Desiccation studies in relation to the storage of <i>Araucaria</i> seed

Tompsett, P. B.

doi:10.1111/j.1744-7348.1984.tb03085.x

Cited by 64 publications

(40 citation statements)

References 3 publications

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“…Além da classificação fisiológica do comportamento das sementes durante a dessecação e no armazenamento, a origem, ocorrência (Roberts, 1973;Roberts e King, 1980;Bonner, 1990;Pammenter e Berjak, 2000), tipo de fruto, semente (Hong et al, 1996), classificação taxonômica (Hong et al, 1996), conteúdo de água no ponto de maturidade fisiológica (Hong et al, 1996e Davide et al, 2001, tamanho da semente e a combinação destas (Tompset, 1984), são características propostas para permitir o melhor entendimento das respostas fisiológicas e ecologia das espécies.…”

Section: Introductionunclassified

Classificação fisiológica de sementes de cinco espécies arbóreas de mata ciliar quanto a tolerância à dessecação e ao armazenamento

José¹,

Davide

2007

Rev. bras. sementes

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RESUMO -Sementes de cinco espécies florestais ocorrentes em matas ciliares da bacia do Rio Grande, no Estado de Minas Gerais, foram classificadas de acordo com a tolerância à dessecação e ao armazenamento, como forma de subsidiar futuros programas de propagação e conservação ex situ. (Myrtaceae), and Metrodorea stipularis Mart. (Rutaceae) were collected and taken to the seed laboratory where they were processed and submitted to drying, storage and evaluation of viability by the germination test. After physiological classification regarding storage behaviour it was observed that seeds of M. argyrophylla and M. stipularis presented orthodox behaviour. Such kind of seeds allow storage at low temperature (-20ºC) and moisture content (£5%), without harming viability. On the other hand, seeds of A. edulis, I. warmingii and M. venulosa were classified as recalcitrant, which did not tolerate moisture contents below 12%, indicating that in situ conservation should be used for preservation of the genetic resources of these species.

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Section: Introductionunclassified

Classificação fisiológica de sementes de cinco espécies arbóreas de mata ciliar quanto a tolerância à dessecação e ao armazenamento

José¹,

Davide

2007

Rev. bras. sementes

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“…Moreover, seed storage behaviour may difTer among species within a genus. For example, Tompsett (1982Tompsett ( , 1984 has shown that the large fleshy seeds of the species of Araucaria from South America are recalcitrant, whereas the smaller seeds of many Araucaria species from the Western Pacific are orthodox.…”

Section: Introductionmentioning

confidence: 99%

A comparison of maturation drying, germination, and desiccation tolerance between developing seeds of Acer pseudoplatanus L. and Acer platanoides L

Hong¹,

Ellis²

1990

New Phytologist

117

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SUMMARYDifferences in maturation drying and desiccation tolerance during seed development were detected between the two contrasting Acer spp., Norway maple (Acer platanoides L.), which shows orthodox seed storage behaviour, and sycamore (A. pseudoplatanus L.), which shows recalcitrant seed storage behaviour. In both species, the onset of germinability (150 d tests at 5 °C) occurred after percentage seed moisture content had begun to decline, but before net loss in seed moisture. The onset of germinability in Norway maple occurred 4 wk before physiological maturity (i.e. 4 wk before the end of the increase in seed dry matter), whereas in sycamore it occurred some ten weeks before physiological maturity when the seeds were only 60 % filled. Seeds of Norway maple were able to tolerate enforced rapid desiccation to 10% moisture content (f. wt) at physiological maturity, when maturationdrying had reduced seed moisture content to 54 %. Between 2 and 4 wk later seed moisture content rapidly declined naturally to 25 %, at which value the fruits were shed. In contrast, a constant rate of maturation-drying was observed in sycamore. The seeds were shed at 58 % moisture content and, in almost all cases, the seeds were intolerant of rapid desiccation to c. 10 % moisture content throughout seed development. A very small proportion of sycamore seeds did survive rapid desiccation when harvested between 6 September and 4 October, but no seeds survived desiccation to 5 % moisture content or below. A comparison of the germination of sycamore seeds harvested on four dates and dried to various moisture contents showed that the seeds tolerated greater desiccation as they matured between 12 July and 20 September, but there was no further change thereafter. The results are therefore compatible with previous classifications of seed storage behaviour in each species, and with the view that the initial decline in seed moisture content stimulates the developmental switch which results in the onset of germinability in both orthodox and recalcitrant seeds.

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“…Further desiccation leads to a quick reduction of viability. The point at which a rapid drop of viability starts to be observed is termed the 'critical moisture content' (King and Roberts, 1979) or 'lowest safe moisture content' (Tompsett, 1984). The point where viability is completely lost is called 'lethal moisture content ' (Hong and Ellis, 1992).…”

Section: G H 2 O (G Dry Matter)mentioning

confidence: 99%

Desiccation sensitivity and cell cycle aspects in seeds of Inga vera subsp. affinis

Faria

Lammeren

Hilhorst³

2004

Seed Sci. Res.

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The desiccation sensitivity of seeds of Inga vera Willd. subsp. affinis, a recalcitrant-seeded tree from Brazil, was analysed, focusing on water relations and cell-cycle aspects, including DNA content and the microtubular cytoskeleton.Seeds were collected at four developmental stages, dried to different moisture contents (MCs), assessed regarding water activity and set to germinate. Samples of fresh (non-dried) developing and mature seeds were used for assessment of DNA content by flow cytometry. Immunohistochemical detection of microtubules (MTs) was done in mature seeds at different MCs. Slight desiccation of immature seeds increased germination, but further drying resulted in a quick decline of germinability. During seed development the desiccation sensitivity decreased slightly, but DNA content of the embryonic axis cells remained constant, suggesting no relation between those two parameters. Embryonic axis cells of mature seeds showed abundant cortical microtubule arrays, which were not affected by mild desiccation, but broken down by further drying. It appeared that, upon rehydration, damaged cells were not able to reconstitute the microtubular cytoskeleton. The failure of germination of Inga vera seeds after drying could not be attributed to cellular damage to DNA synthesis and mitosis, since the radicle protruded by means of cell elongation, without a need for cell division. However, the breakdown of MTs during desiccation, and their subsequent inability to reassemble upon rehydration, may be related to the decreased germination, since MTs are required for cell elongation.

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Desiccation studies in relation to the storage of Araucaria seed

Cited by 64 publications

References 3 publications

Classificação fisiológica de sementes de cinco espécies arbóreas de mata ciliar quanto a tolerância à dessecação e ao armazenamento

Classificação fisiológica de sementes de cinco espécies arbóreas de mata ciliar quanto a tolerância à dessecação e ao armazenamento

A comparison of maturation drying, germination, and desiccation tolerance between developing seeds of Acer pseudoplatanus L. and Acer platanoides L

Desiccation sensitivity and cell cycle aspects in seeds of Inga vera subsp. affinis

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