Comprehensive hormone profiling in developing Arabidopsis seeds: examination of the site of ABA biosynthesis, ABA transport and hormone interactions.
ABA plays important roles in many aspects of seed development, including accumulation of storage compounds, acquisition of desiccation tolerance, induction of seed dormancy and suppression of precocious germination. Quantification of ABA in the F(1) and F(2) populations originated from crosses between the wild type and an ABA-deficient mutant aba2-2 demonstrated that ABA was synthesized in both maternal and zygotic tissues during seed development. In the absence of zygotic ABA, ABA synthesized in maternal tissues was translocated into the embryos and partially induced seed dormancy. We also analyzed the levels of ABA metabolites, gibberellins, IAA, cytokinins, jasmonates and salicylic acid (SA) in the developing seeds of the wild type and aba2-2. ABA metabolites accumulated differentially in the silique and seed tissues during development. Endogenous levels of SA were elevated in aba2-2 in the later developmental stages, whereas that of IAA was reduced compared with the wild type. These data suggest that ABA metabolism depends on developmental stages and tissues, and that ABA interacts with other hormones to regulate seed developmental processes.
RIKEN Plant Science Center, Yokohama, Kanagawa, 230-0045 Japan.
Yuri
Y
Kanno
Yusuke
Y
Jikumaru
Atsushi
A
Hanada
Eiji
E
Nambara
Suzanne R
SR
Abrams
Yuji
Y
Kamiya
Mitsunori
M
Seo
D000040:Abscisic Acid / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D017360:Arabidopsis / Q000196:embryology / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D001692:Biological Transport; D018506:Gene Expression Regulation, Plant; D018525:Germination / Q000235:genetics; D009154:Mutation / Q000235:genetics; D057445:Plant Dormancy / Q000235:genetics; D010937:Plant Growth Regulators / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D020156:Salicylic Acid / Q000032:analysis / Q000378:metabolism; D012639:Seeds / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D013997:Time Factors
D010937:Plant Growth Regulators; D000040:Abscisic Acid; D020156:Salicylic Acid