Abstract
A study has been made to identify the contribution of senescent changes occurring in embryonic and non‐embryonic (endosperm and aleurone layer) tissues on germination of wheat ( Triticum durum L. cv. Appulo) seed lots of 97, 93 and 70% viability. Measurements of germination and rates of macromolecular synthesis of embryos excised from dry seeds showed that as seed viability declined from 97 to ca 93%, there was a decrease in the capacity of embryos to grow and synthesise protein, RNA and DNA. However, no significant differences were observed between embryos from 93 and 70% viability seed stocks. Changes in nutrients, fresh and dry weights of embryonic and non‐embryonic tissues and electrophoretic patterns of endosperm proteins by sodium dodecyl‐sulfate polyacrylamide gel electrophoresis showed a reduced mobilisation of reserve material in 70%‐viable seeds. α‐Amylase (EC 3.2.1.1) production was also decreased. It is suggested that alterations occurring in non‐embryonic structures play a significant role in seed viability loss. This role might be mediated by failing nutrient supply, but the involvement of some inhibitor or toxic substance is also possible.
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Claims 7
Claim · model-written summary
As viability fell from 97 to about 93%, embryo growth and macromolecular synthesis decreased.
- Outcome
- capacity of embryos to grow and synthesise protein, RNA and DNAe0
- Direction
- decreasee0
- Comparator
- 97 to ca 93%e0
Not reportedTaxon
Verbatim
e0“as seed viability declined from 97 to ca 93%, there was a decrease in the capacity of embryos to grow and synthesise protein, RNA and DNA”
Claim · model-written summary
Embryos from 93 and 70% viability stocks did not differ significantly.
- Outcome
- differencese0
- Direction
- no significant differencese0
- Comparator
- 93 and 70% viability seed stockse0
Not reportedTaxon
Verbatim
e0“no significant differences were observed between embryos from 93 and 70% viability seed stocks”
Claim · model-written summary
Reserve mobilization was reduced in 70%-viable seeds.
Not reportedTaxon
Verbatim
e0“reduced mobilisation of reserve material in 70%‐viable seeds”
Claim · model-written summary
Alpha-amylase production decreased.
Not reportedTaxon
Verbatim
e0“α‐Amylase (EC 3.2.1.1) production was also decreased”
Claim · model-written summary
The authors suggest non-embryonic alterations contribute to seed viability loss.
Not reportedTaxon
Verbatim
e0“alterations occurring in non‐embryonic structures play a significant role in seed viability loss”
Claim · model-written summary
Failing nutrient supply may mediate this effect.
Not reportedTaxon
Verbatim
e0“This role might be mediated by failing nutrient supply”
Claim · model-written summary
An inhibitor or toxic substance may also contribute.
- Outcome
- involvement of some inhibitor or toxic substancee0
- Qualifier
- some inhibitor or toxic substancee0
Not reportedTaxon
Verbatim
e0“the involvement of some inhibitor or toxic substance is also possible”