scholarly journals Impact of oxygation on soil respiration, yield and water use efficiency of three crop species

2010 ◽  
Vol 4 (4) ◽  
pp. 236-248 ◽  
Author(s):  
X. Chen ◽  
J. Dhungel ◽  
S. P. Bhattarai ◽  
M. Torabi ◽  
L. Pendergast ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Water Use Efficiency ◽  
Water Use ◽  
Crop Species ◽  
Use Efficiency

scholarly journals Abscisic Acid Biosynthesis and Signaling in Plants: Key Targets to Improve Water Use Efficiency and Drought Tolerance

2020 ◽  
Vol 10 (18) ◽  
pp. 6322 ◽  
Author(s):  
Amanda A. Cardoso ◽  
Antonella Gori ◽  
Cristiane J. Da-Silva ◽  
Cecilia Brunetti
Keyword(s):  
Abscisic Acid ◽  
Drought Tolerance ◽  
Water Use Efficiency ◽  
Water Use ◽  
Acid Biosynthesis ◽  
Abscisic Acid Biosynthesis ◽  
Crop Species ◽  
Use Efficiency ◽  
Aba Biosynthesis ◽  
Made In

The observation of a much-improved fitness of wild-type plants over abscisic acid (ABA)-deficient mutants during drought has led researchers from all over to world to perform experiments aiming at a better understanding of how this hormone modulates the physiology of plants under water-limited conditions. More recently, several promising approaches manipulating ABA biosynthesis and signaling have been explored to improve water use efficiency and confer drought tolerance to major crop species. Here, we review recent progress made in the last decade on (i) ABA biosynthesis, (ii) the roles of ABA on plant-water relations and on primary and secondary metabolisms during drought, and (iii) the regulation of ABA levels and perception to improve water use efficiency and drought tolerance in crop species.

scholarly journals Leaf gas exchange in cowpea and CO2 efflux in soil irrigated with saline water

2017 ◽  
Vol 21 (1) ◽  
pp. 32-37 ◽  
Author(s):  
Wanderson J. de Oliveira ◽  
Edivan R. de Souza ◽  
Jailson C. Cunha ◽  
Ênio F. de F. e Silva ◽  
Venâncio de L. Veloso
Keyword(s):  
Soil Respiration ◽  
Water Use Efficiency ◽  
Water Use ◽  
Saline Water ◽  
Leaf Gas Exchange ◽  
Soil Co2 Efflux ◽  
Co2 Efflux ◽  
Soil Co2 ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency

ABSTRACT Leaf gas exchanges in plants and soil respiration are important tools for assessing the effects of salinity on the soil-plant system. An experiment was conducted with cowpea irrigated with saline water (0, 2.5, 5.0, 7.5, 10.0 and 12.5 dS m-1) prepared with two sources: NaCl and a mixture of Ca, Mg, Na, K and Cl ions in a randomized block design and a 6 x 2 factorial scheme, with four replicates, totaling 48 experimental plots. At 20 days after planting (DAP), plants were evaluated for net photosynthesis (A), stomatal conductance (gs) and transpiration (E) using the Infra-Red Gas Analyzer (Model XT6400- LICOR), and water use efficiency, intrinsic water use efficiency and instantaneous efficiency of carboxylation were calculated. At 60 DAP, the soil CO2 efflux (soil respiration) was determined with a camera (Model 6400-09- LICOR). Salinity caused reductions in A, gs and E. However, the salt source did not have significant effect on these variables. Soil CO2 efflux was reduced with the increase in the electrical conductivity, especially in the mixture of ions.

scholarly journals Impact of Ambient and Elevated [CO2] in Low Light Levels on Growth, Physiology and Nutrient Uptake of Tropical Perennial Legume Cover Crops

Plants ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 193
Author(s):  
Virupax C. Baligar ◽  
Marshall K. Elson ◽  
Zhenli He ◽  
Yuncong Li ◽  
Arlicelio de Q. Paiva ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Nutrient Uptake ◽  
Elevated Co2 ◽  
Water Use ◽  
Cover Crops ◽  
Cover Crop ◽  
Crop Species ◽  
Legume Cover Crops ◽  
Use Efficiency ◽  
Perennial Legume

