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D-Index & Metrics

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

Oula Ghannoum publications per year

The chart shows the history of publications by Oula Ghannoum between 1997 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Oula Ghannoum published across 29 years, from 1997 to 2025, averaging 4.7 papers a year. Output peaked at 11 publications in 2022. 20 of the 137 publications appeared in the last two years.

No. of publications
2 4 6 8 10
Bar chart. Horizontal axis: year, 1997 to 2025. Vertical axis: number of publications, 0 to 11. Peak 11 publications in 2022. 1997: 1 publication 1998: 3 publications 1999: 2 publications 2000: 1 publication 2001: 8 publications 2002: 3 publications 2003: 3 publications 2004: 1 publication 2005: 1 publication 2006: 0 publications 2007: 3 publications 2008: 2 publications 2009: 0 publications 2010: 6 publications 2011: 4 publications 2012: 2 publications 2013: 5 publications 2014: 6 publications 2015: 3 publications 2016: 7 publications 2017: 6 publications 2018: 4 publications 2019: 10 publications 2020: 5 publications 2021: 10 publications 2022: 11 publications 2023: 10 publications 2024: 10 publications 2025: 10 publications
1997 2025

137 publications in total across all disciplines

View publications per year as a table
Oula Ghannoum: publications per year, 1997 to 2025
Year Publications
1997 1
1998 3
1999 2
2000 1
2001 8
2002 3
2003 3
2004 1
2005 1
2006 0
2007 3
2008 2
2009 0
2010 6
2011 4
2012 2
2013 5
2014 6
2015 3
2016 7
2017 6
2018 4
2019 10
2020 5
2021 10
2022 11
2023 10
2024 10
2025 10
Total 137
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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.

No. of scientists
50 100 150 200 250
Bar chart with 88 bars. Horizontal axis: publications, 36–40 to 467+. Vertical axis: number of scientists, 0 to 255. Most scientists, 255, have 111–115 publications. The last bar groups every scientist with 467 publications or more. The highlighted bar, 121–125 publications, is where this scientist sits. 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
36–40 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.

View publications distribution as a table
Number of Plant Science and Agronomy scientists by publication count, Research.com 2026 ranking edition. Based on 6,494 ranked scientists.
Publications Scientists This scientist
36–40 2
41–45 7
46–50 40
51–55 58
56–60 60
61–65 107
66–70 130
71–75 153
76–80 191
81–85 199
86–90 206
91–95 218
96–100 226
101–105 227
106–110 247
111–115 255
116–120 253
121–125 233 123
126–130 219
131–135 201
136–140 194
141–145 176
146–150 157
151–155 147
156–160 151
161–165 159
166–170 137
171–175 128
176–180 126
181–185 98
186–190 114
191–195 100
196–200 90
201–205 71
206–210 98
211–215 70
216–220 86
221–225 61
226–230 58
231–235 53
236–240 64
241–245 39
246–250 46
251–255 51
256–260 36
261–265 44
266–270 35
271–275 30
276–280 33
281–285 35
286–290 36
291–295 26
296–300 26
301–305 31
306–310 30
311–315 21
316–320 29
321–325 14
326–330 15
331–335 15
336–340 17
341–345 15
346–350 12
351–355 17
356–360 18
361–365 12
366–370 11
371–375 6
376–380 6
381–385 11
386–390 9
391–395 10
396–400 8
401–405 4
406–410 9
411–415 11
416–420 4
421–425 7
426–430 4
431–435 3
436–440 5
441–445 8
446–450 6
451–455 7
456–460 5
461–465 6
466 2
467+ 99
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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.

No. of scientists
50 100 150 200 250
Bar chart with 80 bars. Horizontal axis: D-Index, 30 to 109+. Vertical axis: number of scientists, 0 to 288. Most scientists, 288, have 34 D-Index. The last bar groups every scientist with 109 D-Index or more. The highlighted bar, 44 D-Index, is where this scientist sits. 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.

View D-Index distribution as a table
Number of Plant Science and Agronomy scientists by D-index, Research.com 2026 ranking edition. Based on 6,494 ranked scientists.
D-Index Scientists This scientist
30 200
31 236
32 253
33 283
34 288
35 240
36 246
37 243
38 247
39 229
40 232
41 230
42 228
43 219
44 193 44
45 164
46 158
47 143
48 131
49 127
50 122
51 122
52 110
53 102
54 98
55 79
56 85
57 88
58 91
59 62
60 61
61 59
62 54
63 61
64 59
65 58
66 41
67 49
68 39
69 32
70 40
71 47
72 38
73 28
74 29
75 28
76 22
77 21
78 25
79 26
80 19
81 16
82 12
83 16
84 14
85 11
86 17
87 13
88 10
89 12
90 18
91 16
92 16
93 17
94 12
95 8
96 9
97 9
98 11
99 12
100 5
101 8
102 4
103 11
104 5
105 9
106 7
107 4
108 8
109+ 99
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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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