World's Best Scientists 2026 revealed!

D-Index & Metrics

Plant Science and Agronomy

D-Index
56
Citations
8575
World Ranking
1566
National Ranking
65

Robert D. Guy 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 Robert D. Guy 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: 157 publications — 61st percentile

61% of scientists in this discipline score the same or lower.

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

Robert D. Guy 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 Robert D. Guy 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: 56 D-Index — 77th percentile

77% 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:

  • Botany
  • Ecology
  • Gene

Robert D. Guy focuses on Botany, Genetics, Ecology, Water-use efficiency and Growing season. The study of Botany is intertwined with the study of Horticulture in a number of ways. His Horticulture research is multidisciplinary, incorporating perspectives in Halophyte, Salinity, Salicornia europaea, δ13C and Transect.

In the field of Ecology, his study on Phenology and Ecosystem overlaps with subjects such as Pseudotsuga menziesii var. glauca, Ectosymbiosis and Ectomycorrhiza. Robert D. Guy combines subjects such as Photosynthetic capacity, Biomass and Drought tolerance with his study of Water-use efficiency. His Stomatal conductance research includes themes of Field experiment and Dry matter.

His most cited work include:

  • Photosynthetic Fractionation of the Stable Isotopes of Oxygen and Carbon. (343 citations)
  • The use of remote sensing in light use efficiency based models of gross primary production: a review of current status and future requirements. (198 citations)
  • Differential fractionation of oxygen isotopes by cyanide-resistant and cyanide-sensitive respiration in plants. (185 citations)

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

His primary areas of study are Botany, Photosynthesis, Populus trichocarpa, Horticulture and Stomatal conductance. All of his Botany and Shoot, Growing season, Populus balsamifera, Water-use efficiency and Seedling investigations are sub-components of the entire Botany study. His work deals with themes such as Chloroplast, Chlorophyll and Plant physiology, which intersect with Photosynthesis.

He has included themes like Ecology, Geographic variation and Genomics in his Populus trichocarpa study. His Dry weight study in the realm of Horticulture connects with subjects such as Cold storage. His Stomatal conductance study combines topics from a wide range of disciplines, such as Salinity, Photosynthetic capacity, Xylem, Thuja and Transpiration.

He most often published in these fields:

  • Botany (53.91%)
  • Photosynthesis (21.74%)
  • Populus trichocarpa (20.00%)

What were the highlights of his more recent work (between 2015-2021)?

  • Photosynthesis (21.74%)
  • Botany (53.91%)
  • Horticulture (18.26%)

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

His main research concerns Photosynthesis, Botany, Horticulture, Populus trichocarpa and Populus balsamifera. His Photosynthesis research includes elements of Chloroplast, Carbonic anhydrase and Plant physiology. As part of the same scientific family, he usually focuses on Botany, concentrating on Animal science and intersecting with Isotopes of carbon.

His Heterosis study, which is part of a larger body of work in Horticulture, is frequently linked to Treatment regimen, bridging the gap between disciplines. His studies in Populus trichocarpa integrate themes in fields like Perennial plant, Woody plant, Genomics, Xylem and Annual growth cycle of grapevines. Robert D. Guy focuses mostly in the field of Populus balsamifera, narrowing it down to matters related to Isotopes of nitrogen and, in some cases, Agronomy, Genetic variation and Nitrogen assimilation.

Between 2015 and 2021, his most popular works were:

  • Substantial role for carbonic anhydrase in latitudinal variation in mesophyll conductance of Populus trichocarpa Torr. & Gray. (30 citations)
  • Leaf mass per area predicts palisade structural properties linked to mesophyll conductance in balsam poplar (Populus balsamifera L.) (25 citations)
  • Sexual homomorphism in dioecious trees: extensive tests fail to detect sexual dimorphism in Populus (†). (24 citations)

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

  • Botany
  • Ecology
  • Gene

Robert D. Guy spends much of his time researching Botany, Chloroplast, Stomatal conductance, Populus trichocarpa and Photosynthesis. While working in this field, Robert D. Guy studies both Botany and Conductance. The study incorporates disciplines such as Isotopes of carbon, Photosynthetic capacity, Carbonic anhydrase, Chlorophyll fluorescence and Animal science in addition to Chloroplast.

