NO (3) (-) is a major nitrogen source for plant nutrition, and plant cells store NO (3) (-) in their vacuoles. Here, we report that a unique compost made from marine animal resources by thermophiles represses NO (3) (-) accumulation in plants. A decrease in the leaf NO (3) (-) content occurred in parallel with a decrease in the soil NO (3) (-) level, and the degree of the soil NO (3) (-) decrease was proportional to the compost concentration in the soil. The compost-induced reduction of the soil NO (3) (-) level was blocked by incubation with chloramphenicol, indicating that the soil NO (3) (-) was reduced by chloramphenicol-sensitive microbes. The compost-induced denitrification activity was assessed by the acetylene block method. To eliminate denitrification by the soil bacterial habitants, soil was sterilized with gamma irradiation and then compost was amended. After the 24-h incubation, the N2O level in the compost soil with presence of acetylene was approximately fourfold higher than that in the compost soil with absence of acetylene. These results indicate that the low NO (3) (-) levels that are often found in the leaves of organic vegetables can be explained by compost-mediated denitrification in the soil.
机构:
Univ Nevada, Sch Life Sci, Las Vegas, NV 89154 USAUniv Nevada, Sch Life Sci, Las Vegas, NV 89154 USA
Dodsworth, Jeremy A.
;
Hungate, Bruce A.
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No Arizona Univ, Dept Biol Sci, Flagstaff, AZ 86011 USA
No Arizona Univ, Merriam Powell Ctr Environm Res, Flagstaff, AZ 86011 USAUniv Nevada, Sch Life Sci, Las Vegas, NV 89154 USA
Hungate, Bruce A.
;
Hedlund, Brian P.
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h-index: 0
机构:
Univ Nevada, Sch Life Sci, Las Vegas, NV 89154 USAUniv Nevada, Sch Life Sci, Las Vegas, NV 89154 USA
机构:
Univ Nevada, Sch Life Sci, Las Vegas, NV 89154 USAUniv Nevada, Sch Life Sci, Las Vegas, NV 89154 USA
Dodsworth, Jeremy A.
;
Hungate, Bruce A.
论文数: 0引用数: 0
h-index: 0
机构:
No Arizona Univ, Dept Biol Sci, Flagstaff, AZ 86011 USA
No Arizona Univ, Merriam Powell Ctr Environm Res, Flagstaff, AZ 86011 USAUniv Nevada, Sch Life Sci, Las Vegas, NV 89154 USA
Hungate, Bruce A.
;
Hedlund, Brian P.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Nevada, Sch Life Sci, Las Vegas, NV 89154 USAUniv Nevada, Sch Life Sci, Las Vegas, NV 89154 USA