Sweet Potato Root and Biomass Production with and without Nitrogen Fertilization

Hill, Walter A.; Hortense, Dodo; Hahn, S. K.; Mulongoy, K.; Adeyeye, S. O.

doi:10.2134/agronj1990.00021962008200060019x

Cited by 40 publications

(41 citation statements)

References 4 publications

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“…Further studies are needed to determine if the endophytes might contribute to the N input in sweet potato plants that grow well in unfertile soil. Previous reports indicated that associative N 2 fixation contributes to the N uptake in sweet potato plants (Yoneyama et al 1998;Hill et al 1990). Nitrogen fixing endophytes like Azospirillum sp.…”

Section: Discussionmentioning

confidence: 98%

Characterization of bacterial endophytes of sweet potato plants

2009

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Endophytic bacteria associated with sweet potato plants (Ipomoea batatas (L.) Lam.) were isolated, identified and tested for their ability to fix nitrogen, produce indole acetic acid (IAA), and exhibit stress tolerance. Eleven different strains belonging to the genera, Enterobacter, Rahnella, Rhodanobacter, Pseudomonas, Stenotrophomonas, Xanthomonas and Phyllobacterium, were identified. Four strains were shown to produce IAA (a plant growth hormone) and one strain showed the ability to grow in nitrogen free medium and had the nitrogenase subunit gene, nifH. To determine if IAA production by the endophytes had any role in protecting the cells against adverse conditions, different stress tests were conducted. The IAA producer grew well in the presence of some antibiotics, UV and cold treatments but the response to pH, osmotic shock, thermal and oxidative treatments was the same for both the IAA producer and the no IAA producer. To determine if IAA produced by the strains was biologically relevant to plants, cuttings of poplar were inoculated with the highest IAA producing strain. The inoculated cuttings produced roots sooner and grew more rapidly than uninoculated cuttings. These studies indicate that endophytes of sweet potato plants are beneficial to plant growth.

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Section: Discussionmentioning

confidence: 98%

Characterization of bacterial endophytes of sweet potato plants

2009

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“…Sweet potato has high N requirements but can produce reasonable yields in soils of poor fertility (Hill et al, 1990). This may be partly caused by its capacity to fix atmospheric N through association with symbiotic, non-nodulating bacteria.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen use efficiency of taro and sweet potato in the humid lowlands of Papua New Guinea

Hartemink

Johnston

O’Sullivan

et al. 2000

Agriculture, Ecosystems & Environment

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Root crops are an important staple food in the Pacific region. Yields are generally low and inorganic fertilizers are deemed an option to increase root crop production. The effects of inorganic N fertilizers on upland taro (Colocasia esculenta (L.) Schott) and sweet potato (Ipomoea batatas (L.) Lam.) were quantified with the aim to investigate relationships between inherent soil fertility, N uptake, N application rates and crop yield. The research took place on a sandy, Typic Tropofluvents in the humid lowlands of Papua New Guinea. Five levels of fertilizer N (0,100, 200, 300 and 400 kg ha −1 ) were given in split applications. The yield of marketable taro corms was not affected by N fertilizer but non-marketable corm yield doubled at high N fertilizer rates. High N applications yielded 8-11 Mg ha −1 more taro tops. Marketable and non-marketable sweet potato yield was negatively affected by N fertilizers. High N applications yielded 26 Mg ha −1 more vines than the control treatment. Nitrogen fertilizer significantly reduced the harvest index in both crops. When no fertilizer was applied, the total N uptake of taro was 32.0 kg ha −1 of which 9.7 kg was taken up in the marketable corms. At 400 kg N ha −1 the total N uptake was 67.5 kg ha −1 of which 23% was taken up by the marketable corms. Uptake of N in the marketable sweet potato tubers was less than 11 kg ha −1 and for most treatments more N was taken up in the non-marketable tubers than in the marketable yield. Up to 156 kg N ha −1 was taken up with the sweet potato vines. Despite the negative effect of N on sweet potato yield, sweet potato had a higher N use efficiency than taro due to a higher above-ground biomass production. The N fertilizer recovery was 25% for the sweet potato but only 9% for the taro indicating considerable N losses, likely caused by leaching.

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“…The sweet potato (Ipomoea batatas L.) is known for its ability to grow well in nitrogen (N)-poor soils 16) . It is also known that the total amount of N in sweet potato exceeds the amount of N applied as chemical fertilizer.…”

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confidence: 99%

Expressed nifH Genes of Endophytic Bacteria Detected in Field-Grown Sweet Potatoes (Ipomoea batatas L.)

et al. 2008

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We examined the nitrogenase reductase (nifH) genes of endophytic diazotrophic bacteria expressed in field-grown sweet potatoes (Ipomoea batatas L.) by reverse transcription (RT)-PCR. Gene fragments corresponding to nifH were amplified from mRNA obtained from the stems and storage roots of field-grown sweet potatoes several months after planting. Sequence analysis revealed that these clones were homologous to the nifH sequences of Bradyrhizobium, Pelomonas, and Bacillus sp. in the DNA database. Investigation of the nifH genes amplified from the genomic DNA extracted from these sweet potatoes also showed high similarity to various α-proteobacteria including Bradyrhizobium, β-proteobacteria, and cyanobacteria. These results suggest that bradyrhizobia colonize and express nifH genes not only in the root nodules of leguminous plants but also in sweet potatoes as diazotrophic endophytes.

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Sweet Potato Root and Biomass Production with and without Nitrogen Fertilization

Cited by 40 publications

References 4 publications

Characterization of bacterial endophytes of sweet potato plants

Characterization of bacterial endophytes of sweet potato plants

Nitrogen use efficiency of taro and sweet potato in the humid lowlands of Papua New Guinea

Expressed nifH Genes of Endophytic Bacteria Detected in Field-Grown Sweet Potatoes (Ipomoea batatas L.)

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