Defense responses in aspen with altered pectin methylesterase activity reveal the hormonal inducers of tyloses
PBN-AR
Instytucja
Wydział Biologiczno-Chemiczny (Uniwersytet w Białymstoku)
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
angielski
Czasopismo
Plant Physiology (45pkt w roku publikacji)
ISSN
0032-0889
EISSN
1532-2548
Wydawca
The American Society of Plant Biologists
DOI
Rok publikacji
2017
Numer zeszytu
2
Strony od-do
1409-1419
Numer tomu
173
Identyfikator DOI
Liczba arkuszy
1,65
Autorzy
Pozostali autorzy
+ 5
Słowa kluczowe
angielski
Tyloses; xylem oclusion; ACC; JA; ethylene
Streszczenia
Język
angielski
Treść
Tyloses are ingrowths of parenchyma cells into the lumen of embolized xylem vessels, thereby protecting the remaining xylem from pathogens. They are found in heartwood, sapwood and in abscission zones, and can be induced by various stresses, but their molecular triggers are unknown. Here we report that down-regulation of PECTIN METHYLESTERASE 1 (PtxtPME1) in aspen triggers the formation of tyloses and activation of oxidative stress. We tested whether any of the oxidative-stress related hormones could induce tyloses in intact plantlets grown in sterile culture. Jasmonates, including jasmonic acid (JA) and methyl jasmonate (MeJA), induced the formation of tyloses whereas treatments with salicylic acid (SA) and 1-aminocyclopropane-1-carboxylic acid (ACC) were ineffective. SA abolished the the induction of tyloses by JA, whereas ACC was synergistic with JA. The ability of ACC to stimulate tyloses formation when combined with JA depended on ethylene (Et) signaling, as shown by a decrease in the response in Et-insensitive plants. Measurements of internal ACC and JA concentrations in wild-type and Et-insensitive plants treated simultaneously with these two compounds indicated that ACC and JA regulate each other's concentration in an Et-dependent manner. The findings indicate that jasmonates acting synergistically with ethylene are the key molecular triggers of tyloses.
Cechy publikacji
publikacja naukowa oryginalna
Inne
System-identifier
000040452
CrossrefMetadata from Crossref logo
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