Delayed Selfing in an Alpine Biennial Gentianopsis paludosa (Gentianaceae) in the Qinghai-Tibetan Plateau

	Delayed Selfing in an Alpine Biennial Gentianopsis paludosa (Gentianaceae) in the Qinghai-Tibetan Plateau
	Duan, Yuan-Wen ; Dafni, Amots ; Hou, Qin-Zheng ; He, Ya-Ping ; Liu, Jian-Quan
刊名	JOURNAL OF INTEGRATIVE PLANT BIOLOGY ; Duan, YW; Dafni, A; Hou, QZ; He, YP; Liu, JQ.Delayed Selfing in an Alpine Biennial Gentianopsis paludosa (Gentianaceae) in the Qinghai-Tibetan Plateau,JOURNAL OF INTEGRATIVE PLANT BIOLOGY,2010,52(6):593-599
	2010-06-01
英文摘要	Delayed selfing could provide ovules with an opportunity to be fertilized as a means of "pollination assurance" before the flowers wilt. It could, thus, be regarded as an adaptation to unpredictable pollinator environments. Within the alpine biennial Gentianopsis paludosa, the showy flowers and herkogamy at the early stage of a flower's life cycle may favor outcrossing. As the flower ages, anthers contact the central stigma due to the elongation of all filaments, resulting in autonomous selfing. Flower visitors are extremely rare in a high altitude population; and examination of the mating system indicates that G. paludosa is self-pollinated under natural conditions in this population. While at the lower altitude, the bumblebee visitation rate is relatively high but possibly unreliable. Stigma receptivity is the highest on the third day of anthesis, and decreases thereafter. Pollen viability is the highest when flowers open, and gradually decreases later. Self-pollination of G. paludosa occurs at the late stage of a flower's lifecycle when stigma receptivity and pollen viability have both decreased, suggesting delayed selfing and assurance of seed production. This delayed selfing could assure seed production under the constraints of pollinator scarcity, but ensure outcrossing when pollinators were available. Such a flexible pollination mechanism is highly adaptive in the alpine environment of the Qinghai-Tibetan Plateau.; Delayed selfing could provide ovules with an opportunity to be fertilized as a means of "pollination assurance" before the flowers wilt. It could, thus, be regarded as an adaptation to unpredictable pollinator environments. Within the alpine biennial Gentianopsis paludosa, the showy flowers and herkogamy at the early stage of a flower's life cycle may favor outcrossing. As the flower ages, anthers contact the central stigma due to the elongation of all filaments, resulting in autonomous selfing. Flower visitors are extremely rare in a high altitude population; and examination of the mating system indicates that G. paludosa is self-pollinated under natural conditions in this population. While at the lower altitude, the bumblebee visitation rate is relatively high but possibly unreliable. Stigma receptivity is the highest on the third day of anthesis, and decreases thereafter. Pollen viability is the highest when flowers open, and gradually decreases later. Self-pollination of G. paludosa occurs at the late stage of a flower's lifecycle when stigma receptivity and pollen viability have both decreased, suggesting delayed selfing and assurance of seed production. This delayed selfing could assure seed production under the constraints of pollinator scarcity, but ensure outcrossing when pollinators were available. Such a flexible pollination mechanism is highly adaptive in the alpine environment of the Qinghai-Tibetan Plateau.
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn//handle/363003/1684]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Duan, Yuan-Wen,Dafni, Amots,Hou, Qin-Zheng,et al. Delayed Selfing in an Alpine Biennial Gentianopsis paludosa (Gentianaceae) in the Qinghai-Tibetan Plateau[J]. JOURNAL OF INTEGRATIVE PLANT BIOLOGY, Duan, YW; Dafni, A; Hou, QZ; He, YP; Liu, JQ.Delayed Selfing in an Alpine Biennial Gentianopsis paludosa (Gentianaceae) in the Qinghai-Tibetan Plateau,JOURNAL OF INTEGRATIVE PLANT BIOLOGY,2010,52(6):593-599,2010.
APA	Duan, Yuan-Wen,Dafni, Amots,Hou, Qin-Zheng,He, Ya-Ping,&Liu, Jian-Quan.(2010).Delayed Selfing in an Alpine Biennial Gentianopsis paludosa (Gentianaceae) in the Qinghai-Tibetan Plateau.JOURNAL OF INTEGRATIVE PLANT BIOLOGY.
MLA	Duan, Yuan-Wen,et al."Delayed Selfing in an Alpine Biennial Gentianopsis paludosa (Gentianaceae) in the Qinghai-Tibetan Plateau".JOURNAL OF INTEGRATIVE PLANT BIOLOGY (2010).