Topic
Gleichenia
About: Gleichenia is a research topic. Over the lifetime, 49 publications have been published within this topic receiving 553 citations.
Papers
TL;DR: There is further evidence to support the previous findings that certain epiphytic ferns do exhibit characteristics of CAM plants and diurnal changes in titratable acidity of Drymoglossum, Pyrrosia, and Kalanchoe were similar.
Abstract: Crassulacean acid metabolism (CAM) is known to occur in many succulent plant species (Ranson & Thomas 1960; Ting et al., 1972; Wolf, 1960). To date, more than 184 plant species have been reported to exhibit CAM features, but none of them are ferns (Szarek, pers. comm.). Recently we reported nocturnal assimilation of C02 by Drymoglossum piloselloides (L.) Presl, an epiphytic fern (Hew & Wong, 1974). This paper presents further evidence to support our previous findings that certain epiphytic ferns do exhibit characteristics of CAM plants. Two epiphytic ferns, Pyrrosia longifolia (Burm.) Morton and Drymoglossum piloselloides, were chosen for the present investigation. These ferns are found frequently on the lower part of Acacia tree trunks. Gleichenia linearis (Burm.) Clarke, a terrestial sun fern which has been shown to be a C3 plant (Hew & Wong, 1974), also was included in the study. All three ferns grow wild around the Nanyang University campus. For comparison purposes, the flowering plant Kalanchoe pinnata, a known CAM plant, was also used as experimental material. For 14C02 fixation studies and determination of titratable acidity, detached leaves or fronds were used; the method for 14C02 fixation has been described previously (Wong & Hew, 1973). Titratable acidity of plant tissues was determined as described by Szarek and Ting (1974), except the leaf or frond extract was titrated to a pH7 end point. Diffusive resistance of intact fronds or leaves were measured at three hour intervals using an Li-60 Diffusive Resistance Meter (LiCor Limited). Titratable Acidity.-The diurnal changes in titratable acidity of Drymoglossum, Pyrrosia, and Kalanchoe were similar (Figs. 1 -3). Titratable acidity decreased in the light, and at night the acidity increased. The magnitude of dark acidification in these three species was comparable to that previously reported (Bruinsma, 1958; McWilliams, 1970; Szarek & Ting, 1974). Among the three species, titratable acidity was highest in Kalanchoe, both in light and darkness. There was no significant difference in titratable acidity between the two ferns. In contrast, Gleichenia (Fig. 4), which is a C3 plant, shows no diurnal fluctuation in titratable acidity. Diffusive Resistance.-Changes in diffusive resistance patterns of intact Pyrrosia fronds (Fig. 5) and Kalanchoe leaves (Fig. 6) in the day and at night were similar, with high diffusive resistance in the day and low at night. The values for minimum diffusive resistance (5-15 secocm-1 ) and maximum diffusive resistance (100-120 sec*cm ) also were in agreement with that of other succulent plants (Szarek & Ting, 1974; Ting et al., 1972). From the changes in patterns, one could conclude that Pyrrosia and Drymoglossum stomata were closed in the day and open at night (Nishida, 1963; Ting et al., 1972). A point worth noting is that with the onset of darkness, an increase in diffusive resistance in both Pyrrosia and
55 citations
TL;DR: Guariguata et al. as discussed by the authors examined plant and soil responses to a fire on a fern-covered landslide in Puerto Rico to determine their relative importance in maintaining the fern thicket.
Abstract: Landslides are common in tropical mountains and occur in areas of high rainfall, steep slopes and unstable soils (Garwood et al. 1979). Landslides cover approximately 18 ha (0.1%) of the steep slopes of the Luquillo Experimental Forest (LEF) in eastern Puerto Rico (Guariguata 1990, Scatena & Larsen 1991) and are frequently associated with roads (Guariguata & Larsen 1989, Scatena & Larsen 1991). The annual precipitation in the LEF is 3450 mm and there is little seasonal variation (Brown et al. 1983). Ferns in the family Gleicheniaceae are the dominant vegetation on many landslides in the LEF, and Guariguata (1990) has suggested that these ferns may have a role in the development of vegetation on landslides. However, very little is known about the role of ferns in succession on landslides. Ferns form dense thickets in the LEF that are occasionally burned by road crews to maintain visibility along roadsides. This study examines plant and soil responses to a fire on a fern-covered landslide in Puerto Rico to determine their relative importance in maintaining the fern thicket. In April 1990, road crews burned one-half of a 650 m2 landslide (estimated age: 5-20 yr) on the western edge of the LEF. On 10 April 1990 (approximately 3-5 days after the fire), we sampled temperatures at noon at six randomly placed locations in the burned area and six adjacent unburned areas covered with two species of ferns in the Gleicheniaceae (Dicranopteris pectinata and Gleichenia bifida). Nomenclature follows Liogier and Martorell (1982). At each location, three measurements were taken from each of three levels: 5 cm depth, the
52 citations
1 Jun 2008
42 citations
1 Jun 2010
TL;DR: Continued international development of effective legislation and chemical and biological management of problem ferns will be required in order to contain their further spread which, in some cases, may be extensive and catastrophic.
Abstract: Key points 1. Despite the popular image of ferns as decorative, innocuous plants, certain fern species can become substantial problems where human activities disturb the natural equilibrium. Making the distinction between native and alien species helps us to understand how some ferns become problematic in the first place and how such problems can be managed. 2. About 60 species of ferns create problems for ecology and conservation in terrestrial and aquatic environments. Some of these ferns have significant negative impacts on human and animal health, food production and management of both land and water. 3. Where legislative or other preemptive controls fail, problem ferns need to be managed by timely and effective combinations of physical, chemical and biological methods. Researchers continue to improve methods of managing problem fern species in order to enhance efficacy and to minimize damage to nontarget vegetation and the local environment. 4. The full human, economic and environmental costs of problem ferns have not been investigated on a global basis. Continued international development of effective legislation and chemical and biological management of problem ferns will be required in order to contain their further spread which, in some cases, may be extensive and catastrophic. Introduction At least 60 fern species (see Table 8.1) have the proven or potential ability to occupy areas where they may create a variety of problems. The terrestrial ferns in this group can disrupt local ecosystems, conservation efforts, wildlife management and the productivity of land (including grazing lands, certain crops and forestry).
39 citations
TL;DR: Plastid-dividing rings (PDs) are described for the first time in the ferns for the occurrence of multiple PDs in the giant plastids found in up to 30% of vascular parenchyma cells may be associated with organelle fusion rather than division.
38 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2020 | 2 |
| 2018 | 3 |
| 2017 | 1 |
| 2015 | 1 |
| 2014 | 1 |