-10-01 Epub Date: 2011-10-21 DOI:10.1016/S1671-2927(11)60150-8

LI Zhao-jun, XIE Xiao-yu, ZHANG Shu-qing, LIANG Yong-chao

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引用次数: 45

Abstract

A solution culture experiment was performed to investigate the effects of oxytetracycline (OTC) on wheat (Triticum aestivum L.) growth, chlorophyll contents, and photosynthesis at five levels of 0, 10, 20, 40, and 80 mmol L-¹ OTC. OTC is toxic to wheat. The wheat growth, especially wheat root was significantly decreased. Further OTC also significantly decreased root activity, chlorophyll contents, and photosynthetic parameters except for intercellular C0₂ concentrations. The different responses of indicators such as root number, root activity and so on to OTC were also observed. The IC₅₀ values for the tested indicators to OTC ranged from 7.1 to 113.4 mmol L-¹ OTC. The order of indicator sensitivity to OTC was root number > stomatal conductance > chlorophyll a > total chlorophyll >photosynthetic rates > total surface area > transpiration rate >chlorophyll b>fresh weight of root>dry weight of root>total length>dry weight of shoot = fresh weight of shoot>total volume. The root number was more sensitive than other indicators with the IC₅₀ value of 7.1 mmol L-¹ OTC, and could be taken as the sensitive indicator to predict the hazards of OTC to wheat.

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土霉素对小麦的负面影响生长、根系活性、光合作用和叶绿素含量

摘要通过溶液培养试验，研究了0、10、20、40和80 mmol L-1剂量土霉素(OTC)对小麦(Triticum aestivum L.)生长和叶绿素含量的影响。OTC对小麦有毒。小麦的生长，尤其是根系显著下降。此外，除细胞间co2浓度外，OTC还显著降低了根系活性、叶绿素含量和光合参数。同时还观察了根系数量、根系活性等指标对OTC的不同响应。检测指标对OTC的IC50值范围为7.1 ~ 113.4 mmol L-1 OTC。各指标对OTC的敏感性依次为根数>气孔导度>叶绿素a >叶绿素总光合速率>总表面积>蒸腾速率>叶绿素>根系鲜重>根系干重>总长度>茎干重=茎鲜重>总体积。根数的IC50值为7.1 mmol L-1 OTC，比其他指标更敏感，可作为预测OTC对小麦危害的敏感指标。

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Agricultural Sciences in China AGRICULTURE, MULTIDISCIPLINARY-

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3.2 months