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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Front+Plant+Sci
2017 ; 8
(ä): 392
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The Role of Endogenous Strigolactones and Their Interaction with ABA during the
Infection Process of the Parasitic Weed Phelipanche ramosa in Tomato Plants
#MMPMID28392795
Cheng X
; Floková K
; Bouwmeester H
; Ruyter-Spira C
Front Plant Sci
2017[]; 8
(ä): 392
PMID28392795
show ga
The root parasitic plant species Phelipanche ramosa, branched broomrape, causes
severe damage to economically important crops such as tomato. Its seed
germination is triggered by host-derived signals upon which it invades the host
root. In tomato, strigolactones (SLs) are the main germination stimulants for P.
ramosa. Therefore, the development of low SL-producing lines may be an approach
to combat the parasitic weed problem. However, since SLs are also a plant hormone
controlling many aspects of plant development, SL deficiency may also have an
effect on post-germination stages of the infection process, during the
parasite-host interaction. In this study, we show that SL-deficient tomato plants
(Solanum lycopersicum; SlCCD8 RNAi lines), infected with pre-germinated P. ramosa
seeds, display an increased infection level and faster development of the
parasite, which suggests a positive role for SLs in the host defense against
parasitic plant invasion. Furthermore, we show that SL-deficient tomato plants
lose their characteristic SL-deficient phenotype during an infection with P.
ramosa through a reduction in the number of internodes and the number and length
of secondary branches. Infection with P. ramosa resulted in increased levels of
abscisic acid (ABA) in the leaves and roots of both wild type and SL-deficient
lines. Upon parasite infection, the level of the conjugate ABA-glucose ester
(ABA-GE) also increased in leaves of both wild type and SL-deficient lines and in
roots of one SL-deficient line. The uninfected SL-deficient lines had a higher
leaf ABA-GE level than the wild type. Despite the high levels of ABA, stomatal
aperture and water loss rate were not affected by parasite infection in the
SL-deficient line, while in wild type tomato stomatal aperture and water loss
increased upon infection. Future studies are needed to further underpin the role
that SLs play in the interaction of hosts with parasitic plants and which other
plant hormones interact with the SLs during this process.