Robert D. Guy interconnects Xylem, Locus, Allele, Genetic association and Abiotic component in the investigation of issues within Stomatal conductance. His Populus trichocarpa study combines topics in areas such as Temperate climate, Woody plant, Phenology, Genomics and Annual growth cycle of grapevines. Robert D. Guy undertakes interdisciplinary study in the fields of Photosynthesis and Acetazolamide through his research.

Best Publications

  • Photosynthetic Fractionation of the Stable Isotopes of Oxygen and Carbon.

    Robert D. Guy;Marilyn L. Fogel;Joseph A. Berry

  • The use of remote sensing in light use efficiency based models of gross primary production: a review of current status and future requirements.

    Thomas Hilker;Nicholas C. Coops;Michael A. Wulder;T. Andrew Black

  • The effects of nitrogen stress on the stable carbon isotope composition, productivity and water use efficiency of white spruce (Picea glauca (Moench) Voss) seedlings

    N. J. Livingston;R. D. Guy;Z. J. Sun;G. J. Ethier

  • Geographical and environmental gradients shape phenotypic trait variation and genetic structure in Populus trichocarpa

    Athena D. McKown;Robert D. Guy;Jaroslav Klápště;Jaroslav Klápště;Armando Geraldes

  • Differential fractionation of oxygen isotopes by cyanide-resistant and cyanide-sensitive respiration in plants.

    Robert D. Guy;Joseph A. Berry;Marilyn L. Fogel;Thomas C. Hoering

  • Genome‐wide association implicates numerous genes underlying ecological trait variation in natural populations of Populus trichocarpa

    Athena D. McKown;Jaroslav Klápště;Jaroslav Klápště;Robert D. Guy;Armando Geraldes

  • Enhanced assimilation rate and water use efficiency with latitude through increased photosynthetic capacity and internal conductance in balsam poplar (Populus balsamifera L.)

    Raju Y. Soolanayakanahally;Robert D. Guy;Salim N. Silim;Eric C. Drewes

  • Access to mycorrhizal networks and roots of trees: importance for seedling survival and resource transfer

    François P. Teste;Suzanne W. Simard;Daniel M. Durall;Robert D. Guy

  • Stable carbon isotopes as indicators of increased water use efficiency and productivity in white spruce (Picea glauca (Moench) Voss) seedlings

    Z. J. Sun;N. J. Livingston;R. D. Guy;G. J. Ethier

  • Genome‐wide association mapping for wood characteristics in Populus identifies an array of candidate single nucleotide polymorphisms

    Ilga Porth;Jaroslav Klapšte;Jaroslav Klapšte;Oleksandr Skyba;Jan Hannemann

  • Perturbed Lignification Impacts Tree Growth in Hybrid Poplar—A Function of Sink Strength, Vascular Integrity, and Photosynthetic Assimilation

    Heather D. Coleman;A. Lacey Samuels;Robert D. Guy;Shawn D. Mansfield

  • Shifts in carbon isotope ratios of two C3 halophytes under natural and artificial conditions.

    Robert D. Guy;David M. Reid;H. Roy Krouse

  • Whole-plant nitrogen- and water-relations traits, and their associated trade-offs, in adjacent muskeg and upland boreal spruce species.

    T. B. Patterson;R. D. Guy;Q. L. Dang

  • Recent Y chromosome divergence despite ancient origin of dioecy in poplars (Populus)

    A. Geraldes;C. A. Hefer;A. Capron;N. Kolosova

  • Climate-driven local adaptation of ecophysiology and phenology in balsam poplar, Populus balsamifera L. (Salicaceae).

