2026 Oula Ghannoum: Plant Science and Agronomy Researcher – H-Index, Publications & Awards

Discipline name	D-Index	World Ranking	Current World Ranking	National Ranking	Current National Ranking	Publications	Citations
Plant Science and Agronomy	44	2978	2769	224	210	123	9017

Overview

What is he best known for?

The fields of study he is best known for:

Ecology
Botany
Photosynthesis

Oula Ghannoum mostly deals with Photosynthesis, Botany, Carbon dioxide, Stomatal conductance and Transpiration. His work is dedicated to discovering how Photosynthesis, Agronomy are connected with Soil water and other disciplines. His Botany research integrates issues from Trehalose and Horticulture.

The Carbon dioxide study combines topics in areas such as Myrtaceae and Water content. Oula Ghannoum combines subjects such as Ecology, Climate change, Biome and Water-use efficiency with his study of Stomatal conductance. Oula Ghannoum studied Transpiration and C4 photosynthesis that intersect with Environmental chemistry.

His most cited work include:

The Origins of C4 Grasslands: Integrating Evolutionary and Ecosystem Science (666 citations)
C4 photosynthesis and water stress (346 citations)
Sensitivity of plants to changing atmospheric CO2 concentration: From the geological past to the next century (234 citations)

What are the main themes of his work throughout his whole career to date?

The scientist’s investigation covers issues in Photosynthesis, Botany, Stomatal conductance, Horticulture and Agronomy. As a member of one scientific family, Oula Ghannoum mostly works in the field of Photosynthesis, focusing on Acclimatization and, on occasion, Respiration. His research on Botany often connects related topics like Animal science.

His Stomatal conductance study combines topics from a wide range of disciplines, such as Photosynthetic capacity, Ecology, Ecosystem and Water-use efficiency. His Horticulture research incorporates elements of Bothriochloa bladhii, Carbon dioxide and Photosynthetically active radiation. Temperate climate is closely connected to Eucalyptus in his research, which is encompassed under the umbrella topic of Agronomy.

He most often published in these fields:

Photosynthesis (74.44%)
Botany (50.00%)
Stomatal conductance (32.22%)

What were the highlights of his more recent work (between 2018-2021)?

Photosynthesis (74.44%)
Horticulture (32.22%)
Acclimatization (14.44%)

In recent papers he was focusing on the following fields of study:

Oula Ghannoum mainly focuses on Photosynthesis, Horticulture, Acclimatization, C4 photosynthesis and Stomatal conductance. Oula Ghannoum combines topics linked to Carotenoid with his work on Photosynthesis. His research in Horticulture intersects with topics in Photosynthetic capacity and Photosynthetically active radiation.

His studies deal with areas such as Thylakoid, Sorghum and Leaf water as well as C4 photosynthesis. His studies in Stomatal conductance integrate themes in fields like Tundra, Ecosystem, Vegetation and Water-use efficiency. The subject of his Photosystem research is within the realm of Botany.

Between 2018 and 2021, his most popular works were:

Acclimation and adaptation components of the temperature dependence of plant photosynthesis at the global scale (61 citations)
Lower photorespiration in elevated CO2 reduces leaf N concentrations in mature Eucalyptus trees in the field. (18 citations)
Elevated CO2 alleviates the negative impact of heat stress on wheat physiology but not on grain yield (17 citations)

In his most recent research, the most cited papers focused on:

Ecology
Botany
Photosynthesis

His primary areas of investigation include Photosynthesis, Horticulture, Acclimatization, Phosphoenolpyruvate carboxylase activity and Respiration. His work deals with themes such as Phosphoenolpyruvate carboxykinase and Vegetation, which intersect with Photosynthesis. His Horticulture research incorporates themes from Nitrate reductase, Nitrate, Nitrogen assimilation and Carbohydrate.

His Acclimatization study incorporates themes from Adaptation, Tundra, Ecosystem and Stomatal conductance. He integrates Phosphoenolpyruvate carboxylase activity and Degree in his studies.

