World's Best Scientists 2026 revealed!

D-Index & Metrics

Plant Science and Agronomy

D-Index
44
Citations
9017
World Ranking
2978
National Ranking
224

Oula Ghannoum publication distribution in Plant Science and Agronomy in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Plant Science and Agronomy in 2026. The highlighted bar marks where Oula Ghannoum sits on this spectrum.

36–40 publications: 2 scientists 41–45 publications: 7 scientists 46–50 publications: 40 scientists 51–55 publications: 58 scientists 56–60 publications: 60 scientists 61–65 publications: 107 scientists 66–70 publications: 130 scientists 71–75 publications: 153 scientists 76–80 publications: 191 scientists 81–85 publications: 199 scientists 86–90 publications: 206 scientists 91–95 publications: 218 scientists 96–100 publications: 226 scientists 101–105 publications: 227 scientists 106–110 publications: 247 scientists 111–115 publications: 255 scientists 116–120 publications: 253 scientists 121–125 publications: 233 scientists 126–130 publications: 219 scientists 131–135 publications: 201 scientists 136–140 publications: 194 scientists 141–145 publications: 176 scientists 146–150 publications: 157 scientists 151–155 publications: 147 scientists 156–160 publications: 151 scientists 161–165 publications: 159 scientists 166–170 publications: 137 scientists 171–175 publications: 128 scientists 176–180 publications: 126 scientists 181–185 publications: 98 scientists 186–190 publications: 114 scientists 191–195 publications: 100 scientists 196–200 publications: 90 scientists 201–205 publications: 71 scientists 206–210 publications: 98 scientists 211–215 publications: 70 scientists 216–220 publications: 86 scientists 221–225 publications: 61 scientists 226–230 publications: 58 scientists 231–235 publications: 53 scientists 236–240 publications: 64 scientists 241–245 publications: 39 scientists 246–250 publications: 46 scientists 251–255 publications: 51 scientists 256–260 publications: 36 scientists 261–265 publications: 44 scientists 266–270 publications: 35 scientists 271–275 publications: 30 scientists 276–280 publications: 33 scientists 281–285 publications: 35 scientists 286–290 publications: 36 scientists 291–295 publications: 26 scientists 296–300 publications: 26 scientists 301–305 publications: 31 scientists 306–310 publications: 30 scientists 311–315 publications: 21 scientists 316–320 publications: 29 scientists 321–325 publications: 14 scientists 326–330 publications: 15 scientists 331–335 publications: 15 scientists 336–340 publications: 17 scientists 341–345 publications: 15 scientists 346–350 publications: 12 scientists 351–355 publications: 17 scientists 356–360 publications: 18 scientists 361–365 publications: 12 scientists 366–370 publications: 11 scientists 371–375 publications: 6 scientists 376–380 publications: 6 scientists 381–385 publications: 11 scientists 386–390 publications: 9 scientists 391–395 publications: 10 scientists 396–400 publications: 8 scientists 401–405 publications: 4 scientists 406–410 publications: 9 scientists 411–415 publications: 11 scientists 416–420 publications: 4 scientists 421–425 publications: 7 scientists 426–430 publications: 4 scientists 431–435 publications: 3 scientists 436–440 publications: 5 scientists 441–445 publications: 8 scientists 446–450 publications: 6 scientists 451–455 publications: 7 scientists 456–460 publications: 5 scientists 461–465 publications: 6 scientists 466 publications: 2 scientists 467+ publications: 99 scientists
36 publications 467+

This scientist: 123 publications — 42nd percentile

42% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 467 publications or more.

Oula Ghannoum D-index placement in Plant Science and Agronomy in 2026

The chart shows the D-index (discipline H-index) distribution of Plant Science and Agronomy scientists ranked by Research.com in 2026. The highlighted bar marks where Oula Ghannoum sits on this spectrum.

