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1.
Photosynthetic characteristics, specific leaf mass, chlorophyll and total leaf nitrogen concentrations of four herbaceous
plants (Dicranopteris linearis, Hanguana malayana, Pentaphragma ellipticum, Tacca integrifolia) from nutrient-poor tropical
forests showed that all these plants were well-adapted to their natural growth environments. No photoinhibition was observed
even in the understorey plants.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
2.
Axenic cultures of Trentepohlia species are necessary for the study of growth and hysiological characters of the algae. We describe the use of a Sherman micromanipulator to isolate filaments from samples of T. aurea and T. odorata collected from their natural habitats. These filaments were then used as inocula for the establishment of axenic cultures. In the case of T. aurea, further treatment with lactic acid was necessary. 相似文献
3.
Photosynthetic characteristics, specific leaf mass, chlorophyll and total leaf nitrogen concentrations of four herbaceous plants (Dicranopteris linearis, Hanguana malayana, Pentaphragma ellipticum, Tacca integrifolia) from nutrient-poor tropical forests showed that all these plants were well-adapted to their natural growth environments. No photoinhibition was observed even in the understorey plants. 相似文献
4.
Boon-Sin Tay Bee-Lian Ong Prakash P. Kumar 《In vitro cellular & developmental biology. Plant》2000,36(2):118-124
Summary Shoot cultures of Hedyotis corymbosa, a C3 species, and sugarcane, a C4 species, were used to examine the effects of various CO2 concentrations and two light intensities on growth and photosynthetic rates. The fresh and dry weights of new growth of Hedyotis shoots were higher when grown under the higher light intensity, while differences among shoots grown under different CO2 levels were marginal. After 14 d of growth in various CO2 concentrations, no significant differences could be observed in the newly produced leaves of Hedyotis with respect to stomatal distribution and number of mesophyll cell layers. Shoots grown under high light intensity did not
show higher rates of photosynthesis than those grown under low light intensity. Also, sugarcane shoots grown in a CO2-enriched environment did not have higher photosynthetic rates, perhaps because the C4 pathway is less sensitive to the ambient
CO2 concentration. The quantum yield of Hedyotis shoots grown on medium with 20 g l−1 sucrose was lower than that of shoots on lower sucrose concentrations, supporting the view that photosynthesis is inhibited
by high levels of sucrose. Our results suggest that Hedyotis shoots in culture exhibit some form of acclimation to high CO2. so that there is no net gain in productivity by photosynthesis. 相似文献
5.
Tolerance of gametophytes of Acrostichum aureum to NaCl and dehydration was investigated under controlled conditions following the changes in chlorophyll fluorescence parameters (Fv/Fm, qP, qN). Salt tolerance was increased by growing gametophytes in low concentrations of NaCl. However, such treatment could not increase the tolerance of gametophytes to dehydration. Under water stress, a decrease in photochemical quenching (qP) was accompanied by an increase in non-photochemical quenching (qN). Under salt stress, qP also decreased, but qN did not change significantly in salt-hardened gametophytes. 相似文献
6.
Effects of CO2 on growth and photosynthesis of Pyrrosia piloselloides (L.) Price gametophytes 总被引:2,自引:0,他引:2
The effects of CO2 concentration on spore germination, growth, and net photosynthetic rate (PN) of gametophytes of a tropical epiphytic fern, Pyrrosia piloselloides, were investigated over a 100-d period. Increasing CO2 concentration stimulated spore germination and enhanced gametophytic growth. The appearance of sexual organs and formation of sporophytes were accelerated with higher CO2 during growth. Radiant energy saturated PN and dark respiration rate also increased with increasing CO2 concentrations during growth. 相似文献
7.
Tolerance of gametophytes of Acrostichum aureum to NaCl and dehydration was investigated under controlled conditions following
the changes in chlorophyll fluorescence parameters (Fv/Fm, qP, qN). Salt tolerance was increased by growing gametophytes in
low concentrations of NaCl. However, such treatment could not increase the tolerance of gametophytes to dehydration. Under
water stress, a decrease in photochemical quenching (qP) was accompanied by an increase in non-photochemical quenching (qN).
Under salt stress, qP also decreased, but qN did not change significantly in salt-hardened gametophytes.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
8.
Effect of Radiation Quality on Growth and Photosynthesis of Acacia mangium Seedlings 总被引:1,自引:0,他引:1
Radiation quality was an important environmental cue to stimulate seed germination in Acacia mangium. The photo-synthetic CO2 assimilation rate, dark respiration rate, total biomass, and relative growth rate of seedlings grown under monochromatic radiation were significantly lower than those of seedlings grown under full spectrum radiation. Blue and red radiation induced shade-avoidance and shade-tolerant responses of A. mangium seedlings, respectively. 相似文献
9.
The photosynthetic and growth responses of A. mangium to different photosynthetic photon flux density (PPFD) during early seedling establishment (36 d after sowing) were investigated. Shade-grown A. mangium seedlings exhibited lower chlorophyll (Chl) a/b ratio, higher Chl and carotenoid (Car) contents, and higher total Chl/Car ratio than sun-grown seedlings. Sun-grown seedlings showed significantly higher photosynthetic capacity and total plant dry mass. High PPFD was crucial for the successful early establishment and robust growth of A. mangium seedlings. 相似文献
10.
The optimum temperature for photosynthetic CO2 assimilation of A. mangium phyllodes was 30–32 °C. Photosystem 2 (PS 2) exhibited high tolerance to high temperature. Gas exchange and the function of PS2 of A. mangium were adapted to the temperature regime of the tropical environment and this might be the contributing factor to their fast growth under tropical conditions. 相似文献