FLORAL SYNDROME AND BREEDING SYSTEM OF THE ENDANGERED PLANT DISANTHUS CERCIDIFOLIUS MAXIM. VAR. LONGIPES

The endangered plant species, Rutidosis leptorrhynchoides (button wrinklewort), is now known from only a few populations in each of two regions separated by approximately 500 km in south-eastern Australia. Plants were examined from several populations from each region. No differences in chromosome number or morphology were observed among plants or populations. All counts were diploid, 2n = 26. Viable progeny were obtained following self-pollination and allozyme analysis indicated that these progeny were the result of selfing and not agamospermy. This species is not an obligate outcrosser and does not have a classical pre-zygotic self-incompatibility system. However, outcross pollen may have an advantage over self pollen and this species may thus be preferentially outcrossing. The pollen: ovule ratios (mean 3186 ± 48.5) were consistent with this hypothesis. Allele frequencies at allozyme loci diferred little between populations, with an estimated 97% of the variation within populations. There was no correlation between genetic distance and geographic distance. In contrast, for the leaf dimensions of plants germinated and raised together in a glasshouse there were differences between plants from the two regions. It is recommended that populations from both regions should be conserved.

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Floral syndrome and breeding system of Corydalis edulis

China Journal of Chinese Materia Medica ◽

10.4268/cjcmm20120905 ◽

2012 ◽

Author(s):

XIA Qing

Keyword(s):

Breeding System ◽

Floral Syndrome

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Breeding system and inbreeding depression in a translocated population of the endangered plant Dianthus morisianus (Caryophyllaceae)

Flora ◽

10.1016/j.flora.2019.151488 ◽

2020 ◽

Vol 262 ◽

pp. 151488 ◽

Cited By ~ 1

Author(s):

Anna Nebot ◽

Donatella Cogoni ◽

Giuseppe Fenu ◽

Gianluigi Bacchetta

Keyword(s):

Inbreeding Depression ◽

Breeding System ◽

Endangered Plant

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The breeding system and reproductive ecology of the endangered plant Fagopyrum dibotrys (D. Don) Hara

Bangladesh Journal of Botany ◽

10.3329/bjb.v43i2.21673 ◽

2015 ◽

Vol 43 (2) ◽

pp. 197-205 ◽

Cited By ~ 3

Author(s):

Ming-Lin Chen ◽

Ya-Li You ◽

Hui-Hui Wen ◽

Ying Li

Keyword(s):

Population Size ◽

Breeding System ◽

Pollen Size ◽

Endangered Plant ◽

Seed Setting ◽

Style Length ◽

Pollen Surface ◽

Flower Diameter ◽

Surface Ornamentation ◽

Morph Ratios

Distyly has been confirmed in Fagopyrum dibotrys (D. Don) Hara. The species are dimorphic in style length, anther height, pollen size and number but not in flower diameter, pollen surface ornamentation and stigma papilla cells. In F. dibotrys populations, style-morph ratios vary from isoplethy (1L : 1S) to strongly L-biased, or they more often contain only the L-morph. Moreover, it was found that larger isoplethic populations of F. dibotrys could produce more seeds than smaller single-morph populations. F. dibotrys had a smaller population size, morph-biased populations, and lower seed setting, which could be the reasons for the decrease in its population DOI: http://dx.doi.org/10.3329/bjb.v43i2.21673 Bangladesh J. Bot. 43(2): 197-205, 2014 (September)

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Seed dormancy and germination requirements in Angelica palustris (Besser) Hofm., a critically endangered plant

Bangladesh Journal of Botany ◽

10.3329/bjb.v44i4.38597 ◽

2018 ◽

Vol 44 (4) ◽

pp. 605-611

Author(s):

Anca Manole ◽

Cristian Banciu

Keyword(s):

Endangered Plant ◽

Seed Length ◽

Maturation Period ◽

Morphophysiological Dormancy ◽

Whole Seed ◽

Air Cavities ◽

Germination Indices ◽

Essential Oil Production ◽

Germination Requirements ◽

Seed Dormancy And Germination

The phenology of Angelica palustris seeds including maturation, germination requirements, and dormancy class, is still unknown. In opposite to the results reported from other species of Angelica, present findings showed that A. palustris produced seeds with embryo underdeveloped (the ratio between the embryo and the whole seed length was between 0.19 and 0.12) and physiologically dormant which corresponded to Morphophysiological Dormancy class. Dormancy breakdown requires a post maturation period (at least 30 days) at 18 - 20ºC for a complete embryo development, and also up to 30 days of cold stratification at 4°C. The best germination indices were obtained when fruit was removed. Germination energy (Ge) was achieved within 19 days after imbibition and was 25.8 + 0.03 and germination per cent (Gp) was achieved within 28 days and was 64.7 + 0.14. Fruit structure (lateral wings with air cavities) and physiology (essential oil production) are adaptations to facilitate seed dispersal and dormancy/germination balance.

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