Continuous Chlorophyll Fluorescence and Gas Exchange Measurements as A New Approach to Study Water Stress Effects on Leaf Photosynthesis

1998 ◽  
pp. 4305-4308 ◽  
Author(s):  
Jaume Flexas ◽  
Jean-Marie Briantais ◽  
Zoran Cerovic ◽  
Hipólito Medranol ◽  
Ismael Moya
Keyword(s):  
Chlorophyll Fluorescence ◽  
Water Stress ◽  
Gas Exchange ◽  
Leaf Photosynthesis ◽  
New Approach ◽  
Stress Effects

scholarly journals Short-Time of Rehydration is not Effective to Re-Establish Chlorophyll Fluorescence and Gas Exchange in Two Cowpea Cultivars Submitted to Water Deficit

2017 ◽  
Vol 45 (1) ◽  
pp. 238-244 ◽  
Author(s):  
Udson de Oliveira BARROS JUNIOR ◽  
Maria Antonia Machado BARBOSA ◽  
Michael Douglas Roque LIMA ◽  
Gélia Dinah Monteiro VIANA ◽  
Allan Klynger da Silva LOBATO
Keyword(s):  
Chlorophyll Fluorescence ◽  
Water Stress ◽  
Gas Exchange ◽  
Water Supply ◽  
Water Deficit ◽  
Water Restriction ◽  
Cowpea Cultivars ◽  
The Third ◽  
Short Time

Low water supply frequently interferes on chlorophyll fluorescence and gas exchange. This study aimed to answer if a short-time of rehydration is efficient to re-establish chlorophyll fluorescence and gas exchange in cowpea plants. The experiment used four treatments (sensitive / water deficit, sensitive / control, tolerant / water deficit and tolerant / control). The sensitive and tolerant cultivars after water restriction had significant changes in gas exchange. On the third day, the stress caused lower for PN and gs in sensitive cultivar of 67% and 45%, respectively. After rehydration these parameters were not recovered significantly to two cultivars. In relation to chlorophyll fluorescence, water stress caused significant changes in all parameters evaluated of cultivars, being observed effects more intense on sensitive cultivar in the parameters Fv/Fm (38%) and Fo (69%). Rehydration did not promote recovery of the values of Fv/Fm and Fo to sensitive cultivar. Therefore, our study revealed that a short-time of rehydration is not effective to re-establish chlorophyll fluorescence and gas exchange in cowpea plants submitted to water deficit.

scholarly journals Effects of elevated CO2 and water stress on the adaptation of stomata and gas exchange in leaves of eggplants (Solanum melongena L.)

1970 ◽  
Vol 40 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Bikash C Sarker ◽  
Michihiro Hara
Keyword(s):  
Water Stress ◽  
Gas Exchange ◽  
Elevated Co2 ◽  
Stomatal Density ◽  
Solanum Melongena ◽  
Stress Adaptation ◽  
Leaf Photosynthesis ◽  
Stomatal Morphology ◽  
Stomatal Length ◽  
Ambient Co2

Effects and possible interaction of elevated CO2 and water stress on the stomatal morphology and the pattern of gas exchange in leaves of eggplants (Solanum melongena L. cv. Senryo No. 2) were investigated. Sedlings were grown to maturity in controlled growth chamber using ambient CO2 (365~370 ppm) and elevated CO2 (700 ppm) and at frequent watering as control and watering after every 21 days for simulating periodic water stress and recovery from stress. A complementary acclimatisation of photosynthesis in water stressed eggplants grown under elevated CO2 was evident. Despite decreased stomatal conductance and transpiration rate under elevated CO2 conditions, increased net leaf photosynthesis rate was observed. Stomatal length and width decreased under water stress and increased CO2.Key words: Water stress; Adaptation; Eggplant; Gas exchange; Stomatal density; Transpiration rateDOI: http://dx.doi.org/10.3329/bjb.v40i1.7985 Bangladesh J. Bot. 40(1): 1-8, 2011 (June)

scholarly journals Effect of drought on gas exchange and chlorophyll fluorescence of groundnut genotypes

