Year: 2013

Hydraulic tuning of vein cell microstructure in the evolution of angiosperm venation networks

Feild, T. S. and Brodribb, T. J. (2013), Hydraulic tuning of vein cell microstructure in the evolution of angiosperm venation networks. New Phytol, 199: 720–726. doi:10.1111/nph.12311

Summary High vein density (DV) evolution in angiosperms represented a key functional transition. Yet, a mechanistic account on how this hydraulic transformation evolved remains lacking. We demonstrate that a consequence of producing high DV is that veins must become very…

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Improving the estimation of mesophyll conductance to CO2: on the role of electron transport rate correction and respiration.

Martins, S. C. V, Galmés, J., Molins, A., & DaMatta, F. M. (2013). Improving the estimation of mesophyll conductance to CO₂: on the role of electron transport rate correction and respiration. Journal of Experimental Botany, 64(11), 3285–98.

Mesophyll conductance (gm) can markedly limit photosynthetic CO2 assimilation and is required to estimate the parameters of the Farquhar–von Caemmerer–Berry (FvCB) model properly. The variable J (electron transport rate) is the most frequently used method for estimating gm,…

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Conservative water management in the widespread conifer genus Callitris

Brodribb T, Bowman DMJS, Grierson P, Murphy BP, Nichols S, Prior LD (2013) Conservative water management in the widespread conifer genus Callitris. AoB PLANTS 5, plt052

Water management by woody species encompasses characters involved in seeking, transporting and evaporating water. Examples of adaptation of individual characters to water availability are common, but little is known about the adaptability of whole-plant water management. Here we…

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From desert to rainforest, sapwood width is similar in the widespread conifer Callitris columellaris

Prior, LD and Brodribb, TJ and Tng, DYP and Bowman, DMJS, From desert to rainforest, sapwood width is similar in the widespread conifer Callitris columellaris, Trees: Structure and function, 27, (1) pp. 123-129.

The process that transforms conductive sapwood to non-conductive heartwood in trees is poorly understood. Here, we use natural variation in climate to examine the environmental control of sapwood width in a widespread conifer species. We hypothesised that if…

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Unique Responsiveness of Angiosperm Stomata to Elevated CO2 Explained by Calcium Signalling

Brodribb TJ, McAdam SAM (2013) Unique Responsiveness of Angiosperm Stomata to Elevated CO2 Explained by Calcium Signalling. PLoS ONE 8(11):

Angiosperm and conifer tree species respond differently when exposed to elevated CO2, with angiosperms found to dynamically reduce water loss while conifers appear insensitive. Such distinct responses are likely to affect competition between these tree groups as atmospheric…

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Abscisic Acid Mediates a Divergence in the Drought Response of Two Conifers

Brodribb TJ, McAdam SAM (2013) Abscisic acid mediates a divergence in the drought response of two conifers. Plant Physiology 162, 1370–1377.

During water stress, stomatal closure occurs as water tension and levels of abscisic acid (ABA) increase in the leaf, but the interaction between these two drivers of stomatal aperture is poorly understood. We investigate the dynamics of water…

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Stem hydraulic traits and leaf water-stress tolerance are co-ordinated with the leaf phenology of angiosperm trees in an Asian tropical dry karst forest

Pei-Li Fu, Yan-Juan Jiang, Ai-Ying Wang, Tim J. Brodribb, Jiao-Lin Zhang, Shi-Dan Zhu & Kun-Fang Cao. 2012, Stem hydraulic traits and leaf water-stress tolerance are coordinated with the leaf phenology of angiosperm trees in an Asian tropical dry karst forest. Annals of Botany,110:189-199.

Background and Aims:   The co-occurring of evergreen and deciduous angiosperm trees in Asian tropical dry forests on karst substrates suggests the existence of different water-use strategies among species. In this study it is hypothesized that the co-occurring…

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Ancestral stomatal control results in a canalization of fern and lycophyte adaptation to drought

Scott A. M. McAdam, Timothy J. Brodribb. (2013) Ancestral stomatal control results in a canalization of fern and lycophyte adaptation to drought. New Phytologist 198:2, 429-441

 Little is known about how a predominantly passive hydraulic stomatal control in ferns and lycophytes might impact water use under stress. Ferns and lycophytes occupy a diverse array of habitats, from deserts to rainforest canopies, raising the…

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Unified changes in cell size permit coordinated leaf evolution

Brodribb TJ, Jordan GJ, Carpenter RJ (2013). Unified changes in cell size permit co-ordinated leaf evolution. New Phytologist 199, 559-570.

 The processes by which the functions of interdependent tissues are coordinated as lineages diversify are poorly understood.  Here, we examine evolutionary coordination of vascular, epidermal and cortical leaf tissues in the anatomically, ecologically and morphologically diverse woody…

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Xylem cavitation vulnerability influences tree species’ habitat preferences in miombo woodlands

Vinya R., Malhi Y., Fisher J.B., Brown N., Brodribb T.J., Aragao L.E. (2013) Xylem cavitation vulnerability influences tree species’ habitat preferences in miombo woodlands Oecologia 173:711–720

Although precipitation plays a central role in structuring Africa’s miombo woodlands, remarkably little is known about plant-water relations in this seasonally dry tropical forest. Therefore, in this study, we investigated xylem vulnerability to cavitation for nine principal tree…

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