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- Title
Manganese stress impairs stem ureide nitrogen fixation in yardlong-bean plants in the acidic environment.
- Authors
Hong Li
- Abstract
Manganese (Mn), an essential micronutrient for plant growth, involves in plant photosynthetic and metabolic processes. Yet soil Mn stress, organic-C and rhizobial inoculant interactions on legume symbiotic N fixation are not well understood. Our objectives were to examine crop tolerance to Mn stress and to determine the relationships between Mn uptake, root nodulation, stem ureide, amino- N and nitrate holding in yardlong-beans (Vigna unguiculata subsp. sesquipedalis), one of the major tropical fresh vegetables. The field studies were conducted in Hainan, southern China during 2012- 2014. The experimental treatments consisted of three levels of organic C (OC, 0, 4 and 8 Mg/ha estimated from chicken compost) and four levels of rhizobial inoculants (RI, 0, 6, 12 and 18 g/kg), arranged in a split-plot design with 4 replicates. The results showed that yardlong-bean plants responded strongly to both OC and RI treatments in all measured physiological and nutritional aspects (P < 0.05). Leaf Mn holding varied between 496 ± 89 µg/g. Plant Mn in excess (>360 µg/g) could induce plant stress to impair leaf chlorophyll, stomatal conductance, carbonxylation, stem allantoin, amino acids, nitrate concentrations and plant N derived from N fixation in legume crops. The OC and IR antagonistic interactions could increase crop tolerance to Mn stress from promoting stem ureide development and amino acid holding.
- Subjects
EFFECT of manganese on plants; UREIDES; NITROGEN fixation; BEANS; PHOTOSYNTHESIS; EFFECT of acids on plants
- Publication
BMC Plant Biology, 2016, Vol 16, p86
- ISSN
1471-2229
- Publication type
Article
- DOI
10.1186/s12870-016-0904-3