Ethylene and Abscisic Acid Signaling Pathways Differentially Influence Tomato Resistance to Combined Powdery Mildew and Salt Stress

There is currently limited knowledge on the role of hormones in plants responses to combinations of abiotic and pathogen stress factors. This study focused on the response of tomato near-isogenic lines (NILs) that carry the , and loci, conferring resistance to tomato powdery mildew (PM) caused by ,...

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Bibliographic Details
Published in:Frontiers in plant science 2017-01, Vol.7, p.2009-2009
Main Authors: Kissoudis, Christos, Seifi, Alireza, Yan, Zhe, Islam, A T M Tanjimul, van der Schoot, Hanneke, van de Wiel, Clemens C M, Visser, Richard G F, van der Linden, C G, Bai, Yuling
Format: Article
Language:English
Subjects:
Abscisic acid
Callose
Cell death
Chitinase
Plant Science
ROS burst
Senescence
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Summary:There is currently limited knowledge on the role of hormones in plants responses to combinations of abiotic and pathogen stress factors. This study focused on the response of tomato near-isogenic lines (NILs) that carry the , and loci, conferring resistance to tomato powdery mildew (PM) caused by , to combined PM and salt stress. These NILs were crossed with the (ABA-deficient), (JA-deficient), and (ET overproducer) tomato mutants to investigate possible roles of hormone signaling in response to combined stresses. In the NILs, marker genes for hormonal pathways showed differential expression patterns upon PM infection. The mutation resulted in breakdown of resistance in NIL-Ol-1 and NIL-ol-2. This was accompanied by reduced callose deposition, and was more pronounced under combined salt stress. The mutation resulted in H O overproduction and reduced susceptibility to PM in NIL-Ol-1 under combined stress, but lead to higher plant growth reduction under salinity and combined stress. Resistance in NIL-ol-2 was compromised by the mutation, which was potentially caused by reduction of callose deposition. Under combined stress the compromised resistance in NIL-ol-2 was restored. PM resistance in NIL-Ol-4 remained robust across all mutant and treatment combinations. Hormone signaling is critical to the response to combined stress and PM, in terms of resistance and plant fitness. ABA appears to be at the crossroads of disease susceptibility/senescence and plant performance under combined stress These gained insights can aid in narrowing down targets for improving crop performance under stress combinations.
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2016.02009