30 D-Index: 200 scientists 31 D-Index: 236 scientists 32 D-Index: 253 scientists 33 D-Index: 283 scientists 34 D-Index: 288 scientists 35 D-Index: 240 scientists 36 D-Index: 246 scientists 37 D-Index: 243 scientists 38 D-Index: 247 scientists 39 D-Index: 229 scientists 40 D-Index: 232 scientists 41 D-Index: 230 scientists 42 D-Index: 228 scientists 43 D-Index: 219 scientists 44 D-Index: 193 scientists 45 D-Index: 164 scientists 46 D-Index: 158 scientists 47 D-Index: 143 scientists 48 D-Index: 131 scientists 49 D-Index: 127 scientists 50 D-Index: 122 scientists 51 D-Index: 122 scientists 52 D-Index: 110 scientists 53 D-Index: 102 scientists 54 D-Index: 98 scientists 55 D-Index: 79 scientists 56 D-Index: 85 scientists 57 D-Index: 88 scientists 58 D-Index: 91 scientists 59 D-Index: 62 scientists 60 D-Index: 61 scientists 61 D-Index: 59 scientists 62 D-Index: 54 scientists 63 D-Index: 61 scientists 64 D-Index: 59 scientists 65 D-Index: 58 scientists 66 D-Index: 41 scientists 67 D-Index: 49 scientists 68 D-Index: 39 scientists 69 D-Index: 32 scientists 70 D-Index: 40 scientists 71 D-Index: 47 scientists 72 D-Index: 38 scientists 73 D-Index: 28 scientists 74 D-Index: 29 scientists 75 D-Index: 28 scientists 76 D-Index: 22 scientists 77 D-Index: 21 scientists 78 D-Index: 25 scientists 79 D-Index: 26 scientists 80 D-Index: 19 scientists 81 D-Index: 16 scientists 82 D-Index: 12 scientists 83 D-Index: 16 scientists 84 D-Index: 14 scientists 85 D-Index: 11 scientists 86 D-Index: 17 scientists 87 D-Index: 13 scientists 88 D-Index: 10 scientists 89 D-Index: 12 scientists 90 D-Index: 18 scientists 91 D-Index: 16 scientists 92 D-Index: 16 scientists 93 D-Index: 17 scientists 94 D-Index: 12 scientists 95 D-Index: 8 scientists 96 D-Index: 9 scientists 97 D-Index: 9 scientists 98 D-Index: 11 scientists 99 D-Index: 12 scientists 100 D-Index: 5 scientists 101 D-Index: 8 scientists 102 D-Index: 4 scientists 103 D-Index: 11 scientists 104 D-Index: 5 scientists 105 D-Index: 9 scientists 106 D-Index: 7 scientists 107 D-Index: 4 scientists 108 D-Index: 8 scientists 109+ D-Index: 99 scientists
30 D-Index 109+

This scientist: 44 D-Index — 55th percentile

55% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 109 D-Index or more.

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

  • C4 photosynthesis and water stress

    Oula Ghannoum

  • Optimal stomatal behaviour around the world

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

  • 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

  • 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

  • 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

  • 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

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

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

  • 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

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

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

  • 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

  • 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

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

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

  • Nitrogen and Water Use Efficiency of C 4 Plants

    Oula Ghannoum;John R. Evans;Susanne von Caemmerer

  • Carbon isotope discrimination as a tool to explore C4 photosynthesis

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

  • 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

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

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

  • 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

  • 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

  • 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

  • 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

Frequent Co-Authors

Jann P. Conroy
Jann P. Conroy Western Sydney University
David T. Tissue
David T. Tissue Western Sydney University
Robert E. Sharwood
Robert E. Sharwood Australian National University
Susanne von Caemmerer
Susanne von Caemmerer Australian National University
James D. Lewis
James D. Lewis Fordham University
Nathan Phillips
Nathan Phillips Boston University
Kristine Y. Crous
Kristine Y. Crous Western Sydney University
David S. Ellsworth
David S. Ellsworth Western Sydney University
Peter B. Reich
Peter B. Reich University of Minnesota
Barry A. Logan
Barry A. Logan Bowdoin College

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