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Zhao B.,South China Agricultural University | Zhao B.,Key Laboratory of Ecological Agriculture of Ministry of Agriculture | Zhao B.,Rural Environment of Guangdong Regular Higher Education Institutions | Zhang J.,South China Agricultural University | And 5 more authors.
Plant, Soil and Environment | Year: 2013

This study aimed to know whether the methane oxidation of rice roots was enhanced when rice shoots was stimulated. Stimulus was applied using a mechanical device which continuously touched the rice shoots with strength of 5, 30 and 60 min/day. In 5 min/day and 30 min/day stimuli treatments, methane oxidation rates of rice roots at 6 h were both significantly improved. Rice height was decreased significantly in 30 min/day stimuli treatment. Root biomass and root activities were significantly improved in 5 min/day and 30 min/day stimuli treatments. Length, surface area and volume of rice roots in 30 min/day stimuli treatment were improved significantly. Stomata areas were found to be significantly higher in 30 min/day and 60 min/day stimuli treatments. Continuous stimuli of 5 min/day and 30 min/day on rice shoots led to methane oxidation capacity enhancement of rice roots and response of rice at the physiological and morphological level. This study ascertained the importance of biological activity in paddy fields on the methane release process.


Zeng Q.-Y.,South China Agricultural University | Zeng Q.-Y.,Key Laboratory of Ecological Agriculture of Ministry of Agriculture | Mo C.-H.,Jinan University | Wen R.-L.,South China Agricultural University | And 3 more authors.
Huanjing Kexue/Environmental Science | Year: 2010

Two genotypes of Brassica parachinensis, DEHP high-accumulation of Youqing-60 and low-accumulation of Teqing-60, were grown in hydroponic systems contaminated with DEHP (20 and 50 mg·L-1). Anatomy of roots was measured, and their effects on uptake of DEHP in roots and shoots were discussed. The results showed that roots anatomy of two genotypes of Brassica parachinensis and their responds to DEHP pollution were significantly different. DEHP contents in roots and shoots of Youqing-60 were mainly affected by the thickness of cambium in taproot and the diameter of vascular bundle, the coefficients on DEHP of roots and shoots were 0.900 and 0.809, respectively. DEHP contents of Teqing-60 were mainly affected by the thickness of cambium in taproot and cortex in fibre root in roots, which the coefficient was 0.757, and were mainly affected by the thickness of cambium in taproot in shoots, which the coefficient was 0.856. The wood ray cells in roots of Youqing-60 were rectangular shape and arranged orderly. The thickness of cork layer in taproot and cortex in fibre root of Youqing-60 were lower and the quantity of trachea and diameter of vascular bundle and trachea in fibre root of Yonqing-60 were higher than that of Teqing-60, which indicated that DEHP in soil solution and adsorbed on root were easier penetrated into xylem and transported in Youqing-60 than in Teqing-60.

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