scholarly journals Role of leaf hydraulic conductance in the regulation of stomatal conductance in almond and olive in response to water stress

2016 ◽  
Vol 36 (6) ◽  
pp. 725-735 ◽  
Author(s):  
Virginia Hernandez-Santana ◽  
Celia M. Rodriguez-Dominguez ◽  
J. Enrique Fernández ◽  
Antonio Diaz-Espejo
Keyword(s):  
Water Stress ◽  
Stomatal Conductance ◽  
Hydraulic Conductance ◽  
Leaf Hydraulic Conductance ◽  
Response To Water

scholarly journals Stomatal conductance and root-to-shoot signalling in chestnut saplings exposed to Phytophthora cinnamomi or partial soil drying

2004 ◽  
Vol 31 (1) ◽  
pp. 41 ◽  
Author(s):  
Marion Maurel ◽  
Cécile Robin ◽  
Thierry Simonneau ◽  
Denis Loustau ◽  
Erwin Dreyer ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Potential Role ◽  
Phytophthora Cinnamomi ◽  
Castanea Sativa ◽  
Hydraulic Conductance ◽  
Leaf Water ◽  
Split Root

The effects of root infection by Phytophthora cinnamomi on stomatal conductance in Castanea sativa L. saplings were investigated to determine the potential role of root-derived chemical signals. A split-root experiment was carried out, in which inoculation of the pathogen or drought was applied to the root systems in either one or both compartments. At the end of the experiment plant sap extracts were collected and their effects on stomatal conductance were determined by leaf bioassay. Inoculation or drought imposed in both compartments resulted in decreases in stomatal conductance (gs), transpiration rate, soil-to-leaf specific hydraulic conductance, leaf water potential, xylem [ABA] and root biomass, but not in the ratio of root-to-leaf mass in inoculated plants. Conversely, only gs and xylem [ABA] were affected in plants inoculated or droughted in one compartment, and no changes were detectable in leaf water potential and soil-to-leaf specific hydraulic conductance. The leaf bioassay showed that gs in chestnut was sensitive to ABA but not to Phytophthora elicitins. Stomatal conductance was reduced by some sap extracts, both from control and inoculated plants. Our results suggest the involvement of different signals, chemical and hydraulic, in regulating stomatal conductance of chestnut at different stages of stress.

scholarly journals A mutation that eliminates bundle sheath extensions reduces leaf hydraulic conductance, stomatal conductance and assimilation rates in tomato (Solanum lycopersicum)

2014 ◽  
Vol 205 (2) ◽  
pp. 618-626 ◽  
Author(s):  
Agustin Zsögön ◽  
Ana Clarissa Alves Negrini ◽  
Lázaro Eustáquio Pereira Peres ◽  
Hoa Thi Nguyen ◽  
Marilyn C. Ball
Keyword(s):  
Stomatal Conductance ◽  
Solanum Lycopersicum ◽  
Hydraulic Conductance ◽  
Bundle Sheath ◽  
Leaf Hydraulic Conductance

Water transport from stem to stomata: the coordination of hydraulic and gas exchange traits across 33 subtropical woody species

2019 ◽  
Vol 39 (10) ◽  
pp. 1665-1674 ◽  
Author(s):  
Xiaorong Liu ◽  
Hui Liu ◽  
Sean M Gleason ◽  
Guillermo Goldstein ◽  
Shidan Zhu ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Gas Exchange ◽  
Water Transport ◽  
Explanatory Power ◽  
Woody Species ◽  
Hydraulic Conductance ◽  
Co2 Assimilation ◽  
Leaf Hydraulic Conductance ◽  
Net Co2 Assimilation ◽  
Leaf Tissues

Abstract Coordination between sapwood-specific hydraulic conductivity (Ks) and stomatal conductance (gs) has been identified in previous studies; however, coordination between leaf hydraulic conductance (Kleaf) and gs, as well as between Kleaf and Ks is not always consistent. This suggests that there is a need to improve our understanding of the coordination among hydraulic and gas exchange traits. In this study, hydraulic traits (e.g., Ks and Kleaf) and gas exchange traits, including gs, transpiration (E) and net CO2 assimilation (Aarea), were measured across 33 co-occurring subtropical woody species. Kleaf was divided into two components: leaf hydraulic conductance inside the xylem (Kleaf-x) and outside the xylem (Kleaf-ox). We found that both Kleaf-x and Kleaf-ox were coordinated with gs and E, but the correlations between Kleaf-ox and gs (or E) were substantially weaker, and that Ks was coordinated with Kleaf-x, but not with Kleaf-ox. In addition, we found that Ks, Kleaf-x and Kleaf-ox together explained 63% of the variation in gs and 42% of the variation in Aarea across species, with Ks contributing the largest proportion of explanatory power, whereas Kleaf-ox contributed the least explanatory power. Our results demonstrate that the coordination between leaf water transport and gas exchange, as well as the hydraulic linkage between leaf and stem, were weakened by Kleaf-ox. This highlights the possibility that water transport efficiencies of stem and leaf xylem, rather than that of leaf tissues outside the xylem, are important determinants of stomatal conductance and photosynthetic capacity across species.

