Arid
DOI10.1016/j.flora.2018.03.006
Seed development and germination of Strombocactus species (Cactaceae): A comparative morphological and anatomical study
Camacho-Velazquez, Aldebaran1; Arias, Salvador2; Garcia-Campusano, Florencia3; Sanchez-Martinez, Emiliano4; Vazquez-Santana, Sonia1
通讯作者Vazquez-Santana, Sonia
来源期刊FLORA
ISSN0367-2530
EISSN1618-0585
出版年2018
卷号242页码:89-101
英文摘要

Seed development, germination and seedling establishment were compared between Strombocactus species, S. corregidorae, S. disciformis ssp. disciformis and S. disciformis ssp. esperanzae, emphasizing the origin and role of the seed appendage, which is present only in both S. disciformis subspecies. The development and morpho-anatomy of both seeds and seedlings were evaluated using standard light microscopy and scanning electron microscopy. Embryo and seed development proceeded similarly in all three taxa. However, we unequivocally demonstrate the funicular origin and aerenchymatic structure of the seed appendage, the aril in S. disciformis ssp. disciformis and S. disciformis ssp. esperanzae, which differentiates soon after fertilization. Other distinguishing features include the delayed growth of the testa in the micropyle in S. corregidorae, and testa micromorphology in mature seeds. Seed potential and production were similar between species, although seed efficiency was higher in both subspecies of S. disciformis, which may reflect pollination problems in S. corregidorae natural populations. Seed flotation occurs in the three taxa, due to the presence of air spaces in the lumen of the seed coat cells and the aril aerenchymatic, when present. Neither physiological nor structural dormancy were detected in Strombocactus, and a high percentage of seeds germinated in the different taxa, as no scarification or disinfection treatments were necessary. The absence of the aril in S. corregidorae shows that further genetic, phylogenetic and comparative ontogenic studies that include the three taxa of Strombocactus and the nearest genera, such as Ariocarpus, Turbinicarpus and Epithelantha, are required in order to determine if this structure was gained or lost during evolution of Strombocactus. This research provides a greater understanding of the reproductive biology of this endangered genus endemic to Mexico, necessary for the establishment of future restoration and conservation programs.


英文关键词Aril Cactaceae Germination Seed appendage Seedling
类型Article
语种英语
国家Mexico
收录类别SCI-E
WOS记录号WOS:000430357600011
WOS关键词DISPERSAL ; PHYLOGENY ; ECOLOGY ; DESERT ; WATER ; ANTS
WOS类目Plant Sciences ; Ecology
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology
来源机构Universidad Nacional Autónoma de México
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/209288
作者单位1.Univ Nacl Autonoma Mexico, Fac Ciencias, Dept Biol Comparada, Lab Desarrollo Plantas, Mexico City 04510, DF, Mexico;
2.Univ Nacl Autonoma Mexico, Inst Biol, Jardin Bot, Mexico City 04510, DF, Mexico;
3.CENID COMEF, Inst Nacl Invest Forestales Agr & Pecuarias, Progreso 5, Mexico City 04010, DF, Mexico;
4.CONCYTEQ, Jardin Bot Reg Cadereyta Ingn, Cadereyta De Montes 76500, Queretaro, Mexico
推荐引用方式
GB/T 7714
Camacho-Velazquez, Aldebaran,Arias, Salvador,Garcia-Campusano, Florencia,et al. Seed development and germination of Strombocactus species (Cactaceae): A comparative morphological and anatomical study[J]. Universidad Nacional Autónoma de México,2018,242:89-101.
APA Camacho-Velazquez, Aldebaran,Arias, Salvador,Garcia-Campusano, Florencia,Sanchez-Martinez, Emiliano,&Vazquez-Santana, Sonia.(2018).Seed development and germination of Strombocactus species (Cactaceae): A comparative morphological and anatomical study.FLORA,242,89-101.
MLA Camacho-Velazquez, Aldebaran,et al."Seed development and germination of Strombocactus species (Cactaceae): A comparative morphological and anatomical study".FLORA 242(2018):89-101.
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