Download Opportunities for Biological Nitrogen Fixation in Rice and by J. K. Ladha, F. J. de Bruijn, K. A. Malik (auth.), J. K. PDF

By J. K. Ladha, F. J. de Bruijn, K. A. Malik (auth.), J. K. Ladha, F. J. de Bruijn, K. A. Malik (eds.)

During the subsequent 30 years, farmers needs to produce 70% extra rice than the 550 hundreds of thousands plenty produced this day to feed the expanding inhabitants. Nitrogen (N) is the nutrient that the majority often limits rice creation. At present degrees ofN use potency, we'll require at the least double the ten million a whole lot N fertilizer which are presently used every year for rice creation. worldwide agriculture now is predicated seriously on N fertilizers derived from petroleUIll, which, in flip, is at risk of political and financial fluctuations within the oil markets. N fertilizers, accordingly, are dear inputs, costing agriculture greater than US$45 billion every year. Rice suffers from a mismatch of its N call for and N provided as fertilizer, leading to a 50-70% lack of utilized N fertilizer. simple techniques can be used to resolve this challenge One is to manage the timing ofN software in line with wishes of the crops, hence in part expanding the potency of the crops' use of utilized N. the opposite is to extend the power of the rice approach to mend its personal N. The latter technique is a long term technique, however it might have huge, immense environmental advantages whereas assisting resource-poor farmers. in addition, farmers extra simply undertake a genotype or kind with necessary characteristics than they do crop and soil administration practices that could be linked to extra costs.

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Extra resources for Opportunities for Biological Nitrogen Fixation in Rice and Other Non-Legumes: Papers presented at the Second Working Group Meeting of the Frontier Project on Nitrogen Fixation in Rice held at the National Institute for Biotechnology and Genetic Engineerin

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Seeds showing no contamination were placed in 25 mm x 200 mm tubes containing either 25 mL of semisolid modified Fahraeus medium (Fahraeus, 1957) or sterile sand watered with Fahraeus medium. Seedlings grown in sand were watered with Fahraeus medium on a regular basis during the remainder of the growth period. Bacteria were isolated from the inoculated seedlings as follows. Seedlings were grown from 23 to 25 days before re-isolation of the bacteria and carefully removed from the growth tubes to keep the roots intact.

BioI. 14, 638-639. ln Nucleic Acid Amplification Methods forthe Analysis of Environmental Samples. Ed. G Toranzos. pp 63-93. , Lancaster, PA. Maidak B L, Larsen N, McCaughey M J, Overbeek R, Olsen G J, Fogel K, Blandy J and Woese C R 1994 The ribosomal database project. Nucleic Acids Res. 22, 3485-3487. Malarvithi P P 1995 Association of endophytic diazotrophs in rice genotypes from various soil environments and estimation of their BNF potential using 15N dilution methods. PhD thesis submitted to the University of Philippines.

Escherichia coli DH5o: was chosen as a negative control because it is unlikely that this bacterium would colonize rice roots endophytically. , 1997). Rhizobium meliloti 1021 was included to compare a Rhizobium with Azorhizobium caulinodans ORS571 in its ability to colonize rice roots. Azoarcus indigens LMG9092 and Herbaspirilfum seropedicae Z67 were included since these two bacteria have previously been reported to invade rice tissues (see Reinhold-Hurek and Hurek, 1997). In order to further characterize the endophytic isolates from rice, a partial DNA sequence of their 16s rDNA was determined.

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