Publications

2023
Johnson, Kate M, Sophie R Everbach, N. Michele Holbrook, and Mark E Olson. 2023. “Evaluating Carlquist’s Law from a physiological perspective.” IAWA Journal. Publisher's Version Abstract
“Carlquist’s Law” is a striking pattern of association between anatomical features in the wood of vessel-bearing plants. It derives from Sherwin Carlquist’s observation that xylem vessels tend to be solitary when embedded in a matrix of imperforate tracheary elements that appear to be conductive, whereas xylem vessels tend to be grouped when surrounded by seemingly non-conductive cells. Vessel-vessel contacts (vessel grouping) allow water to travel between conduits, but also provide pathways for air to propagate from embolized (air-filled) vessels into functional vessels. If the background matrix is conductive, it is conceivable that water could bypass embolized vessels, providing an alternative transport route in species with conductive backgrounds and solitary vessels. Much remains to be tested in this hypothesis, including the topology of the vessel networks in species with solitary versus grouped vessels and how conductive the different imperforate tracheary element types are. Exploring Carlquist’s Law promises to provide key insight into the causes of embolism in plant conduits, the modes of embolism passage between conduits, and how vessels and the cells in which they are imbedded may interact to govern the pathways of water flow through plants.
iawa_advance_2255_johnson.pdf
2022
Losada, Juan M, Zhe He, and N. Michele Holbrook. 2022. “Sieve tube structural variation in Austrobaileya scandens and its significance for lianescence.” Plant, Cell & Environment 45 (7): 2460-2475. Publisher's Version Abstract
Lianas combine large leaf areas with slender stems, features that require an efficient vascular system. The only extant member of the Austrobaileyaceae is an endemic twining liana of the tropical Australian forests with well-known xylem hydraulics, but the vascular phloem continuum aboveground remains understudied. Microscopy analysis across leaf vein orders and stems of Austrobaileya scandens revealed a low foliar xylem:phloem ratio, with isodiametric vascular elements along the midrib, but tapered across vein orders. Sieve plate pore radii increased from 0.08 µm in minor veins to 0.12 µm in the petiole, but only to 0.20 µm at the stem base, tens of metres away. In easily bent searcher branches, phloem conduits have pectin-rich walls and simple plates, whereas in twining stems, conduits were connected through highly angled and densely porated sieve plates. The hydraulic resistance of phloem conduits in the twisted and elongated stems of A. scandens is large compared with trees of similar stature; phloem hydraulic resistance decreases from leaves to stems, consistent with the efficient delivery of photoassimilates from sources under Münch predictions. Sink strength of a continuously growing canopy might be stronger than in self-supporting understory plants, favoring resource allocation to aerial organs and the attainment of vertical stature.
plant_cell_environment_-_2022_-_losada.pdf
2021
Mai, Melissa H, and N. Michele Holbrook. 2021. “A tale to astonish: Ant-Man at the plasmodesmal gates.” Journal of Plant Physiology 261. Publisher's Version
mai2021_pdcommentary.pdf
2020
Losada, J.M., M. Díaz, and N. M. Holbrook. 2020. “Idioblasts and peltate hairs as distribution networks for water absorbed by xerophilous leaves.” Plant Cell Environ, 1– 15. Publisher's Version
pce.13985.pdf
Rigden, A.J., N.D. Mueller, N. M. Holbrook, N. Pillai, and P. Huybers. 2020. “Combined influence of soil moisture and atmospheric evaporative demand is important for accurately predicting US maize yields .” Nature Food 1: 127-133.
s43016-020-0028-7.pdf
Clerx, L.E., F.E. Rockwell, J.A. Savage, and N. M. Holbrook. 2020. “Ontogenetic scaling of phloem sieve tube hydraulic resistance with tree height in Quercus rubra.” American Journal of Botany 107: 852-863.
ajb2.1481.pdf
Brodribb, T. J., M. Carriqui, S. Delzon, S.A.M. McAdam, and N. M. Holbrook. 2020. “Advanced vascular function discovered in a widespread moss.” Nature Plants 6: 273-279.
s41477-020-0602-x.pdf
Gersony, J.T., U. Hochberg, F.E. Rockwell, M. Park, P.P. Gauthier, and N. M. Holbrook. 2020. “Leaf carbon export and non-structural carbohydrates in relation to diurnal water dynamics in mature oak trees.” Plant Physiology 183: 1612–1621.
