Title |
Transformation of Inorganic P Fractions of Soil and Plant Growth Promotion by Phosphate-solubilizing Ability of Penicillium oxalicum I1 |
Author |
Mingbo Gong1, Peng Du2, Xue Liu3, and Changxiong Zhu3* |
Address |
1The Key Laboratory of Microbial Resources, Ministry of Agriculture / Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 10081, P. R. China, 2Environmental Development Centre of Chinese Ministry of Environmental Protection, Beijing, 10029, P. R. China, 3Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 10081, P. R. China |
Bibliography |
Journal of Microbiology, 52(12),1012-1019, 2014,
|
DOI |
10.1007/s12275-014-4406-4
|
Key Words |
Penicillium oxalicum, inorganic P fractions, transformation,
phosphate solubilizing, plant growth promotion |
Abstract |
The solubilization of tricalcium phosphate is often considered
as the standard for screening of most phosphate-solubilizing
microorganisms (PSMs). However, usually the effect
of large-scale application of PSM on the promotion of crop
growth varies. This study presents an efficient method for
screening and testing phosphate-solubilizing fungus that
enhance plant growth. A fungus Penicillium oxalicum I1 (PI1)
was isolated and identified that had high ability of phosphate-
solubilization and could utilize maize root exudates as
sources, and propagate well in vitro and in soil. P-I1 excreted
oxalic acid and reached 593.9 μg/ml, and the pH value was
decreased from 6.90 to 1.65 in 26 h. The amount of P-I1 increased
by 48-fold in 28 d and was maintained for 49 d in
soil. PSM showed selectivity on the transformation of the
different forms of phosphorus, a wide range of insoluble
phosphates, such as Ca8H2(PO4)6·5H2O, AlPO4, FePO4, and
Ca10(PO4)6(OH)2, were converted to soluble CaHPO4 in soil,
and CaHPO4 was also inhibited from being converted into
insoluble phosphate by P-I1. The Ca2-P content reached 27.11
μg/g soil on day 28 at 20°C, which increased by 110.32%,
and plant growth promotion was tested and verified, the
results showed that maize yield increased remarkably than
control after inoculated P-I1, maize yield increased maximum
by 14.47%. The data presented that P-I1 appear attractive
for exploring their plant growth-promoting activity
and potential field application. |