Nodulation in the Legume Biofuel Feedstock Tree Pongamia pinnata

Samuel, Sharon; Scott, Paul T.; Gresshoff, Peter M.

doi:10.1007/s40003-013-0074-6

Cited by 29 publications

(39 citation statements)

References 33 publications

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“…The plant is a legume (like soybean, clover, peanut, and acacia) and as such is capable of symbiotic nitrogen fixation through root nodulation 13,14 ( Figure 1A). Significantly, it is a tree and as such large and long-lived, with annual harvests of its oil-rich seeds ( Figure 1B).…”

Section: Pongamia Root Nodulation and Symbiotic Nitrogen Fixationmentioning

confidence: 99%

A new bioenergy crop based on oil-rich seeds from the legume tree <em>Pongamia pinnata</em>

Gresshoff¹,

Rangan²,

Indrasumunar³

et al. 2017

EECT

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Any informed discussion on the future sources of energy in our world requires the consideration of renewable biofuels. These are produced by biological processes, such as plant growth based on photosynthesis and microbes using waste products from diverse origins. Many biofuels, such as ethanol produced from plants like sugarcane, are seen as sustainable, such paradigms should be critically analyzed in terms of total inputs. The legume tree Pongamia pinnata (also called Millettia pinnata) offers a substantiated opportunity for a sustainable biofuel feedstock. It is characterized by fast plant growth, broad tropical and subtropical growth habitat, and high annual yields of oil-rich seed. Annual yield of the seed-extracted oil, rich in the monounsaturated fatty acid oleic acid (C18:1), is between 1,000 and 5,000 L/ha, depending on local conditions, including rainfall, temperature, and soil. It can be burnt in bioenergy generators to yield electrical output. It can also be converted to biodiesel by transesterification for transportation and industrial use. Conversion to aviation jet fuel by hydrogenation and subsequent purification is also possible. The legume nature of the plant allows it to harbor nitrogen-fixing soil bacteria (broadly called "rhizobia") in newly induced root organs called nodules. This symbiosis makes the energy inputs considerably less than those seen with nitrate fertilizer -requiring biofuel feedstocks, such as corn, sugarcane, and canola. Combined with general characteristics of plant, such as abundant seed set and large oil-rich seed, secondary products, such as seed meal and vigorous growth characteristics, make this tree an excellent candidate for sustainable bioenergy production in many parts of the globe.

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Section: Pongamia Root Nodulation and Symbiotic Nitrogen Fixationmentioning

confidence: 99%

A new bioenergy crop based on oil-rich seeds from the legume tree <em>Pongamia pinnata</em>

Gresshoff¹,

Rangan²,

Indrasumunar³

et al. 2017

EECT

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“…The selection of superior rhizobial strains for Pongamia is of utmost importance as it will help to promote growth and potentially increase yields of oil‐rich seeds. Towards this end, our lab (Samuel et al, 2013) tested a wide range of bacterial strains from Australia and India and established Bradyrhizobium japonicum strains CB1809 and USDA 110 as the best inocula tested. The nodules produced by these strains were larger with more uniformly and extensively filled infected zones (Fig.…”

Section: Nodulation and Nitrogen Fixationmentioning

confidence: 99%

Genetic and Genomic Analysis of the Tree Legume Pongamia pinnata as a Feedstock for Biofuels

et al. 2013

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The tree legume Pongamia {Pongamia pinnata (L.) Pierre [syn. Millettia pinnata (L.) Panigrahi]} is emerging as an important biofuels feedstock. It produces about 30 kg per tree per year of seeds, containing up to 55% oil (w/v), of which approximately 50% is oleic acid (C 18:1 ). The capacity for biological N fixation places Pongamia in a more sustainable position than current nonlegume biofuel feedstocks. Also due to its drought and salinity tolerance, Pongamia can grow on marginal land not destined for production of food. As part of the effort to domesticate Pongamia our research group at The University of Queensland has started to develop specific genetic and genomic tools. Much of the preliminary work to date has focused on characterizing the genetic diversity of wild populations. This diversity is reflective of the outcrossing reproductive biology of Pongamia and necessitates the requirement to develop clonal propagation protocols. Both the chloroplast and mitochondrial genomes of Pongamia have been sequenced and annotated (152,968 and 425,718 bp, respectively), with similarities to previously characterized legume organelle genomes. Many nuclear genes associated with oil biosynthesis and nodulation in Pongamia have been characterized. The continued application of genetic and genomic tools will support the deployment of Pongamia as a sustainable biofuel feedstock.

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“…However, progress of these attempts is greatly hampered by the genetic complexity of salt tolerance, which largely depends on physiological and genetic diversity of the plant and spatio-temporal heterogeneity of soil salinity (Morton et al, 2019). To address this issue, several plant species were introduced to rehabilitate the saline lands and certain economically important nitrogen fixing biofuel tree species are of immense importance not only for sustenance to saline marginal lands but also economic gain towards saline lands (Samuel et al, 2013; Hanin et al, 2016; Marriboina Attipalli, 2020a).…”

Section: Introductionmentioning

confidence: 99%

Systematic hormone-metabolite network provides insights of high salinity tolerance inPongamia pinnata(L.) pierre

Marriboina

Sharma

Sengupta

et al. 2020

Preprint

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Salinity stress results significant losses in plant productivity, and loss of cultivable lands. Although Pongamia pinnata is reported to be a salt tolerant semiarid tree crop, the adaptive mechanisms to saline environment are elusive. The present investigation describes alterations in hormonal and metabolic responses in correlation with physiological and molecular variations in leaves and roots of Pongamia at sea salinity level (3% NaCl) for 8 days. At physiological level, salinity induced adjustments in plant morphology, leaf gas exchange and ion accumulation patterns were observed. Our study also revealed that phytohormones including JAs and ABA play crucial role in promoting the salt adaptive strategies such as apoplasmic Na+ sequestration and cell wall lignification in leaves and roots of Pongamia. Correlation studies demonstrated that hormones including ABA, JAs and SA showed a positive interaction with selective compatible metabolites (sugars, polyols and organic acids) to aid in maintaining osmotic balance and conferring salt tolerance to Pongamia. At the molecular level, our data showed that differential expression of transporter genes as well as antioxidant genes regulate the ionic and ROS homeostasis in Pongamia. Collectively, these results shed new insights on an integrated physiological, structural, molecular and metabolic adaptations conferring salinity tolerance to Pongamia.High lightOur data, for the first time, provide new insights for an integrated molecular and metabolic adaptation conferring salinity tolerance in Pongamia. The present investigation describes alterations in hormonal and metabolic responses in correlation with physiological and molecular variations in Pongamia at sea salinity level (3% NaCl) for 8 days.

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Nodulation in the Legume Biofuel Feedstock Tree Pongamia pinnata

Cited by 29 publications

References 33 publications

A new bioenergy crop based on oil-rich seeds from the legume tree <em>Pongamia pinnata</em>

A new bioenergy crop based on oil-rich seeds from the legume tree <em>Pongamia pinnata</em>

Genetic and Genomic Analysis of the Tree Legume Pongamia pinnata as a Feedstock for Biofuels

Systematic hormone-metabolite network provides insights of high salinity tolerance inPongamia pinnata(L.) pierre

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