Combinational dormancy in seeds of the Western Australian endemic species Diplopeltis huegelii (Sapindaceae)

Shane Turner, David Merritt, J.M. Baskin, C.C. Baskin, Kingsley Dixon

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Seeds of the endemic Western Australian species Diplopeltis huegelii Endl. were successfully germinated after the presence of combinational dormancy was identified, following the observation of selected seed characteristics. D. huegelii seeds were found to have large, fully developed, peripheral coiled embryos ( with no endosperm) that are 7 - 8mm long when uncoiled. Seed-coat dormancy was overcome by dipping seeds in hot water for >= 15 s, but seeds also required a period of after-ripening before they would germinate readily. After-ripening occurred while intact seeds were stored dry at ambient laboratory conditions for 13 months or when scarified (hot-water treated) seeds were stored at 13, 23 or 50% RH at 23 degrees C for 6 weeks. Scarified 13-month-old seeds germinated readily at 7/18, 13/26 and 18/33 degrees C in a 12-h photoperiod and in constant darkness, whereas scarified 1-month-old seeds germinated to <= 43%. Thus, seed dormancy in this species is caused by a water-impermeable seed coat (physical dormancy, PY) and a (non-deep) physiologically dormant embryo (PD), i.e. combinational dormancy (PY + PD). This is only the second report of combinational dormancy in seeds of Sapindaceae and the first report in this family of the PD component of (PY + PD) being broken during dry storage.
Original languageEnglish
Pages (from-to)565-570
JournalAustralian Journal of Botany
Volume54
Issue number6
DOIs
Publication statusPublished - 2006

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Sapindaceae
seed dormancy
dormancy
endemic species
indigenous species
seed
embryo (plant)
seeds
embryo
after-ripening
ripening
water
dipping
endosperm
photoperiod

Cite this

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title = "Combinational dormancy in seeds of the Western Australian endemic species Diplopeltis huegelii (Sapindaceae)",
abstract = "Seeds of the endemic Western Australian species Diplopeltis huegelii Endl. were successfully germinated after the presence of combinational dormancy was identified, following the observation of selected seed characteristics. D. huegelii seeds were found to have large, fully developed, peripheral coiled embryos ( with no endosperm) that are 7 - 8mm long when uncoiled. Seed-coat dormancy was overcome by dipping seeds in hot water for >= 15 s, but seeds also required a period of after-ripening before they would germinate readily. After-ripening occurred while intact seeds were stored dry at ambient laboratory conditions for 13 months or when scarified (hot-water treated) seeds were stored at 13, 23 or 50{\%} RH at 23 degrees C for 6 weeks. Scarified 13-month-old seeds germinated readily at 7/18, 13/26 and 18/33 degrees C in a 12-h photoperiod and in constant darkness, whereas scarified 1-month-old seeds germinated to <= 43{\%}. Thus, seed dormancy in this species is caused by a water-impermeable seed coat (physical dormancy, PY) and a (non-deep) physiologically dormant embryo (PD), i.e. combinational dormancy (PY + PD). This is only the second report of combinational dormancy in seeds of Sapindaceae and the first report in this family of the PD component of (PY + PD) being broken during dry storage.",
author = "Shane Turner and David Merritt and J.M. Baskin and C.C. Baskin and Kingsley Dixon",
year = "2006",
doi = "10.1071/BT05156",
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journal = "Australian Journal of Botany",
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publisher = "CSIRO Publishing",
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}

Combinational dormancy in seeds of the Western Australian endemic species Diplopeltis huegelii (Sapindaceae). / Turner, Shane; Merritt, David; Baskin, J.M.; Baskin, C.C.; Dixon, Kingsley.

In: Australian Journal of Botany, Vol. 54, No. 6, 2006, p. 565-570.

Research output: Contribution to journalArticle

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AU - Turner, Shane

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AU - Baskin, J.M.

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AU - Dixon, Kingsley

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AB - Seeds of the endemic Western Australian species Diplopeltis huegelii Endl. were successfully germinated after the presence of combinational dormancy was identified, following the observation of selected seed characteristics. D. huegelii seeds were found to have large, fully developed, peripheral coiled embryos ( with no endosperm) that are 7 - 8mm long when uncoiled. Seed-coat dormancy was overcome by dipping seeds in hot water for >= 15 s, but seeds also required a period of after-ripening before they would germinate readily. After-ripening occurred while intact seeds were stored dry at ambient laboratory conditions for 13 months or when scarified (hot-water treated) seeds were stored at 13, 23 or 50% RH at 23 degrees C for 6 weeks. Scarified 13-month-old seeds germinated readily at 7/18, 13/26 and 18/33 degrees C in a 12-h photoperiod and in constant darkness, whereas scarified 1-month-old seeds germinated to <= 43%. Thus, seed dormancy in this species is caused by a water-impermeable seed coat (physical dormancy, PY) and a (non-deep) physiologically dormant embryo (PD), i.e. combinational dormancy (PY + PD). This is only the second report of combinational dormancy in seeds of Sapindaceae and the first report in this family of the PD component of (PY + PD) being broken during dry storage.

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