At early stages of establishment of tropical plantation crops, inclusion of legume cover crops could reduce soil degradation due to erosion and nutrient leaching. As understory plants these cover crops receive limited irradiance and can be subjected to elevated CO2 at ground level. A glasshouse experiment was undertaken to assess the effects of ambient (450 µmol mol−1) and elevated (700 µmol mol−1) levels of [CO2] on growth, physiological changes and nutrient uptake of six perennial legume cover crops (Perennial Peanut, Ea-Ea, Mucuna, Pigeon pea, Lab lab, Cowpea) under low levels of photosynthetic photon flux density (PPFD; 100, 200, and 400 µmol m−2 s−1). Overall, total and root dry biomass, total root length, specific leaf area, and relative growth rates were significantly influenced by levels of [CO2] and PPFD and cover crop species. With few exceptions, all the cover crops showed significant effects of [CO2], PPFD, and species on net photosynthesis (PN) and its components, such as stomatal conductance (gs) internal CO2 conc. (Ci), and transpiration (E). Increasing [CO2], from 450 to 700 μmol mol−1 and increasing PPFD from 100 to 400 μmol ּm−2 ּs−1 increased PN. Overall, the levels of [CO2], PPFD and species significantly affected total water use efficiency (WUETOTAL), instantaneous water use efficiency (WUEINST) and intrinsic water use efficiency (WUEINTR). With some exceptions, increasing levels of [CO2] and PPFD increased all the WUE parameters. Interspecific differences were observed with respect to macro-micro nutrient uptake and use efficiency. With a few exceptions, increasing levels of [CO2] from 450 to 700 μmol mol−1 and PPFD from 100 to 400 μmol m−2 s−1 increased nutrient use efficiency (NUE) of all nutrients by cover crop species.

Effects of doubled CO2 concentration on leaf photosynthesis, transpiration and water use efficiency of eight crop species

2013 ◽  
Vol 36 (5) ◽  
pp. 438-446
Author(s):  
Jian-Lin WANG ◽  
Xue-Fa WEN ◽  
Feng-Hua ZHAO ◽  
Quan-Xiao FANG ◽  
Xin-Min YANG
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Leaf Photosynthesis ◽  
Crop Species ◽  
Use Efficiency

Water-use efficiency of crops under drought: A global meta-analysis

2020 ◽  
Author(s):  
Liuyang Yu ◽  
Xining Zhao ◽  
Xiaodong Gao
Keyword(s):  
Drought Stress ◽  
Water Resources ◽  
Water Use Efficiency ◽  
Water Use ◽  
Arid Regions ◽  
Meta Analysis ◽  
High Yield ◽  
Crop Species ◽  
Drought Intensity ◽  
Use Efficiency

<p>Crops are facing greater drought stress and are being relocated to more arid regions as the climate changes. Ranking high-yield crops according to their efficient and sustainable use of water resources under drought stress is critical for selecting suitable crops to relieve the stress on food security and water resources in dryland agricultural regions. A global meta-analysis was conducted by incorporating 907 experimental observations from 96 research studies to assess the water-use efficiency (WUE) of 40 crop species under drought stress conditions across various environments. The results showed that compared with well-watered conditions, drought stress decreased crop WUE significantly by an average of 2.8%, but the effects varied among crop species. Most (93.6%) of the variance in crop WUE could be explained by four factors and drought intensity was the most important factor (32.9%), followed by climate type (23.5%), soil texture (20.2%), and crop type (17.1%). Perennial, liana, fiber, and fruit crops displayed the largest increases in WUE under drought stress. Moreover, crops grown in semi-arid regions with medium-textured soil and a drought intensity of < 20% showed the best WUE performance relative to crops grown in other environments. The specific ranks of crops according to their WUE in response to drought across different environments were given. This study highlights factors affecting the WUE of crops in response to drought and provides high-yield crop candidates that can adapt to drought in drylands. The dataset has been made freely available and could be updated with more crop species in the future.</p>

Increasing intrinsic water-use efficiency over the past 160 years does not stimulate tree growth in southeastern China

2018 ◽  
Vol 76 (2) ◽  
pp. 115-130 ◽  
Author(s):  
G Guo ◽  
K Fang ◽  
J Li ◽  
HW Linderholm ◽  
D Li ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Tree Growth ◽  
Southeastern China ◽  
The Past ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency
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