2021 ◽  
Vol 13 (4) ◽  
pp. 1478-1487
Author(s):  
K. Manojkumar ◽  
S. Vincent ◽  
M. Raveendran ◽  
R. Anandham ◽  
V. Babu Rajendra Prasad ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Water Stress ◽  
Stomatal Conductance ◽  
Gas Exchange ◽  
Photosynthetic Rate ◽  
Photosynthetic Activity ◽  
Water Deficit Stress ◽  
Abiotic Factor ◽  
Gas Exchange Parameters ◽  
Ps Ii

Drought is one of the major threats to groundnut productivity, causing a greater loss than any other abiotic factor. Water stress conditions alter plant photosynthetic activity, impacting future growth and assimilating mobilization towards sink tissues. The purpose of this study was to investigate how drought impacts the photosynthesis of plants and its links to drought tolerance. The influence of reproductive stage drought on photosynthetic activity and chlorophyll fluorescence of groundnut is well studied. The experiment was conducted in Kharif 2019 (Jul-Sep), where recent series in groundnut genotypes (60 nos) sown under rainfed conditions and water stress was created by withholding irrigation for 20 days between 35-55 days after sowing in the field to simulate drought conditions. Imposition of water deficit stress reduced PS II efficiency, which significantly altered the photosynthetic rate in the leaf. Observation of gas exchange parameters viz., photosynthetic rate, stomatal conductance and transpiration rate after 20 days of stress imposition revealed that of all 60 genotypes, 20 genotypes (VG 17008, VG 17046VG 18005, VG 18102, VG 18077, VG 19572, VG 19709, VG 18111, VG19561, VG19576, VG 19620, VG 19681, VG 19688, etc.,) had better Photosynthetic rate, Stomatal conductance. Similarly, PS II efficiency analyzed through fluorescence meter revealed that among the 60 and all the genotypes given above recorded higher value in Fv/Fm. Results obtained from Cluster analysis and PCA confirmed that photosynthetic rate and Fv/Fm is useful parameter in screening adapted cultivars under drought stress. These findings lay the groundwork for a future study to decipher the molecular pathways underpinning groundnut drought resistance.

Photosynthetic responses to chromosome doubling in relation to leaf anatomy in Lonicera japonica subjected to water stress

2009 ◽  
Vol 36 (9) ◽  
pp. 783 ◽  
Author(s):  
Wei-Dong Li ◽  
Dilip K. Biswas ◽  
Hong Xu ◽  
Chang-Qing Xu ◽  
Xian-Zhong Wang ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Water Stress ◽  
Gas Exchange ◽  
Chromosome Doubling ◽  
Starch Content ◽  
Soluble Sugars ◽  
Net Photosynthesis ◽  
Lonicera Japonica ◽  
Photochemical Quenching ◽  
Effective Quantum Yield

Gas exchange, chlorophyll fluorescence, and contents of some metabolites in two Japanese honeysuckle (Lonicera japonica Thunb.) cultivars, Damaohua (2n = 2x) and Jiufengyihao (2n = 4x), were compared with explore the function of chromosome doubling under water stress conditions. Water stress significantly decreased net photosynthesis rate, stomatal conductance, and transpiration rate of both cultivars. It also decreased electron transport rate, effective quantum yield of Photosystem II, photochemical quenching, and starch content, but increased non-photochemical quenching and contents of total soluble sugars, proline, and malondialdehyde. However, the tetraploid cultivar showed higher resistance to water stress than the diploid, as indicated by the fact that gas exchange, chlorophyll fluorescence, and metabolites were less affected for the tetraploid than the diploid. Moreover, the tetraploid recovered more quickly than the diploid after re-watering. Morphological and anatomical analysis further revealed that the tetraploid possessed less whole plant leaf area, higher leaf mass per unit area, thicker epidermis (both upper and lower) and palisade tissue, as well as denser pubescence. All of those specialised structures caused by chromosome doubling might lead to greater capacity in coping with drought stress. Our findings suggest that the effect of chromosome doubling on drought resistance in L. japonica could attribute to the improvement of structure and photosynthesis-related traits.

Sign in / Sign up

Export Citation Format

Share Document