Wednesday, October 20, 2010

Jatropha, a Feedstock Needing Improvement

By Daniela Sciaky, Ph.D.


SG Biofuels in August 2010 announced the completion of the Jatropha curcas L. sequence and this month announced development of proprietary Jatropha hybrid seed technology. Investors may question the significance of these two announcements in light of the supposed advantages of Jatropha. The surge to use this “wonder” plant for biofuel production has led to a sudden rash of decisions without considering how well an unimproved plant such as Jatropha will respond to plantation growth in suboptimal conditions. SG Biofuels and D1 Oils are just two of the companies seeking to improve Jatropha for plantation growth and for other characteristics such as oil yield using conventional technology and biotechnology.

Jatropha curcas L., a non-edible shrub, is considered to be a drought tolerant plant capable of growing on arid wastelands with little input. Under these conditions Jatropha is still able to yield up to 300 gallons of oil per acre.  Based on these characteristics large numbers of Jatropha plantations have been established in order to produce oil for biofuel production and animal feed.

However Jatropha cultivation on a plantation scale has not been totally successful. One reason for failure of these plantations may be that Jatropha is not naturally found in regions with arid and semi-arid climate conditions nor is it found in regions of less than 944 mm annual precipitation. Recent experiments have also shown that productivity of Jatropha decreases with drought. However Jatropha, unlike many other crops, is able to recover from drought stress.

SG Biofuels has established a Genetic Resource Center to help the company generate hybrids in a manner similar to what has been successful for corn. SG Biofuels, with Life Technologies, has also completed the sequence of Jatropha. The sequence will be used to identify traits to improve fruit yield, pest resistance, flowering capabilities, soil adaption, uniformity and harvesting.

D1 Oils is identifying optimal sites for Jatropha cultivation by examining day length, water availability, latitude, altitude and land use by other crops. Other factors, including plant density, water and fertilizer use, land preparation, intercropping, pest and diseases, pruning regimens and harvesting time and techniques, are under examination. D1 Oils has also established a breeding program in order to develop varieties suitable for plantation cultivation around the world.

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