1612.full_.pdf
Ziemińska, K, E Rosa, SM Gleason, and N. M. Holbrook. 2020. “Wood day capacitance is related to water content, wood density, and anatomy across 30 temperate tree species.” Plant, Cell & Environment 43: 3048– 3067. Publisher's Version
pce.13891.pdf
2019
Losada, J., and N. M. Holbrook. 2019. “Scaling of phloem hydraulic resistance in stems and leaves of the understory angiosperm shrub Illicium parviflorum (Illiciaceae).” American Journal of Botany 106: 244-259.
ajb2.1241.pdf
Hochberg, U., A. Ponomarenko, Y.-J. Zhang, F.E. Rockwell, and N. M. Holbrook. 2019. “Visualizing embolism propagation in gas-injected leaves.” Plant Physiology 180: 874-881.
874.full_.pdf
2018
Huggett, Brett A., Jessica A. Savage, Guang-You Hao, Evan L. Preisser, and N. Michele Holbrook. 2018. “Impact of hemlock woolly adelgid (Adelges tsugae) infestation on xylem structure and function and leaf physiologyin eastern hemlock (Tsuga canadensis).” Functional Plant Biology 45: 501–508. Publisher's Version
fp17233.pdf
Rockwell, Fulton E, Jessica T Gersony, and Michele N Holbrook. 2018. “Where does Münch flow begin? Sucrose transport in the pre-phloem path.” Current Opinion in Plant Biology 43: 101-107. Publisher's Version
1-s2.0-s1369526617301760-main.pdf
Holbrook, N. Michele, and Michael Knoblauch. 2018. “Physiology and metabolism: Phloem: a supracellular highway for the transport of sugars, signals, and pathogens.” Current Opinion in Plant Biology 43: iii-vii. Publisher's Version
1-s2.0-s1369526618300591-main_1.pdf
Hao, Guang-You, N. Michele Holbrook, Maciej A. Zwieniecki, Vincent P. Gutschick, and Hormoz BassiriRad. 2018. “Coordinated responses of plant hydraulic architecture with the reduction of stomatal conductance under elevated CO2 concentration.” Tree Physiology 38 (7): 1041–1052. Publisher's Version
tpy001.pdf
UriHochberg,, Fulton E. Rockwell, N. Michele Holbrook, and Hervé Cochard. 2018. “Iso/Anisohydry: A Plant–Environment Interaction Rather Than a Simple Hydraulic Trait.” Trends in Plant Science 23 (2): 112-120.
1-s2.0-s1360138517302546-main.pdf
QiangTie,, Hongchang Hu, Fuqiang Tian, and N. Michele Holbrook. 2018. “Comparing different methods for determining forest evapotranspiration and its components at multiple temporal scales.” Science of The Total Environment 633: 12-29.
1-s2.0-s0048969718308362-main.pdf
2017
Hochberg, U., A. Ponomarenko, F.E. Rockwell, and N. M. Holbrook. 2017. “Stomatal Closure, Basal Leaf Embolism, and Shedding Protect the Hydraulic Integrity of Grape Stems.” Plant Physiology 174: 764-775.
764.full_.pdf
Zhang, W.-W., J. Song, M. Wang, Y.-Y. Liu, Y.-J. Zhang, N. M. Holbrook, and G.-Y. Hao. 2017. “Divergences in hydraulic architecture form an important basis for niche differentiations between diploid and polyploid Betula species in NE China.” Tree Physiology 37: 604-616.
tpx004.pdf
Mueller, N.D., A. Rhines, D.K. Ray, S. Siebert, N. M. Holbrook, and P. Huybers. 2017. “Global relationships between cropland intensification and summer temperature extremes over the last 50 years.” Journal of Climate 30: 7505-7528.
15200442_-_jcg_cropland_intensification_summer_temp_extremes.pdf

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