01.02.2013 Views

Page 2 Plant-Bacteria Interactions Edited by Iqbal Ahmad, John ...

Page 2 Plant-Bacteria Interactions Edited by Iqbal Ahmad, John ...

Page 2 Plant-Bacteria Interactions Edited by Iqbal Ahmad, John ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

186j 9 Rice–Rhizobia Association: Evolution of an Alternate Niche<br />

Figure 9.8 GLC/MS fractionation and identification of phytohormones<br />

in the culture supernatant of rice-adapted rhizobial<br />

endophyte strain E11. From Yanni et al. [7] and reprinted with<br />

permission from CSIRO Publishing (http://www.publish.csiro.<br />

au/journals/fpb).<br />

phosphate) and organic (inositol hexaphosphate ¼ phytate) insoluble phosphorus<br />

complexes [7]. These positive results indicate extracellular acidification and phosphatase<br />

enzyme (phytase) activity, respectively. This extracellular PGP þ activity<br />

would potentially increase the availability of phosphorus for rice in rhizosphere<br />

soil, and there<strong>by</strong> promote rice growth when soil phosphorus is limited.<br />

9.7.4<br />

Endophytic Nitrogen Fixation<br />

Rice plants accumulate more shoot and grain nitrogen when inoculated with selected<br />

strains of rhizobial endophytes [1,7,58]. However, this additional combined<br />

nitrogen is mainly derived from soil mineral nitrogen and not from biological<br />

nitrogen fixation (BNF). This conclusion is based on several lines of evidence:

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!