Changes in gas exchange and chlorophyll fluorescence characteristics of two mangroves and a mangrove associate in response to salinity in the natural environment

Trees ◽  
2001 ◽  
Vol 16 (2-3) ◽  
pp. 140-146 ◽  
Author(s):  
Gonasageran Naidoo ◽  
Arnd V. Tuffers ◽  
Dieter J. von Willert
Keyword(s):  
Chlorophyll Fluorescence ◽  
Gas Exchange ◽  
Natural Environment ◽  
Chlorophyll Fluorescence Characteristics ◽  
Fluorescence Characteristics ◽  
Mangrove Associate

scholarly journals Drought, Leaf Gas Exchange, and Chlorophyll Fluorescence of Field-grown Papaya

1998 ◽  
Vol 123 (4) ◽  
pp. 714-718 ◽  
Author(s):  
Thomas E. Marler ◽  
Michael V. Mickelbart
Keyword(s):  
Chlorophyll Fluorescence ◽  
Drought Stress ◽  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Time Of Day ◽  
Photon Flux ◽  
Published Data ◽  
Light Saturation ◽  
Chlorophyll Fluorescence Characteristics ◽  
Fluorescence Characteristics

The influence of drought stress on leaf gas exchange and chlorophyll fluorescence characteristics of field-grown papaya (Carica papaya L.) plants was determined under a range of incident light fluxes and times of day. These data may aid in improving management systems for papaya production which minimize detrimental effects from suboptimal environmental conditions. Water was withheld from field-grown `Red Lady' plants in one study and `Tainung #2', `Red Lady', and `Sunrise' plants in a second study until soil matric potential was -60 to -70 kPa. Drought-stressed plants exhibited reduced net CO2 assimilation (ACO2) above light saturation, photosynthetic photon flux (PPF) at which light saturation for ACO2 occurred, and apparent quantum yield compared to well-watered plants. The light compensation point of drought-stressed plants was greater than that of well-watered plants. Leaf chlorophyll fluorescence characteristics were not influenced by drought stress. The daily pattern of leaf gas exchange was dependent on climatic conditions. For sunny days, ACO2, stomatal conductance of water (gs), and water use efficiency of well-watered plants were maximal at mid-morning, declined during midday, and then partially recovered during late afternoon. In drought-stressed plants, leaf gas exchange was relatively constant after a brief early morning maximum. On overcast days, the responses of gas exchange variables in relation to time of day followed smooth bell-shaped patterns regardless of the level of drought stress. Combined with previously published data, these results indicate that the influence of drought stress on gas exchange is highly dependent on time of day, ambient sky conditions, plant size, and speed with which drought stress occurs.

Analysis of the Chlorophyll Fluorescence Characteristics and Tolerance Ability of Taiwan Protophyte with Ozone Gas Exposure

2013 ◽  
Vol 726-731 ◽  
pp. 3908-3911
Author(s):  
Chung Yi Chung ◽  
Pei Ling Chung ◽  
Hwa Sheng Gau ◽  
Wen Liang Lai ◽  
Shao Wei Liao ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Industrial Area ◽  
Chlorophyll Fluorescence Characteristics ◽  
Custom Made ◽  
Fluorescence Characteristics ◽  
Millettia Pinnata ◽  
In Series ◽  
Growing Environment ◽  
Cerbera Manghas ◽  
Gas Exposure

Plants could make the environment beauty and improve air quality. But the plants need adapt to the growing environment. In the industrial area or cities, ozone (O3) is a common pollutant; it could hurt human health and hinder the plants growth . This research used a custom-made fumigation equipment to evaluate the tolerance ability of 7 species of Taiwan protophyte with 200, 400 and 800 ppb O3gas exposure. The results of this research showed that among all tested trees,Aglaia formosanaandCerbera manghashad the strongest tolerance to O3and then theMillettia pinnataandPalaquium formosanum,Nageia nagi,Terminalia catappain series, theTournefortia argenteawas the least.

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