FIGURE 14.6 Proposed model of how rhizobial nod factor interacts with the early nodulin proteins NFR1 and NFR5 to promote root-hair curling. LYK3 is hypothesized to be involved in infection-thread growth. Reproduced from Parniske and Downie (2003) by permission of the publisher and the authors.
Glomus, implying there are common molecular signals for root infection of plants by AM fungi and rhizobia. The temporal spectrum of physiological and genetic changes occurring during nodule organogenesis is just beginning to be understood. The emerging picture seems to indicate that nod-signal activities result in changes of endogenous phytohormone levels and changes in the sensitivity of specific plant tissues to the actions of these phytohormones.
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