Desiccation Intolerance in Seeds of Zizania palustris is Not Related to Developmental Age or the Duration of Post-harvest Storage

Probert, R. J.; Brierley, Ewen R

doi:10.1093/oxfordjournals.aob.a087892

Cited by 23 publications

(21 citation statements)

References 8 publications

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“…2d). Probert & Brierley (1989) and Probert & Longley (1989) working with several recalcitrant aquatic grasses have shown similar responses of seed germination to desiccation as that shown here for sycamore in Figure 3. While it is possible that certain seeds may be able to tolerate greater desiccation than others, because in Figure 3 it can be seen that the desiccation tolerance of the populations can alter during development, we presume that the germination of a few sycamore seeds after desiccation to around 10% moisture content is more likely to have resulted from variation in moisture content among individuals such that the survivors had not been dried to the extent indicated by mean seed moisture content.…”

Section: Discussionsupporting

confidence: 66%

“…In orthodox seeds such as castor bean a comparatively small reduction in moisture content during development can enable germination to be induced (Kermode, Dumbroff & Bewley, 1989). Similarly, Probert & Brierley (1989) have reported that a small reduction in moisture content promoted germination in freshly-harvested seeds of the recalcitrant wild rice {Zizania palustris L.). Our results, therefore, suggest that the onset of germinability, and the switch in developmental processes required for this to occur, is triggered by a reduction in seed moisture content not only in orthodox seeds but also in recalcitrant seeds.…”

Section: Discussionmentioning

confidence: 91%

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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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Section: Discussionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 91%

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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“…Desiccation appears to play some role in the switch from the developmental process to that essential for germination (Bewley and Black 1994), and this is evident in P. serotina, where germination percentage has a significant and negative correlation with seed moisture content. Stimulation of germination by drying appears to be universal, since even in recalcitrant seeds a small reduction in moisture content has this effect (Probert and Brierly 1989). Thomsen (1997) reported a decline in mean germination time (including cold stratification time) with decreased moisture content in Fagus sylvatica as seeds matured.…”

Section: Discussionmentioning

confidence: 99%

Seed development and germination ecophysiology of the invasive tree Prunus serotina (Rosaceae) in a temperate forest in Western Europe

2009

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Seed development, dormancy and germination of the American invasive tree species, Prunus serotina, are described for plants growing in a large forest in Belgium. Seeds of P. serotina were collected following anthesis in the first week of July and thereafter at fortnightly intervals. Seed dormancy, temperature requirements for germination and the soil seed bank were investigated. At maturation (about 105 days after anthesis), seed moisture content had decreased to around 13.7%, and 44% of the seeds had attained the capacity to germinate. Mature seeds of P. serotina exhibited physiological dormancy, germinating only after a long cold, moist stratification period. Highest germination percentage occurred in seeds treated with gibberellic acid (GA 3 ), at 10°C. We found no evidence that P. serotina forms a persistent seed bank but noticed a persistent seedling bank in the field.

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“…However, there is not unanimity regarding the differential response of desiccation-sensitive seeds to drying rate. The findings of Probert and his colleagues who worked with aquatic grasses, and in particular Z. palustris, did not confirm that either differential drying rate or developmental status affected desiccation sensitivity of the seeds of the species they investigated (Probert and Longley 1989;Probert and Brierley 1989). However, as the rates of drying for Z. palustris were of different orders of magnitude and the level to which those seeds were dried was not stated, it is suggested that the work of those authors is not comparable to the investigations reported here or previously (Farrant et al 1988(Farrant et al , 1989Berjak et al 1990a).…”

Section: Introductionmentioning

confidence: 85%

Homoiohydrous (recalcitrant) seeds: Developmental status, desiccation sensitivity and the state of water in axes of Landolphia kirkii Dyer

Berjak

Pammenter

Vertucci³

1992

Planta

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The desiccation sensitivity in relation to the stage of development was investigated in embryonic axes from the homoiohydrous (recalcitrant) seeds of Landolphia kirkii. Electrolyte leakage, used to assess membrane damage after flash (very rapid) drying, indicated that axes from immature (non-germinable) seeds were the most desiccation-tolerant, followed by those from mature seeds, while axes from seeds germinated for increasing times were progressively more desiccation-sensitive. Differential scanning calorimetry was used to study the relationship between desiccation sensitivity and the properties of water in the tissues. Axes from immature seeds had a lower content of non-freezable water than that of any other developmental stage and a higher enthalpy of melting of freezable water. For mature and immature axes electrolyte leakage increased at the point of loss of freezable water. At other developmental stages the water content at which electrolyte leakage increased markedly correlated with the other properties of the water, such as the change in the shape of the melting endotherm and the onset temperature. Ultrastructural studies of axes at the various developmental stages showed changes in the degree and pattern of vacuolation, the presence and quantities of lipid and starch, and the degree of endomembrane development. The results are discussed in relation to current hypotheses on the basis of desiccation tolerance.

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Desiccation Intolerance in Seeds of Zizania palustris is Not Related to Developmental Age or the Duration of Post-harvest Storage

Cited by 23 publications

References 8 publications

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

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

Seed development and germination ecophysiology of the invasive tree Prunus serotina (Rosaceae) in a temperate forest in Western Europe

Homoiohydrous (recalcitrant) seeds: Developmental status, desiccation sensitivity and the state of water in axes of Landolphia kirkii Dyer

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