Lianju Ma

Shenyang Normal University, Feng-t’ien, Liaoning, China

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Publications (6)13.74 Total impact

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    ABSTRACT: An endophytic fungus was tested in rice (Oryza sativa L.) exposed to four levels of lead (Pb) stress (0, 50, 100 and 200 μM) to assess effects on plant growth, photosynthesis and antioxidant enzyme activity. Under Pb stress conditions, endophyte-infected seedlings had greater shoot length but lower root length compared to non-infected controls, and endophyte-infected seedlings had greater dry weight in the 50 and 100 μM Pb treatments. Under Pb stress conditions, chlorophyll and carotenoid levels were significantly higher in the endophyte-infected seedlings. Net photosynthetic rate, transpiration rate and water use efficiency were significantly higher in endophyte-infected seedlings in the 50 and 100 μM Pb treatments. In addition, chlorophyll fluorescence parameters Fv/Fm and Fv/Fo were higher in the infected seedlings compared to the non-infected seedlings under Pb stress. Malondialdehyde accumulation was induced by Pb stress, and it was present in higher concentration in non-infected seedlings under higher concentrations of Pb (100 and 200 μM). Antioxidant activity was either higher or unchanged in the infected seedlings due to responses to the different Pb concentrations. These results suggest that the endophytic fungus improved rice growth under moderate Pb levels by enhancing photosynthesis and antioxidant activity relative to non-infected rice.
    Journal of hazardous materials 01/2012; 213-214:55-61. · 4.14 Impact Factor
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    ABSTRACT: Endophyte infected and uninfected seedlings of rice (Oryza sativa L.) were subjected to five different levels of Na(2)CO(3) for 2 weeks. Under both Na(2)CO(3) stress as well as no stress, endophyte-infected plants were higher for above-ground dry weight and shoot length, but lower for root length compared to non-infected controls, and there was no significant difference for below-ground dry weight. Chlorophylls and carotenoid contents, net photosynetic rate, transpiration rate, catalase and peroxidase activities increased, but malondialdehyde content declined in the infected plants compared to non-infected controls under Na(2)CO(3) stress. Compared to non-infected controls, water use efficiency, stomatal conductance, chlorophyll fluorescence parameters (F(v)/F(m), F(v)/F(o)) and superoxide dismutase activity in infected plants increased under high concentrations of Na(2)CO(3) while there was no significant difference under low concentrations of Na(2)CO(3). Endophyte infection was concluded to be beneficial to the growth and antioxidative mechanisms in Oryza sativa under Na(2)CO(3) stress.
    Ecotoxicology and Environmental Safety 12/2011; 78:35-40. · 2.20 Impact Factor
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    ABSTRACT: Hydroponic experiments were carried out to study the role of oligochitosan in enhancing wheat (Triticum aestivum L.) resistance to salt stress. Data were collected on plant biomass, chlorophyll content, photosynthetic rate (P (n)), stomatal conductance (g (s)), proline content, antioxidant enzyme activities, and malondialdehyde (MDA) content. Under 150 mM salt stress, plant growth was significantly inhibited. Shoot length, root length, and dry weight were sharply reduced by 26%, 31%, and 20%, respectively, of the control. Superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) were increased by 28%, 13%, and 26%, respectively, of the control and MDA content largely accumulated, which was 1.5-fold of the control. However, 0.0625% oligochitosan pretreatment alleviated the adverse effects of salt stress, which was reflected by increasing root length, shoot length, dry weight, chlorophyll content, P (n,) and g (s). Furthermore, it also showed that oligochitosan pretreatment significantly increased antioxidant enzyme (SOD, CAT and POD) activities, and reduced MDA content in leaves. Meanwhile, the accumulation of proline was markedly accelerated. The results indicated that oligochitosan pretreatment ameliorated the adverse effects and partially protected the seedlings from salt stress during the following growth period.
    Protoplasma 05/2011; 249(2):393-9. · 2.86 Impact Factor