Response to water stress of Italian alder seedlings from diverse geographic origins

1989 ◽  
Vol 19 (8) ◽  
pp. 1071-1076 ◽  
Author(s):  
M. Borghetti ◽  
S. Cocco ◽  
M. Lambardi ◽  
S. Raddi
Keyword(s):  
Water Stress ◽  
Stomatal Conductance ◽  
Leaf Area ◽  
Water Status ◽  
Net Photosynthesis ◽  
Severe Drought ◽  
Xylem Water Potential ◽  
Drought Treatment ◽  
Internal Water ◽  
Response To Water

The morphological and physiological response to water stress was studied in 2-year-old potted Italian alder (Alnuscordata Loisel.) seedlings. Leaf area, transpiration, stomatal conductance, and xylem water potential were measured during May 1987 on seedlings from five geographic sources grown (i) with soil water content close to field capacity and (ii) with a severe drought. Significant differences in leaf area were found, at the end of the experiment, between drought-stressed and well-watered plants. As drought progressed, plants displayed a reduction of xylem water potentials and a decrease in stomatal conductance. However, transpiration did not stop completely, and seedlings were not able to maintain a favourable internal water status. Osmotic potentials for the undiluted cell sap, estimated from pressure–volume curves, were between −0.9 and −1.3 MPa. In June 1988, a similar experiment was carried out using seedlings from only one geographic source. A simultaneous decrease of transpiration, xylem potential, and net photosynthesis was observed in seedlings subjected to the drought treatment. During both experiments, a recovery of physiological parameters was observed, after rewatering. Some differences between provenances were detected. The provenance from Corsica showed the greatest sensitivity to water stress; a seed source from the province of Avellino (Campania, south Italy) was able to maintain a more favourable internal water status, as drought progressed.

Photosynthesis and the Accumulation of Proline in Response to Water Deficit

1992 ◽  
Vol 19 (3) ◽  
pp. 249 ◽  
Author(s):  
PA Joyce ◽  
D Aspinall ◽  
LG Paley
Keyword(s):  
Water Stress ◽  
Potential Energy ◽  
Energy Supply ◽  
Proline Accumulation ◽  
Soluble Carbohydrate ◽  
Light Stimulation ◽  
Stress Energy ◽  
Response To Water ◽  
Stimulation Of

Light increases proline accumulation in water-stressed excised leaves of barley, and the response is linked to photosynthesis. The manner in which current photosynthesis contributes to proline accumulation and the role of soluble tissue carbohydrates has been examined. Increasing the CO2 content of the air surrounding stressed tissue had no effect on proline accumulation and reducing it to zero reduced proline accumulation only in leaves previously kept in darkness. The direct contribution of assimilated carbon to proline synthesis, assessed with labelled CO2, was small (< 10% of accumulated proline). The potential energy supply from photosynthesis during water stress was more than adequate for proline synthesis, but the potential energy supply from carbohydrate oxidation for segments stressed in darkness became limiting in leaves incubated in darkness for 48 h before stress. Energy provision from current photosynthesis may thus contribute to light stimulation of proline accumulation. Illumination modified the soluble carbohydrate content of the leaf segments and these variations were related to the rates of proline synthesis and oxidation. However, these effects were over-ridden by stress, and the mechanism of the response to light is not fully explained.

scholarly journals Expression of NCED gene in colored cotton genotypes subjected to water stress

2016 ◽  
Vol 20 (8) ◽  
pp. 692-696 ◽  
Author(s):  
Alexandre M. S. de Souza ◽  
Vandré G. L. Batista ◽  
Morganna P. N. Pinheiro ◽  
Janivan F. Suassuna ◽  
Liziane M. de Lima ◽  
...  
Keyword(s):  
Water Stress ◽  
Stomatal Conductance ◽  
Gas Exchange ◽  
Plant Growth ◽  
Differential Expression ◽  
Rt Pcr ◽  
Colored Cotton ◽  
Cotton Genotypes ◽  
Nced Gene ◽  
Response To Water

ABSTRACT Considering that the NCED gene acts on the biosynthetic cascade of ABA, a hormone involved in the functioning of stomata and consequently in the regulation of transpiration, the aim of this research was to analyze the expression of this gene in colored cotton genotypes subjected to water stress at the beginning of plant growth. Four colored cotton genotypes were used, subjected to two managements, with and without water stress, beginning the treatments when the blade of the first true leaves reached an area that allowed the evaluation of gas exchange. For the studies of the expression of the NCED gene, via RT-qPCR, leaves were collected on three distinct dates: at 4 and 6 days of water stress, and after the plants regained their turgor. The differential expression of NCED was found in all genotypes, with higher levels of expression related to six days of water stress. When the stomatal conductance was around 25%, there was overexpression in the genotype CNPA 2009.13, followed by CNPA 2009.6, BRS SAFIRA and CNPA 2009.11, confirming the data obtained in the semi-quantitative RT-PCR. The NCED gene is involved in the response to water stress in the vegetative phase of colored cotton.

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