Przewalskia tangutica Maxim. （Solanaceae： Przewalskia） is a perennial herbaceous plant, which is endemic to Tibet and is a rare and endangered Tibetan medicinal plant. In this paper, the morphological characteristi...Przewalskia tangutica Maxim. （Solanaceae： Przewalskia） is a perennial herbaceous plant, which is endemic to Tibet and is a rare and endangered Tibetan medicinal plant. In this paper, the morphological characteristics, seed germination, tissue culture, flower development characteristics, chemical composition, element content and resource characteristics of P. tangutica are summarized and analyzed. Combined with the survival status of P. tangutica, it is suggested that the research on ecological adaptation, survival mechanism, endangerment mechanism and eco- logical functions of P. tangutica should be strengthened.展开更多
Floral organogenesis and development of Przewalskia tangutica Maxim. endemic to China and Hyoscyamus niger L., which belong to the tribe Hyoscyameae (Solanaceae), were studied using scanning electron microscope. They ...Floral organogenesis and development of Przewalskia tangutica Maxim. endemic to China and Hyoscyamus niger L., which belong to the tribe Hyoscyameae (Solanaceae), were studied using scanning electron microscope. They have three common characters of floral organ initiation and development: 1) initiation of the floral organs in the two species follows Hofmeister's rule; 2) the mode of corolla tube development belongs to the 'late sympetaly' type; 3) primordia of the floral appendages initiated in a pentamerous pattern and acropetal order. But initiation of the calyx-lobe primordia showed different modes in these two species. The calyx-lobe primordia of H. niger have simultaneously whorled initiation, while those of P. tangutica have helical initiation, but the five calyx-lobe primordia form a ring after all five calyx-lobe primordia occur. The systematic significance of the present results in the genera Hyoscyamus and Przewalskia is discussed in this paper.展开更多
文摘Przewalskia tangutica Maxim. （Solanaceae： Przewalskia） is a perennial herbaceous plant, which is endemic to Tibet and is a rare and endangered Tibetan medicinal plant. In this paper, the morphological characteristics, seed germination, tissue culture, flower development characteristics, chemical composition, element content and resource characteristics of P. tangutica are summarized and analyzed. Combined with the survival status of P. tangutica, it is suggested that the research on ecological adaptation, survival mechanism, endangerment mechanism and eco- logical functions of P. tangutica should be strengthened.
文摘Floral organogenesis and development of Przewalskia tangutica Maxim. endemic to China and Hyoscyamus niger L., which belong to the tribe Hyoscyameae (Solanaceae), were studied using scanning electron microscope. They have three common characters of floral organ initiation and development: 1) initiation of the floral organs in the two species follows Hofmeister's rule; 2) the mode of corolla tube development belongs to the 'late sympetaly' type; 3) primordia of the floral appendages initiated in a pentamerous pattern and acropetal order. But initiation of the calyx-lobe primordia showed different modes in these two species. The calyx-lobe primordia of H. niger have simultaneously whorled initiation, while those of P. tangutica have helical initiation, but the five calyx-lobe primordia form a ring after all five calyx-lobe primordia occur. The systematic significance of the present results in the genera Hyoscyamus and Przewalskia is discussed in this paper.
