scholarly journals Gas Exchange and Carbon Partitioning in the Leaves of Celery (Apium graveolens L.) at Various Levels of Root Zone Salinity

1994 ◽  
Vol 106 (1) ◽  
pp. 281-292 ◽  
Author(s):  
J. D. Everard ◽  
R. Gucci ◽  
S. C. Kann ◽  
J. A. Flore ◽  
W. H. Loescher
Keyword(s):  
Gas Exchange ◽  
Root Zone ◽  
Carbon Partitioning ◽  
Apium Graveolens ◽  
Root Zone Salinity

scholarly journals 733 PB 023 PHOTOSYNTHESIS AND MANNITOL/SUCROSE PARTITIONING UNDER DIFFERENT CO, ASSIMILATION CONDITIONS IN CELERY

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 538a-538
Author(s):  
Riccardo Gucci ◽  
John Everard ◽  
James Flore ◽  
Wayne Loescher
Keyword(s):  
Gas Exchange ◽  
Carbon Partitioning ◽  
Compensation Point ◽  
Carboxylation Efficiency ◽  
Apium Graveolens ◽  
Polyol Synthesis ◽  
Photosynthetic Rates ◽  
Sucrose Partitioning

Photosynthetic rates (A) in celery-(Apium graveolens L.) and other polyol-synthesizers are sometimes high for C, species. In celery such rates have been related to a low CO2 compensation point typical of C4 and C3-C4 intermediate spp, although other data show celery photosynthesis as typically C3 Therefore, celery gas exchange was here reanalyzed, and while A was high (CO2 assimilation rates were 21.2 and 27.6 μ mol m-2s-1, average and maximum, photosynthesis was otherwise C,: CO, comp pt of 3.5-5.0 Pa, carboxylation efficiency of 0.99 μmol CO2m-2s-1Pa-1, light comp pt of 8-36 μ mol photon m-1s-1, optimum temp of 22-27°C for Amax. High A may relate to a capacity to synthesize both mannitol and sucrose. 14C pulse-chase studies, with different A obtained by imposing light gradients across opposite leaflets, showed 1-10% increases in mannitoll sucrose labelling. Higher A may reflect carbon partitioning into mannitol, agreeing with a hypothesis that polyol synthesis effectively recycles reductant in the cytosol.

GROWTH, GAS EXCHANGE AND IONIC RELATIONS OF PEACH ROOTSTOCKS UNDER ROOT ZONE SALINITY STRESS

2002 ◽  
pp. 553-559 ◽  
Author(s):  
M. Tattini ◽  
G. Montagni ◽  
L. Andreini ◽  
D. Remorini ◽  
R. Massai
Keyword(s):  
Gas Exchange ◽  
Salinity Stress ◽  
Root Zone ◽  
Ionic Relations ◽  
Peach Rootstocks ◽  
Root Zone Salinity

scholarly journals Policy-Driven Sustainable Saline Drainage Disposal and Forage Production in the Western San Joaquin Valley of California

2020 ◽  
Vol 12 (16) ◽  
pp. 6362
Author(s):  
Amninder Singh ◽  
Nigel W. T. Quinn ◽  
Sharon E. Benes ◽  
Florence Cassel
Keyword(s):  
Root Zone ◽  
Subsurface Drainage ◽  
Drainage Water ◽  
Agricultural Drainage ◽  
Forage Production ◽  
Tall Wheatgrass ◽  
San Joaquin River ◽  
Agricultural Drainage Water ◽  
Irrigation Drainage ◽  
Root Zone Salinity

Environmental policies to address water quality impairments in the San Joaquin River of California have focused on the reduction of salinity and selenium-contaminated subsurface agricultural drainage loads from westside sources. On 31 December 2019, all of the agricultural drainage from a 44,000 ha subarea on the western side of the San Joaquin River basin was curtailed. This policy requires the on-site disposal of all of the agricultural drainage water in perpetuity, except during flooding events, when emergency drainage to the River is sanctioned. The reuse of this saline agricultural drainage water to irrigate forage crops, such as ‘Jose’ tall wheatgrass and alfalfa, in a 2428 ha reuse facility provides an economic return on this pollutant disposal option. Irrigation with brackish water requires careful management to prevent salt accumulation in the crop root zone, which can impact forage yields. The objective of this study was to optimize the sustainability of this reuse facility by maximizing the evaporation potential while achieving cost recovery. This was achieved by assessing the spatial and temporal distribution of the root zone salinity in selected fields of ‘Jose’ tall wheatgrass and alfalfa in the drainage reuse facility, some of which have been irrigated with brackish subsurface drainage water for over fifteen years. Electromagnetic soil surveys using an EM-38 instrument were used to measure the spatial variability of the salinity in the soil profile. The tall wheatgrass fields were irrigated with higher salinity water (1.2–9.3 dS m−1) compared to the fields of alfalfa (0.5–6.5 dS m−1). Correspondingly, the soil salinity in the tall wheatgrass fields was higher (12.5 dS m−1–19.3 dS m−1) compared to the alfalfa fields (8.97 dS m−1–14.4 dS m−1) for the years 2016 and 2017. Better leaching of salts was observed in the fields with a subsurface drainage system installed (13–1 and 13–2). The depth-averaged root zone salinity data sets are being used for the calibration of the transient hydro-salinity computer model CSUID-ID (a one-dimensional version of the Colorado State University Irrigation Drainage Model). This user-friendly decision support tool currently provides a useful framework for the data collection needed to make credible, field-scale salinity budgets. In time, it will provide guidance for appropriate leaching requirements and potential blending decisions for sustainable forage production. This paper shows the tie between environmental drainage policy and the role of local governance in the development of sustainable irrigation practices, and how well-directed collaborative field research can guide future resource management.

Partial root-zone drying in field-grown papaya: Gas exchange, yield, and water use efficiency

2021 ◽  
Vol 243 ◽  
pp. 106421
Author(s):  
Dionei Lima Santos ◽  
Eugênio Ferreira Coelho ◽  
Fernando França da Cunha ◽  
Sérgio Luiz Rodrigues Donato ◽  
Wallace de Paula Bernado ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Water Use Efficiency ◽  
Water Use ◽  
Root Zone ◽  
Use Efficiency

scholarly journals Root-Zone Salinity Alters Raffinose Oligosaccharide Metabolism and Transport in Coleus

1997 ◽  
Vol 115 (3) ◽  
pp. 1267-1276 ◽  
Author(s):  
G. A. Gilbert ◽  
C. Wilson ◽  
M. A. Madore
Keyword(s):  
Root Zone ◽  
Root Zone Salinity

scholarly journals Heterogeneous root zone salinity mitigates salt injury to Sorghum bicolor (L.) Moench in a split-root system

PLoS ONE ◽  
2019 ◽  
Vol 14 (12) ◽  
pp. e0227020
Author(s):  
Huawen Zhang ◽  
Runfeng Wang ◽  
Hailian Wang ◽  
Bin Liu ◽  
Mengping Xu ◽  
...  
Keyword(s):  
Sorghum Bicolor ◽  
Root System ◽  
Root Zone ◽  
Split Root ◽  
Split Root System ◽  
Sorghum Bicolor L ◽  
Root Zone Salinity
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