Best Publications

The Origins of C4 Grasslands: Integrating Evolutionary and Ecosystem Science

Erika J. Edwards;Colin P. Osborne;Caroline A.E. Strömberg;Stephen A. Smith

1163
Citations
C4 photosynthesis and water stress

Oula Ghannoum

667
Citations
Optimal stomatal behaviour around the world

Yan Shih Lin;Belinda E. Medlyn;Remko A. Duursma;I. Colin Prentice;I. Colin Prentice

586
Citations
Sensitivity of plants to changing atmospheric CO2 concentration: From the geological past to the next century

Peter J Franks;Mark A Adams;Jeffrey S. Amthor;Margaret M Barbour

448
Citations
The growth response of C4 plants to rising atmospheric CO2 partial pressure: a reassessment

O. Ghannoum;S. Von Caemmerer;L. H. Ziska;J. P. Conroy

391
Citations
Acclimation and adaptation components of the temperature dependence of plant photosynthesis at the global scale

Dushan P. Kumarathunge;Belinda E. Medlyn;John E. Drake;Mark G. Tjoelker

323
Citations
Faster Rubisco is the key to superior nitrogen-use efficiency in NADP-malic enzyme relative to NAD-malic enzyme C4 grasses.

Oula Ghannoum;John R. Evans;Wah Soon Chow;T. John Andrews

303
Citations
Genetic modification of photosynthesis with E. coli genes for trehalose synthesis

Till K Pellny;Oula Ghannoum;Jann P Conroy;Henriette Schluepmann

200
Citations
The capacity to cope with climate warming declines from temperate to tropical latitudes in two widely distributed Eucalyptus species

John E. Drake;Michael J. Aspinwall;Sebastian Pfautsch;Paul D. Rymer

181
Citations
AusTraits, a curated plant trait database for the Australian flora.

Daniel Falster;Rachael Gallagher;Rachael Gallagher;Elizabeth H. Wenk;Ian J. Wright

180
Citations
Exposure to preindustrial, current and future atmospheric CO2 and temperature differentially affects growth and photosynthesis in Eucalyptus

Oula Ghannoum;Nathan G. Phillips;Nathan G. Phillips;Jann P. Conroy;Renee A. Smith

165
Citations
Nonstomatal limitations are responsible for drought-induced photosynthetic inhibition in four C4 grasses.

Oula Ghannoum;Oula Ghannoum;Jann P. Conroy;Simon P. Driscoll;Matthew J. Paul

159
Citations
High temperature acclimation of C4 photosynthesis is linked to changes in photosynthetic biochemistry

Simon A Dwyer;Oula Ghannoum;Adrienne B Nicotra;Susanna Von Caemmerer

144
Citations
Nitrogen and Water Use Efficiency of C 4 Plants

Oula Ghannoum;John R. Evans;Susanne von Caemmerer

144
Citations
Carbon isotope discrimination as a tool to explore C4 photosynthesis

Susanne von Caemmerer;Oula Ghannoum;Jasper J. L. Pengelly;Asaph B. Cousins

143
Citations
The effect of drought on plant water use efficiency of nine NAD-ME and nine NADP-ME Australian C4 grasses

Oula Ghannoum;Susanne von Caemmerer;Jann P Conroy

140
Citations
Temperature responses of Rubisco from Paniceae grasses provide opportunities for improving C3 photosynthesis

Robert E Sharwood;Oula Ghannoum;Maxim V Kapralov;Laura H Gunn

139
Citations
The Effect of CO2 Enrichment and Irradiance on the Growth, Morphology and Gas Exchange of a C3 (Panicum laxum) and a C4 (Panicum antidotale) Grass

Oula Ghannoum;Susanne von Caemmerer;Edward W. R. Barlow;Jann P. Conroy

131
Citations
Photosynthetic responses of two eucalypts to industrial-age changes in atmospheric [CO2] and temperature

Oula Ghannoum;Nathan G. Phillips;Marie A. Sears;Barry A. Logan

128
Citations
Convergent acclimation of leaf photosynthesis and respiration to prevailing ambient temperatures under current and warmer climates in Eucalyptus tereticornis

Michael J. Aspinwall;John E. Drake;Courtney Campany;Angelica Vårhammar

127
Citations
Changes in source-sink relations during development influence photosynthetic acclimation of rice to free air CO2 enrichment (FACE).

Saman P. Seneweera;Oula Ghannoum;Jann P. Conroy;Ken Ishimaru

118
Citations