    Stephen R. Keller;Raju Y. Soolanayakanahally;Raju Y. Soolanayakanahally;Robert D. Guy;Salim N. Silim

  • Landscape genomics of Populus trichocarpa: the role of hybridization, limited gene flow, and natural selection in shaping patterns of population structure.

    Armando Geraldes;Nima Farzaneh;Christopher J. Grassa;Athena D. McKown

  • Association genetics, geography and ecophysiology link stomatal patterning in Populus trichocarpa with carbon gain and disease resistance trade-offs.

    Athena D. McKown;Robert D. Guy;Linda Quamme;Jaroslav Klápště;Jaroslav Klápště

  • Induction of nitrate uptake and nitrate reductase activity in trembling aspen and lodgepole pine

    X. Min;M. Y. Siddiqi;R. D. Guy;A. D. M. Glass

  • A 34K SNP genotyping array for Populus trichocarpa: Design, application to the study of natural populations and transferability to other Populus species

    A. Geraldes;S. P. DiFazio;G. T. Slavov;G. T. Slavov;P. Ranjan

  • Investigating the drought-stress response of hybrid poplar genotypes by metabolite profiling.

    Genoa L H Barchet;Rebecca Dauwe;Robert D Guy;William R Schroeder

  • The adaptive potential of Populus balsamifera L. to phenology requirements in a warmer global climate.

    Matthew S. Olson;Matthew S. Olson;Nicholas Levsen;Raju Y. Soolanayakanahally;Robert D. Guy

  • Geographic variation in ecophysiological traits of black cottonwood (Populus trichocarpa)This article is one of a selection of papers published in the Special Issue on Poplar Research in Canada.

    Jemma L. GornallJ.L. Gornall;Jemma L. GornallJ.L. Gornall;Robert D. GuyR.D. Guy;Robert D. GuyR.D. Guy

  • A comparative kinetic analysis of nitrate and ammonium influx in two early‐successional tree species of temperate and boreal forest ecosystems

    Xiangjia Min;M. Yaeesh Siddiqi;Robert D. Guy;Anthony D. M. Glass

  • Partitioning of respiratory electrons in the dark in leaves of transgenic tobacco with modified levels of alternative oxidase

    Robert D. Guy;Greg C. Vanlerberghe

  • Significance of Phosphoenolpyruvate Carboxylase during Ammonium Assimilation: Carbon Isotope Discrimination in Photosynthesis and Respiration by the N-Limited Green Alga Selenastrum minutum.

    Robert D. Guy;Greg C. Vanlerberghe;David H. Turpin

  • Seasonality and phenology alter functional leaf traits

    Athena D. McKown;Robert D. Guy;M. Shofiul Azam;Eric C. Drewes

  • Timing of photoperiodic competency causes phenological mismatch in balsam poplar (Populus balsamifera L.)

    Raju Y. Soolanayakanahally;Robert D. Guy;Salim N. Silim;Minghua Song

  • A comparative study of fluxes and compartmentation of nitrate and ammonium in early‐successional tree species

    X. Min;M. Yaeesh Siddiqi;R. D. Guy;A. D. M. Glass

Frequent Co-Authors

Shawn D. Mansfield
Shawn D. Mansfield University of British Columbia
Yousry A. El-Kassaby
Yousry A. El-Kassaby University of British Columbia
Carl J. Douglas
Carl J. Douglas University of British Columbia
Quentin C. B. Cronk
Quentin C. B. Cronk University of British Columbia
Richard C. Hamelin
Richard C. Hamelin University of British Columbia
Suzanne W. Simard
Suzanne W. Simard University of British Columbia
David M. Reid
David M. Reid University of Calgary
David H. Turpin
David H. Turpin University of Victoria
Herbert J. Kronzucker
Herbert J. Kronzucker University of British Columbia
Gerald A. Tuskan
Gerald A. Tuskan Oak Ridge National Laboratory

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