Abstract
The effect of exogenous ABA on acquisition of desiccation tolerance has been well documented for the embryos of several species. including maize ( Zea mays L.). It has also been suggested that endogenous ABA plays a role in regulating the same phenomena. To test this hypothesis, endogenous ABA was quantified by radioimmunoassay. Our results show that: (1) during embryogenesis in maize, endogenous ABA increase‐concomitantly with the acquisition of desiccation tolerance: (2) ABA deficient embryos of the vp 5 mutant are desiccation intolerant, but tolerance can he induced by exogenous ABA: and (3) desiccation tolerance is acquired if desiccation sensitive embryos undergo a slow drying treatment, during which ABA increases. However, when embryos were preincubated in fluridone to prevent ABA accumulation during slow drying, desiccation tolerance was induced in spite of the low level of endogenous ABA in the embryo. Our results cast doubts on an exclusive role of ABA in the acquisition of desiccation tolerance in maize embryo.
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Claims 6
Claim · model-written summary
Endogenous ABA increased during maize embryogenesis alongside acquisition of desiccation tolerance.
- Organ / stage
- embryogenesise0
- Compound
- endogenous ABAe0
- Outcome
- desiccation tolerancee0
- Direction
- increasee0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“during embryogenesis in maize, endogenous ABA increase‐concomitantly with the acquisition of desiccation tolerance”
Claim · model-written summary
ABA deficient vp 5 embryos were desiccation intolerant.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA deficient embryos of the vp 5 mutant are desiccation intolerant”
e1“during embryogenesis in maize”
Claim · model-written summary
Exogenous ABA induced desiccation tolerance in vp 5 embryos.
- Material
- vp 5 mutante0
- Treatment
- exogenous ABAe0
- Outcome
- tolerancee0
- Direction
- inducede0
- Comparator
- ABA deficient embryose0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA deficient embryos of the vp 5 mutant are desiccation intolerant, but tolerance can he induced by exogenous ABA”
e1“during embryogenesis in maize”
Claim · model-written summary
Slow drying induced desiccation tolerance in initially sensitive embryos.
- Treatment
- slow drying treatmente0
- Outcome
- desiccation tolerancee0
- Direction
- acquirede0
- Comparator
- desiccation sensitive embryose0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“desiccation tolerance is acquired if desiccation sensitive embryos undergo a slow drying treatment”
e1“during embryogenesis in maize”
Claim · model-written summary
ABA increased during slow drying of embryos.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“during which ABA increases”
e1“desiccation sensitive embryos undergo a slow drying treatment”
e2“during embryogenesis in maize”
Claim · model-written summary
Fluridone-preincubated embryos gained desiccation tolerance during slow drying despite low endogenous ABA.
- Treatment
- preincubated in fluridonee0
- Outcome
- desiccation tolerancee0
- Direction
- inducede0
- Qualifier
- in spite of the low level of endogenous ABAe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when embryos were preincubated in fluridone to prevent ABA accumulation during slow drying, desiccation tolerance was induced in spite of the low level of endogenous ABA in the embryo”
e1“during embryogenesis in maize”
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