干旱区生态环境知识资源中心(Arid): Population structure and reproductive biology of peyote (Lophophora diffusa, Cactaceae), a threatened species with pollen limitation

Arid

DOI	10.3159/TORREY-D-18-00055.1
	Population structure and reproductive biology of peyote (Lophophora diffusa, Cactaceae), a threatened species with pollen limitation
	Isabel Briseno-Sanchez, Maria; Martinez-Peralta, Concepcion; Mandujano, Maria C.
通讯作者	Mandujano, MC (corresponding author), Univ Nacl Autonoma Mexico, Dept Ecol Biodiversidad, Lab Genet & Ecol, Inst Ecol, Apartado Postal 70-275, Ciudad De Mexico 04510, Cdmx, Mexico.
来源期刊	JOURNAL OF THE TORREY BOTANICAL SOCIETY
ISSN	1095-5674
EISSN	1940-0616
出版年	2020
卷号	147 期号:3 页码:243-257
英文摘要	Threatened species frequently have a J-shaped population structure, which indicates a reduction in seed set and poor or nonexistent recruitment. Altered population structures may be due to disrupted demographic processes that result in low reproductive success or small population size. Peyote-Lophophora diffu.sa Croizat (Bravo)-is a rare, threatened cactus species that is subject to overcxploitation because of psychedelic tourism and medicinal and religious uses that decrease its effective population size. We analyzed peyote population structure and identified attributes of its reproductive biology that may limit population persistence. The population's size structure (based on plant size in square centimeters) was determined by census in 2014 and 2015 (n = 420 individuals). Determination of the breeding system of peyote was based on floral morphology and evaluation of herkogamy, dichogamy, and pollen/ovule ratio, and controlled pollination experiments were used to determine the outcrossing rate and whether the species was pollen limited. Additionally, behavior and frequency of floral visitors were recorded to establish the pollinator guild. Peyote's population structure showed the presence of seedlings, juveniles, and adults in both years, indicating some recruitment and low adult mortality. Flowers were herkogamous, homogamous, and diurnal, with a 2-day longevity and high pollen/ovule ratios. These floral traits suggest that peyote is xenogamous, and pollination experiments indicated that it is a facultative outcrossing species, which needs pollinators to set fruit. The time of pistil receptivity coincided with the maximum activity of floral visitors (small solitary bees and small beetles) searching for floral rewards. Evidence indicates that peyote has an outcrossing system with partial self-incompatibility and is pollen limited. Positive factors, such as moderate seedling recruitment, a similar population structure during the two study periods, and a large number of reproductive individuals (close to 50%), indicate natural regeneration and increase the likelihood of population persistence. However, low fruit set and strong dependence upon efficient pollinators reduce reproductive success and increase species vulnerability.
英文关键词	breeding system floral visitors herkogamy population persistence reproductive success
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000599331300004
WOS关键词	COLUMNAR CACTUS ; TEHUACAN VALLEY ; INBREEDING DEPRESSION ; SELF-INCOMPATIBILITY ; DEMOGRAPHIC-ANALYSIS ; POLLINATION BIOLOGY ; PLANT REPRODUCTION ; CHIHUAHUAN DESERT ; OPUNTIA-RASTRERA ; BREEDING SYSTEMS
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
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/2XILL650/349055
作者单位	[Isabel Briseno-Sanchez, Maria; Mandujano, Maria C.] Univ Nacl Autonoma Mexico, Dept Ecol Biodiversidad, Lab Genet & Ecol, Inst Ecol, Apartado Postal 70-275, Ciudad De Mexico 04510, Cdmx, Mexico; [Martinez-Peralta, Concepcion] Univ Autonoma Estado Morelos, Escuela Estudios Super Jicarero, Jojutla 62909, Morelos, Mexico
推荐引用方式 GB/T 7714	Isabel Briseno-Sanchez, Maria,Martinez-Peralta, Concepcion,Mandujano, Maria C.. Population structure and reproductive biology of peyote (Lophophora diffusa, Cactaceae), a threatened species with pollen limitation[J]. Universidad Nacional Autónoma de México,2020,147(3):243-257.
APA	Isabel Briseno-Sanchez, Maria,Martinez-Peralta, Concepcion,&Mandujano, Maria C..(2020).Population structure and reproductive biology of peyote (Lophophora diffusa, Cactaceae), a threatened species with pollen limitation.JOURNAL OF THE TORREY BOTANICAL SOCIETY,147(3),243-257.
MLA	Isabel Briseno-Sanchez, Maria,et al."Population structure and reproductive biology of peyote (Lophophora diffusa, Cactaceae), a threatened species with pollen limitation".JOURNAL OF THE TORREY BOTANICAL SOCIETY 147.3(2020):243-257.