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    ABSTRACT: Four-year-old Gingko (Ginkgo biloba L.) trees were exposed to ambient and elevated concentrations of CO2 and O3, and their combination for 1year, using open-top chambers in Shenyang, China in 2006. Growth parameters and endogenous plant hormones were measured simultaneously over the experiment period. Elevated CO2 increased leaf area and leaf dry weight but had no effect on shoot length, increased indole-3-acetic acid (IAA), gibberellins A3 (GA3), zeatin riboside (ZR), dihydrozeatin (DHZR) and isopentenyl-adenosine (iPA) content but decreased abscisic acid (ABA) content. Elevated O3 significantly decreased leaf area, leaf dry weight, shoot length, and decreased IAA, GA3, ZR content but increased ABA content and had a little effect on iPA, DHZR content. Elevated CO2+O3 decreased IAA, iPA and DHZR content while increased ABA and GA3 content in the early stage of the exposure and then decreased in the late stage. The evidence from this study indicates that elevated CO2 ameliorated the effects of elevated ozone on tree growth, and elevated CO2 may have a largely positive impact on forest tree growth while elevated O3 will likely have a negative impact. KeywordsElevated CO2 and O3 –ELISA–Endogenous plant hormones– Ginkgo biloba –Growth parameter
    Acta Physiologiae Plantarum 01/2011; 33(1):129-136. · 1.31 Impact Factor
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    ABSTRACT: Aims The objective of this research was to study the effects of ultraviolet-B (UV-B) radiation and cadmium (Cd), applied individually, in combination, and alternately in soybean (Glycine max L) seedlings. Methods Pigment content, photosynthetic parameters, chlorophyll fluorescence and antioxidant enzymes (i.e., catalase (CAT), superoxide dismutase (SOD), guaiacol peroxidase (POD)), and malondialdehyde (MDA) content were investigated. Observations began 6 days after the exposure to Cd (40 mgkg−1), UV (7.1 kJ m−2) and Cd+UV, as well as 3 days after the exposure to Cd/(or) UV followed by exposure to Cd+UV (i.e., Cd∼Cd+UV, UV∼Cd+UV). Results After 6 days of treatment, all treatments showed lower shoot dry weight relative to controls, except Cd∼Cd+UV. Cd and Cd+UV significantly (P < 0.05) decreased root length and root dry weight. UV-B and Cd alone significantly (P < 0.05) reduced pigment content, net photosynthetic rate, stomatal conduction, transpiration and SOD activity, and significantly (P < 0.05) increased MDA content. Cd also significantly (P < 0.05) reduced chlorophyll fluorescence but increased H2O2 contents. Compared to individual treatments, the combined effect was more detrimental to the above parameters. The sequential treatments (Cd∼Cd+UV or UV∼Cd+UV) were no or less detrimental compared to the combined treatments. Conclusions This is the first report of the sequentially applying UV-B and Cd stress. Reduced detrimental effects by the sequential application compared to the combination suggested the cross-adaptation of Cd and UV-B mediated protection of Cd+UV in soybean.
    Plant and Soil 352(1-2). · 3.24 Impact Factor
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    Xuemei Li, Lihong Zhang, Lianju Ma
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    ABSTRACT: Rice seedlings (Oryza sativa L.) were grown in a controlled environment and divided into control seedlings (CK1: 80% field capacity was always held), preconditioned seedlings (PT, 6 days mild drought for preconditioning–3 days re-watering–intermediate drought stress) and non-preconditioned seedlings (CK2, 9 days 80% field capacity and immediately followed by intermediate drought). Photosynthetic CO2 exchange, photosynthetic pigment content were measured in CK1 and PT after preconditioning and re-watering as well as CK1, PT and CK2 after intermediate drought. After exposure to 6 days mild drought preconditioning, stomatal conductance (gs), transpiration rate (E) and chlorophyll content were lower, while Car content and Car/Chl ratio were higher in PT than those in CK1. PT had no significant differences in net photosynthetic rate (Pn) compared to CK1. After re-watering, Chla content was higher but Car/Chl ratio was lower in PT than those in CK1, and other parameters of PT were similar to CK1. After exposure to intermediate drought stress for 6 days, PT showed high water use efficiency (WUE) after intermediate drought stress. CK2 suffered more serious injuries than PT as indicated by lower Pn and pigment content, suggesting that the differences in response to intermediate drought stress in CK2 and PT seedlings are closely related to the effect of mild drought preconditioning. It may be concluded that preconditioning made rice seedlings modulate their metabolism such that they could acclimatize more successfully to the fluctuating water stress environment.
    Procedia Environmental Sciences. 11:1339–1345.