Influence of Endocarp Thickness on Rose Achene Germination: Genetic and Environmental Factors

Gudin, S.; Aréne, Laurence; Chavagnat, A.; Bulard, C.

doi:10.21273/hortsci.25.7.786

Cited by 28 publications

(21 citation statements)

References 15 publications

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“…Thus, a thick pericarp was the most important trait regulating the elevational pattern of the level of dormancy; achene mass, achene size and embryo width had a comparatively small effect. Similar results were reported in that achenes of R. hybrida that matured at lower temperatures had thicker pericarp (Gudin et al 1990).…”

Section: Variation Of the Level Of Dormancy Along The Elevational Grasupporting

confidence: 86%

Changes in seed dormancy ofRosa multibracteataHemsl. & E. H. Wilson with increasing elevation in an arid valley in the eastern Tibetan Plateau

Zhou

Bao

2014

Ecological Research

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Variations in levels of seed dormancy among conspecific populations are poorly understood. We aim to determine the variations in the level of dormancy in Rosa multibracteata along an elevational gradient, and to analyze the mechanisms underlying seed dormancy. The study was conducted in an arid valley in the eastern Tibetan Plateau at five elevations: 1700, 1900, 2100, 2300 and 2500 m. Achene traits were measured and physiological levels of dormancy were determined by measuring germination percentages of achenes treated with H 2 SO 4 scarification, warm stratification and cold stratification and combinations of those treatments. Achene size, mass and pericarp thickness increased with increasing elevation, but embryo width decreased with increasing in the arid valley. The level of dormancy generally increased with increasing elevation. The level of dormancy of the rose achenes is intermediate from sites at elevations of 1700, 1900 and 2100 m and deep at elevations of 2300 and 2500 m. Comprehensive analysis suggests that the elevational pattern of level of seed dormancy could be ascribed to intrinsically thicker pericarp and deeper physiological dormancy in the embryo, and extrinsically decreased temperature, increased precipitation and soil moisture at the higher elevations. The great variations of achene traits and levels of seed dormancy across elevations suggest a phenotypic differentiation exists within this rose species. Thus, habitat conditions and achene traits should be considered when selecting roses as materials used to propagate seedlings for ornamental purposes or plant restoration.

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Section: Variation Of the Level Of Dormancy Along The Elevational Grasupporting

confidence: 86%

Changes in seed dormancy ofRosa multibracteataHemsl. & E. H. Wilson with increasing elevation in an arid valley in the eastern Tibetan Plateau

Zhou

Bao

2014

Ecological Research

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“…In cross I, 70% of the hips still remained on the plants after six weeks (when the embryos were isolated), and only 20% after seven weeks. As already reported (Gudin et al, 1990), the smallest visible embryos were 0.2 mm long, as measured by our method (binocular lens, magnification x 20). At this size, all embryos were already heart-shaped (for embryo development stage definitions see Pechoutre, 1902;Dudits et al, 1991).…”

Section: Ovule and Embryo Culturesupporting

confidence: 81%

“…On the same day in June 1989 two crosses between two cultivars of Rosa hybrida L. were carried out in a greenhouse at Selection Meilland (Antibes) as described by Gudin et al (1990). The first cross, cv Jelrafloki x cv 380-73-P (cross I), was known to be very difficult because of considerable early hip abscision, while the second one, cv 272-69-A × cv 255-75-A43 (cross II), was considered impossible because of total early hip abscision.…”

Section: Plant Materialsmentioning

confidence: 99%

“…The ovary content was extracted and the fertilized ovules, recognizable by their ovary dimensions (Gudin et al, 1990), were dissected under a Wild Leitz M3 binocular lens equipped with a micrometer eye piece. When an embryo was visible, its length was measured from radicular end to cotyledon extremities.…”

Section: Hip Abscisionmentioning

confidence: 99%

“…m -2. s -1 (Mazdafluor B6 TF 'P'/CFT tubes) with a photoperiod of 16 hr. months (Gudin et al, 1990), Fig. 1 shows that none could be collected in cross II while only those of two hips (resulting from 100 pollinated flowers) could be collected in cross I.…”

Section: Ovule and Embryo Culturementioning

confidence: 99%

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Embryo rescue in Rosa hybrida L.

Gudin¹

1993

Euphytica

Self Cite

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Two crosses between Rosa hybrida L. cultivars, that fail to produce progenies by conventional means, were carried out. In one of them, total hip abscision occured seven weeks after pollination; in the other one, only 2 % of the fertilized hips remained on the plants after eleven weeks. Four-and five-week-old fertilized ovules were isolated in the first cross and six-week-old embryos in the second. The ovules were cultured on six media which differed in their mineral salt and sucrose concentrations while the embryos were cultured on only one of these media and eventually cold treated for one month at 4 ° C before being placed in a culture room set at 23 ° C. The embryos that had been isolated in ovulo when they were still not visible under a binocular lens developed atypically. The embryos isolated in ovulo when they were heart-shaped and on average 0.27 mm long performed in ovulo germination on some media and/or enlargement on all of them after two weeks; after another two week culture, once isolated from the ovule, all of them germinated. The cultured isolated embryos, that were exposed to cold, enlarged and germinated more rapidly when placed at 23 ° C than those not exposed to cold. Furthermore, the plantlets resulting from untreated embryo germination were characterized by large cotyledons which were only partially green. These results are discussed in regard to embryogenesis, precocious germination and dormancy.

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Rose: Genetics and Breeding

Gudin

1999

Plant Breeding Reviews

116

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Influence of Endocarp Thickness on Rose Achene Germination: Genetic and Environmental Factors

Cited by 28 publications

References 15 publications

Changes in seed dormancy ofRosa multibracteataHemsl. & E. H. Wilson with increasing elevation in an arid valley in the eastern Tibetan Plateau

Changes in seed dormancy ofRosa multibracteataHemsl. & E. H. Wilson with increasing elevation in an arid valley in the eastern Tibetan Plateau

Embryo rescue in Rosa hybrida L.

Rose: Genetics and Breeding

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