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Sun X.,Huazhong Agricultural University | Sun X.,Key Laboratory of Subtropical Agriculture and Environment | Hu C.,Huazhong Agricultural University | Hu C.,Key Laboratory of Subtropical Agriculture and Environment | And 3 more authors.
Journal of Food, Agriculture and Environment | Year: 2010

Molybdenum (Mo) is an essential element for higher plants. It has been shown that application of Mo enhances the cold resistance of winter wheat. In order to improve our understanding of the mechanisms of enhanced cold resistance arising from Mo application in winter wheat, we investigate the effects of molybdenum on endogenous hormone in roots of winter wheat (Mo efficient cv. 97003 and Mo inefficient cv. 97014) under low temperature stress. The results showed that Mo application increased the aldehyde oxidase (AO) activities, the contents of abscisic acid (ABA) and indole-3-acetic acid (IAA) in winter wheat roots during 6 days of low temperature stress. However, no significant difference in the contents of gibberellin (GA3) and zeatin (ZT) was observed between -Mo and +Mo treatments at 0 and 2 d of low temperature stress, whereas the contents of GA3 decreased and ZT increased significantly in +Mo treatments until 4 days of low temperature stress. These results indicated that the response of ABA and IAA to Mo deficiency was prior to that of GA3 and ZT under low temperature stress. The greater effect of Mo on the ABA and IAA may be due to the fact that Mo can directly regulate ABA and IAA biosynthesis through AO. Mo-deficiency induced the drastic decrease of the ABA/GA3 in winter wheat under low temperature stress. Similarities and differences between the Mo-efficient and Mo-inefficient wheat cultivars in response to Mo under cold stress are also discussed.

Dai K.,Key Laboratory of Subtropical Agriculture and Environment | Dai K.,Huazhong Agricultural University | Chen H.,Huazhong Agricultural University | Li X.,Huazhong Agricultural University | And 2 more authors.
Advanced Materials Research | Year: 2011

The MWNT-TiO2 nanocomposite was synthesized via direct growth of TiO2 nanoparticles on the surface of the functionalized MWNTs by the hydrothermal treatment and utilized as the photocatalyst in the carbaryl degradation under both visible light and UV light irradiation. Visible-light-driven activity and enhanced UV-light-driven activity are both achieved as the composite MWNTs with TiO2 can efficiently enhance the light absorption and charge separation and then photocatalytic activity. The photodegradation efficiency of carbaryl was examined by HPLC and IC techniques, which demonstrates that carbaryl can be readily degraded under visible light irradiation. Based on the obtained experimental results, assisted with the computer simulation of carbaryl molecule on PM3 level, it is presumed that the degradation of carbaryl starts with the break of N21-C23 and C19-N21 bonds and ends in the generation of naphthalen-1-ol before the ring-opening reaction. © (2011) Trans Tech Publications, Switzerland.

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