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Colonization with arbuscular mycorrhizal fungus affects growth, drought tolerance and expression of stress-responsive genes in Poncirus trifoliata

100%

Fan Q., Liu J. H.

Acta Physiologiae Plantarum

2011

tom 33

nr 4

The objective of this study was to investigate the effects of arbuscular mycorrhizal fungus (AMF) inoculation on growth and drought tolerance of Poncirus trifoliata seedlings. The seedlings were inoculated with or without Glomus mosseae before exposure to a short-term (3 days) water depletion, and relevant physiological and biochemical parameters (plant height, chlorophyll content, relative water content, activity of antioxidant enzymes) and expression patterns of several stress-responsive genes were examined. Inoculation with G. mosseae led to growth promotion of the seedlings, as revealed by larger plant height and higher relative water and chlorophyll contents. When subjected to drought treatment, the AMF-inoculated (AM) plants showed better tolerance than the nonmycorrhizal (NAM) plants. Under drought, the AM plants exhibited higher level of proline and activity of two antioxidant enzymes, superoxide dismutase (SOD) and peroxidase (POD). In addition, mRNA abundance of four genes involved in reactive oxygen species homeostasis and oxidative stress battling was higher in the AM plants when compared with the NAM plants. These results indicate that AMF inoculation stimulated growth and enhanced drought tolerance of the seedlings, which may be due to activation of an arsenal of physiological, biochemical and molecular alterations.

The chemical composition and ruminal degradation of the protein and fibre of tetraploid Robinia pseudoacacia harvested at different growth stages

61%

Zhang G. J., Li Y., Xu Z. H., Jiang J. Z., Han F. B., Liu J. H.

Journal of Animal and Feed Sciences

2012

tom 21

nr 1

Samples of leaves, stems and whole plant of tetraploid Robinia pseudoacacia harvested at four different growth stages (first rapid growth, slow growth, second rapid growth, and leaf-colour changing) were analysed for chemical composition and in situ disappearance of protein and fibre using the nylon bag technique. The crude protein content was the highest in leaves, followed by whole plant, and the lowest in stems, while the opposite trend was found for dry matter, NDF, and ADF. Moreover, the crude protein content of the three plant parts decreased during maturation. Effective degradability of crude protein was higher for stems (519.0 g kg-1) than for whole plant (353.6 g kg-1) and leaves (270.4 g kg-1). Effective degradability of ADF was significantly higher in leaves than in the whole plant and stems. Ruminal disappearance of nutrients in the three plant parts was higher during the first rapid growth stage than at later stages.

Effect of the gynosaponin on methane production and microbe numbers in a fungus-methanogen co-culture

61%

Wang X. F., Mao S. Y., Liu J. H., Zhang L. L., Cheng Y. F., Jin W., Zhu W.-Y.

Journal of Animal and Feed Sciences

2011

tom 20

nr 2

This study investigated the effect of saponins gypenoside (gynosaponins) on methane production and microbe numbers in a co-culture of a fungus, Piromyces sp. F1, and a methanogen, Methanobrevibacter sp.. Two co-culture systems were used: with methanogen (co-culture I) and without methanogen (co-culture II; methanogen growth inhibited by chloramphenicol). Each co-culture system was treated with 0, 50, 100 or 200 mg gynosaponins/l culture medium. Gas production, methane concentration and volatile fatty acid concentration (VFA) were measured for each treatment group. The numbers of anaerobic fungi and methanogen were quantified by real time PCR. The results showed that, compared with the control, gynosaponin significantly reduced the gas production, methane concentration, methane to TVFA ratio (total volatile fatty acid), TVFA concentration, number of fungi (except for 50 mg dose of gynosaponin in co-culture I) and number of methanogens. Methane was not detected in co-culture II. The individual VFAs proportion of TVFA were not affected by gynosaponins in either of the co-cultures. The pH was higher in both co-cultures than that of the control (P<0.01). These data suggest that gynosaponins has the potential for being used as feed additive to modulate the ruminal fermentation, inhibit the methanogen growth and reduce methane production.

Ograniczanie wyników

2 Journal of Animal and Feed Sciences

1 Acta Physiologiae Plantarum

3 Liu J. H.

1 Cheng Y. F.

1 Fan Q.

1 Han F. B.

1 Jiang J. Z.

1 Jin W.

1 Li Y.

1 Mao S. Y.

1 Wang X. F.

1 Xu Z. H.

1 Zhang G. J.

1 Zhang L. L.

1 Zhu W.-Y.

1 2012

2 2011

Wyniki wyszukiwania

Colonization with arbuscular mycorrhizal fungus affects growth, drought tolerance and expression of stress-responsive genes in Poncirus trifoliata

The chemical composition and ruminal degradation of the protein and fibre of tetraploid Robinia pseudoacacia harvested at different growth stages

Effect of the gynosaponin on methane production and microbe numbers in a fungus-methanogen co-culture