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The effects of molybdenum and boron on the rhizosphere microorganisms and soil enzyme activities of soybean

100%

Sun T., Wang Y. P., Wang Z. Y., Liu P., Xu G. D.

Acta Physiologiae Plantarum

2013

tom 35

nr 03

This study examined the effects of molybdenum (Mo) and boron (B) on the rhizosphere microorganisms and the soil enzyme activities of soybean. The soybeans were treated with seven different Mo and B supplements (control: without Mo and B) Mo1 (0.0185 g kg-1), B1 (0.08 g kg-1), Mo1 + B1 (0.0185 ? 0.08 g kg-1), Mo2 (0.185 g kg-1), B2 (0.3 g kg-1) and Mo2 ? B2 (0.185 + 0.3 g kg-1) throughout the plants’ four growth stages. The results showed that Mo, B, and combined Mo and B treatments increased the soil microbial populations, stimulated the rhizosphere metabolisms, and improved the soil enzyme activities. These stimulatory effects varied in intensity among the treatment groups. The Mo and B combination treatments were more beneficial for the soybean rhizosphere soil than that of Mo-only or the B-only treatments, which suggests that the two elements have complementary functions in the biological processes of the soybean rhizosphere.

Morphological and physiological responses of root tip cells to Fe2 plus toxicity in rice

86%

Zhang Y., Zheng G. H., Liu P., Song J. M., Xu G. D., Cai M. Z.

Acta Physiologiae Plantarum

2011

tom 33

nr 3

Two genotypes of rice (Oryza sativa L.), Azucena (iron tolerant) and IR64 (iron sensitive), were used to investigate the numbers and survival rates of root border cells (namely, in situ border cells) in plants that were exposed to excess iron (Fe²⁺). Additionally, we examined the changes in the root tip cell morphology and activities of protective enzymes in response to Fe²⁺ toxicity. The results showed that Fe²⁺ toxicity hindered the development of root border cells (RBCs) and that higher Fe²⁺ concentrations caused root cap cell walls to thicken. In the iron-sensitive rice variety, these changes lowered RBC survival rate and lead to programmed cell death. Low concentrations of Fe²⁺ were shown to facilitate the development of RBCs in the iron-tolerant rice variety and that the activities of the protective enzymes superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were elevated in the iron-tolerant variety, thus suggesting that rice root tips could defend against Fe²⁺ toxicity by producing RBCs, root cap cells, and protective enzymes.

Ograniczanie wyników

2 Acta Physiologiae Plantarum

2 Liu P.

2 Xu G. D.

1 Cai M. Z.

1 Song J. M.

1 Sun T.

1 Wang Y. P.

1 Wang Z. Y.

1 Zhang Y.

1 Zheng G. H.

1 2013

1 2011

Wyniki wyszukiwania

The effects of molybdenum and boron on the rhizosphere microorganisms and soil enzyme activities of soybean

Morphological and physiological responses of root tip cells to Fe2 plus toxicity in rice