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Calendar Name: seminars
Scheduled for: Wednesday, May 11 2011, 14:00 - 15:30
Event text:    Dr Hinanit Koltai
	       
	       Department Of Ornamental Horticulture
	       Institute of Plant Sciences
	       ARO, Volcani center
	       
	       Bet-Dagan
	       ISRAEL
Details:       “Strigolactones are regulators of root development”
	       
	       ABSTRACT
	       Strigolactones (SLs) or associated molecules were
	       defined as a new group of plant hormones that suppress
	       lateral shoot branching. Recently, we have demonstrated
	       that SLs are regulators of root development: they
	       regulate lateral root formation and root hair
	       elongation. Moreover, the epistatic relations between
	       SLs, auxin and ethylene were determined in the wild type
	       and hormone-signaling mutants. In tomato SLs were shown
	       to interfere with the activity of auxin-efflux carriers
	       in the presence of exogenously applied auxin, thereby
	       affecting primary root growth, cell elongation and root
	       hair elongation in tomato. In Arabidopsis SLs and
	       ethylene were found to regulate root hair elongation via
	       a common regulatory pathway, in which ethylene is
	       epistatic to SLs, whereas SLs' effect on root hair
	       elongation requires ethylene synthesis. SL signaling was
	       not needed for the auxin root hair-response. Auxin
	       signaling, on the other hand, was not necessary, but
	       enhanced the root hair response to SLs. The results
	       suggest that the SL, ethylene and auxin hormonal
	       pathways converge for regulation of root hair
	       elongation. Moreover, SL regulation of root growth
	       suggests that these hormones are mediators of plant
	       responses to nutritional conditions and coordinators of
	       shoot and root development. However, SLs are also signal
	       molecules that facilitate hyphal branching of the
	       symbiotic arbuscular mycorrhizal fungi and thus,
	       plant-symbiotic interactions. The two roles played by
	       SLs, in plant development and symbiotic communication,
	       may imply their evolution as either modulators of plant
	       development or enhancers of beneficial plant
	       associations.

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