Root morphology, gas exchange and chlorophyll fluorescence of coffee cultivars and progenies are altered by Meloidogyne paranaensis infestation and water deficit

2020 ◽  
Vol 168 (4) ◽  
pp. 220-227
Author(s):  
Alan Teixeira Pasqualotto ◽  
Sônia Maria de Lima Salgado ◽  
Willian César Terra ◽  
Bárbhara Joana dos Reis Fatobene ◽  
Helbert Rezende de Oliveira Silveira ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Gas Exchange ◽  
Water Deficit ◽  
Root Morphology

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.

Tolerance to water deficit in cowpea populations resulting from breeding program: detection by gas exchange and chlorophyll fluorescence

2016 ◽  
Vol 21 (2) ◽  
pp. 171-178 ◽  
Author(s):  
Talitha S. Pereira ◽  
Michael D. R. Lima ◽  
Lucélia S. Paula ◽  
Allan K. S. Lobato
Keyword(s):  
Chlorophyll Fluorescence ◽  
Gas Exchange ◽  
Water Deficit ◽  
Breeding Program

The Effect of Water Shortage on Potted Peach Trees in Relation to Ecophysiological Parameters and Infra-red Thermometry

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 541b-541
Author(s):  
Rita Giuliani ◽  
James A. Flore
Keyword(s):  
Chlorophyll Fluorescence ◽  
Gas Exchange ◽  
Early Detection ◽  
Water Potential ◽  
Canopy Temperature ◽  
Water Shortage ◽  
Development Rate ◽  
Plant Water ◽  
Infra Red ◽  
Peach Trees

Potted peach trees grown outdoors during the 1997 season were subjected to drought and subsequent rewatering to evaluate their dynamic response to soil water content. The investigation was primarily focused on the early detection of plant water stress to prevent negative effects on the growth. Leaf chlorophyll fluorescence and canopy temperature estimates (by infra-red thermometry) were conducted. Drought effect on physiological processes were detected through by estimates of canopy development rate, leaf gas-exchange measurements; while leaf water potential was measured to characterize plant water status. A decrease in the canopy's development rate was found 1 week after irrigation was stopped, which also coincided with a more-negative leaf water potential, whereas a decrease of the gas-exchange activities occurred several days later. No significant differences between the stressed and control plants were recorded by the chlorophyll fluorescence parameters (Fo, Fm, Fv and the ratio Fv/Fm), whereas the infra-red estimates of canopy temperature detected a slight increase of the canopy surface temperature (connected to the change of leaf energy balance and in relation to partial stomatal closure) on the non-irrigated plants 1 week after the beginning of the trial. The use of infra-red thermometry for early detection of water shortage is discussed.

Photosynthesis and chlorophyll fluorescence responses of Populus sibirica to water deficit in a desertification area in Mongolia

2016 ◽  
Vol 54 (2) ◽  
pp. 317-320 ◽  
Author(s):  
T. Y. Lee ◽  
S. Y. Woo ◽  
M. J. Kwak ◽  
K. Inkyin ◽  
K. E. Lee ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Water Deficit

The effect of water deficit on some physiological indices of Indian lettuce (Lactuca indica L.)

2021 ◽  
Vol 66 (1) ◽  
pp. 80-86
Author(s):  
Thin Pham Thi Thanh ◽  
Bang Cao Phi ◽  
Hai Nguyen Thi Thanh ◽  
Khuynh Bui The ◽  
Mai Nguyen Phuong ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Water Stress ◽  
Water Content ◽  
Flowering Time ◽  
Water Deficit ◽  
Physiological Responses ◽  
Water Deficit Stress ◽  
Flower Formation ◽  
Lactuca Indica ◽  
Wilting Rate

Indian Lettuce (Lactuca indica L.) is a valuable medicinal herb but there are still no many researches about this plant. In this work, the physiological responses of Indian lettuce plants under water deficit conditions (5, 8, and 11 days of water stress) were investigated. The Indian lettuce wilted after 5 days of water stress (66.66%), the wilting rate increased after 8 (93.33%) and 11 days (100%) of water stress. The longer duration of water deficit stress caused the slower recovery of plants after rewatering. The water deficit stress caused a decrease in chlorophyll fluorescence, non-associated water content as well as flower formation of Indian lettuce. But the water deficit stress increases the associated water content and the flowering time of this plant.

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