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Abstract An ethylene-inducing xylanase (EIX) from Tricohoderma viride is a potent elicitor of ethylene bio-
 

Summary: Abstract An ethylene-inducing xylanase (EIX) from
Tricohoderma viride is a potent elicitor of ethylene bio-
synthesis, localized cell death and other defense respons-
es in specific cultivars of tobacco (Nicotiana tabacum)
and tomato (Lycopersicon esculentum). Wild species of
tomato, such as Lycopersicon cheesmanii and Lycopers-
icon pennellii, do not respond to EIX treatment. The F1
progeny of a L. esculentum×L. cheesmanii and a L. escu-
lentum×L. pennellii cross responded to EIX treatment
with an increase in ethylene biosynthesis and the induc-
tion of localized cell death. The F2 progeny of the above
mentioned crosses segregated 3:1 (responding:non-re-
sponding). We mapped the EIX-responding locus (Eix)
to the short arm of chromosome 7 using a population of
introgression lines (ILs), containing small RFLP-defined
chromosome segments of L. pennellii introgressed into
L. esculentum. RFLP analysis of 990 F2 plants that seg-
regated for the introgressed segment mapped the Eix lo-
cus 0.1 cM and 0.9 cM from the flanking markers TG61
and TG131, respectively. Using the marker TG61 we

  

Source: Avni, Adi - Department of Plant Sciences, Tel Aviv University

 

Collections: Biology and Medicine