TY - JOUR
T1 - Effect of seed on ripening control components during avocado fruit development
AU - Hershkovitz, Vera
AU - Friedman, Haya
AU - Goldschmidt, Eliezer E.
AU - Feygenberg, Oleg
AU - Pesis, Edna
PY - 2011/12/15
Y1 - 2011/12/15
N2 - Seedless avocado fruit are produced alongside seeded fruit in the cultivar Arad, and both reach maturity at the same time. Using this system, it was possible to show that avocado seed inhibits the ripening process: seedless fruits exhibited higher response to exogenous ethylene already at the fruitlet stage, and also at the immature and mature fruit stages. They produced higher CO 2 levels, and the ethylene peak was apparent at the fruitlet stage of seedless fruit, but not of seeded ones. The expression levels of PaETR, PaERS1 and PaCTR1 on the day of harvest at all developmental stages were very similar between seeded and seedless fruit, except that PaCTR1 was higher in seedless fruit only at very early stages. This expression pattern suggests that the seed does not have an effect on components of the ethylene response pathway when fruits are just picked. The expression of MADS-box genes, PaAG1 and PaAGL9, preceded the increase in ethylene production of mature seeded fruit, but not at earlier stages. However, only PaAGL9 was induced in seedless fruit at early stages of development. Taken together, these data suggest that these genes are perhaps involved in climacteric response in seeded fruit, and the seed is responsible for their induction at normal fruit ripening.
AB - Seedless avocado fruit are produced alongside seeded fruit in the cultivar Arad, and both reach maturity at the same time. Using this system, it was possible to show that avocado seed inhibits the ripening process: seedless fruits exhibited higher response to exogenous ethylene already at the fruitlet stage, and also at the immature and mature fruit stages. They produced higher CO 2 levels, and the ethylene peak was apparent at the fruitlet stage of seedless fruit, but not of seeded ones. The expression levels of PaETR, PaERS1 and PaCTR1 on the day of harvest at all developmental stages were very similar between seeded and seedless fruit, except that PaCTR1 was higher in seedless fruit only at very early stages. This expression pattern suggests that the seed does not have an effect on components of the ethylene response pathway when fruits are just picked. The expression of MADS-box genes, PaAG1 and PaAGL9, preceded the increase in ethylene production of mature seeded fruit, but not at earlier stages. However, only PaAGL9 was induced in seedless fruit at early stages of development. Taken together, these data suggest that these genes are perhaps involved in climacteric response in seeded fruit, and the seed is responsible for their induction at normal fruit ripening.
KW - 1-MCP
KW - Ethylene
KW - Ethylene receptors
KW - Fruitlets
KW - MADS-box
KW - Seedless
UR - http://www.scopus.com/inward/record.url?scp=80955158475&partnerID=8YFLogxK
U2 - 10.1016/j.jplph.2011.07.010
DO - 10.1016/j.jplph.2011.07.010
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
C2 - 21930327
AN - SCOPUS:80955158475
SN - 0176-1617
VL - 168
SP - 2177
EP - 2183
JO - Journal of Plant Physiology
JF - Journal of Plant Physiology
IS - 18
ER -