Conservative water management in the widespread conifer genus Callitris

Brodribb, Timothy J.; Bowman, David M. J. S.; Grierson, Pauline F.; Murphy, Brett P.; Nichols, Scott C.; Prior, Lynda D.

doi:10.1093/aobpla/plt052

Cited by 28 publications

(22 citation statements)

References 33 publications

(38 reference statements)

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“…In relation to precipitation, Brodribb et al . (, ) and Drew et al . (, ) have found that larger growth increments are less related to total precipitation over the wet season than to the frequency of rainfall events.…”

Section: Discussionmentioning

confidence: 92%

“…One of the species in this genus, Callitris intratropica , distributed across much of monsoonal Australia, is extremely drought tolerant (Brodribb et al . , ), resilient to termite attack but sensitive to intense fire (Yates & Russell‐Smith ; Russell‐Smith ; Bowman et al . , ).…”

Section: Introductionmentioning

confidence: 99%

“…Further detailed physiological work has noted that although C. intratropica is highly drought tolerant (Brodribb et al . , ), water availability clearly plays a critical role in the addition of annual increment in this species (Baker et al . ; Brodribb et al .…”

Section: Introductionmentioning

confidence: 99%

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Two climate‐sensitive tree‐ring chronologies from Arnhem Land, monsoonal Australia

et al. 2019

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The ecology of the Australian monsoon tropics is fundamentally shaped by dry conditions between May and October followed by highly variable rainfall over the months of November to April. Due to its crucial ecological importance, a better understanding of past hydroclimate variability in the region is of great interest to land managers and custodians in this region. Short instrumental records also make highly resolved terrestrial palaeoclimate records for northern Australia prior to 1900 CE of considerable scientific importance. Here, we present two new well-replicated Callitris intratropica ring-width chronologies from Arnhem Land in northern Australia, one of which extends the tree-ring record in the region by another 86 years, back to 1761. Both chronologies have clearly defined regional patterns of correlations with temperature, precipitation, potential evapotranspiration and two drought indices (the self-calibrating Palmer Drought Severity Index (PDSI) and the Standardised Precipitation Evapotranspiration Index (SPEI)) across the lower latitudes of the Northern Territory. Results indicate considerable scope for hydroclimatic reconstructions based on C. intratropica for transitional periods into and out of the wettest time of the year. This suggests that such reconstructions would reflect variability in the duration of the wet period. While precipitation or streamflow reconstructions may be possible for both these transitional periods, drought reconstructions will be best focused on the months of March-May at the end of the wet period. Hydroclimate reconstructions would provide important baseline information for understanding the rate and magnitude of current regional climate change for these ecologically and culturally important transitional periods.

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Section: Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Two climate‐sensitive tree‐ring chronologies from Arnhem Land, monsoonal Australia

et al. 2019

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“…Detailed meteorological data including air temperature and precipitation over the year for a nearby location are provided by Brodribb et al . (). Gunn Point is characterized by an immense seasonal variation in precipitation, with 85% of mean annual rainfall (∼1850 mm per year) falling in the wet season between November and March, and almost no rainfall between May and September (Cook & Heerdegen ).…”

Section: Methodsmentioning

confidence: 97%

Hormonal dynamics contributes to divergence in seasonal stomatal behaviour in a monsoonal plant community

McAdam

Brodribb

2014

Plant Cell & Environment

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The plant hormone abscisic acid (ABA) is a primary regulator of plant transpiration, but its influence in determining seasonal stomatal behaviour in natural plant communities is poorly understood. We examined distantly related vascular plants growing together in a seasonally dry, monsoonal environment to determine whether ABA dynamics contributed to contrasting water use patterns in this natural setting. Regular sampling of angiosperm, cycad, conifer and fern species revealed characteristic seasonal patterns in ABA production, but these were highly distinct among species. Although no general relationship was observed between ABA levels, plant hydration or stomatal conductance among species, the seasonal dynamics in stomatal behaviour within species were predictable functions of either ABA or leaf water potential. Strong divergence in the seasonal role of ABA among species suggests that modification in ABA-stomatal interactions represents an important evolutionary pathway for adaptation in plant water use.

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“…Callitris as a genus, in general, has a very conservative water management strategy with an anisohydric (delayed closing) stomatal response to soil drying and is one of the most stress‐resistant tree genera known (Brodribb et al. ). In the investigated Callitris ‐species the rainforest associated C .…”

Section: Discussionmentioning

confidence: 99%

The foliar characters in Callitris (Callitroideae, Cupressaceae s. str.) and their evolutionary and ecological significance

2019

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The foliar shift from juvenile needle leaves to the mature scale leaves was investigated in five Callitris species. Their habitats range from rainforest to the semi‐arid. In C. macleayana from the most mesic environment the change from needle to scale leaves is variable and juvenile leave are even retained on mature trees. In the other four species there is a rapid change in size and structure to scale leaves. Anatomically the photosynthetic tissue is condensed and stomatal area is limited compared to species with conventional leaves. A hypodermis is most prominent on the abaxial side of the leaves and may play a role in protection from high solar radiation as most species grow in high light areas. While stomata in the four taxa from wet or moderate rainfall areas are freely exposed, those of C. gracilis from semi‐arid habitats are well protected in longitudinal furrows between the decurrent leaves. The reduced leaf area of all species allows close association between the water‐conducting xylem and the stomata that will facilitate rapid leaf conductance. This links with the anisohydric physiology of the genus and the shallow rooting that can take advantage of brief rainfall events for species in arid climates.

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Conservative water management in the widespread conifer genus Callitris

Cited by 28 publications

References 33 publications

Two climate‐sensitive tree‐ring chronologies from Arnhem Land, monsoonal Australia

Two climate‐sensitive tree‐ring chronologies from Arnhem Land, monsoonal Australia

Hormonal dynamics contributes to divergence in seasonal stomatal behaviour in a monsoonal plant community

The foliar characters in Callitris (Callitroideae, Cupressaceae s. str.) and their evolutionary and ecological significance

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