Stoichiometry patterns in the androdioecious Acer tegmentosum

Zhang, Xinna; Yao, Jian; Fan, Chunyu; Tan, Liangcheng; Zhang, Chunyu; Wang, Juan; Zhao, Xiuhai; Gadow, Klaus von

doi:10.1038/srep35022

Cited by 2 publications

(2 citation statements)

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“…We used standardized major axis regression (SMA; sma function within smatr R package) to test for significant differences between watering treatments in biomass allocation to different components. SMA is a procedure for assessing heterogeneity of regression slopes which characterizes the best fit bivariate line between two variables (Warton, Duursma, Falster, & Taskinen, ; Zhang et al, ). The data set used for this study is publicly available (Drake, Vårhammar, et al, ) and the analysis code to reproduce all the results, including the figures and tables, is available at https://bitbucket.org/Kumarathunge/great-drought.…”

Section: Methodsmentioning

confidence: 99%

The temperature optima for tree seedling photosynthesis and growth depend on water inputs

Kumarathunge

Drake

Tjoelker

et al. 2020

Global Change Biology

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Understanding how tree growth is affected by rising temperature is a key to predicting the fate of forests in future warmer climates. Increasing temperature has direct effects on plant physiology, but there are also indirect effects of increased water limitation because evaporative demand increases with temperature in many systems. In this study, we experimentally resolved the direct and indirect effects of temperature on the response of growth and photosynthesis of the widely distributed species Eucalyptus tereticornis. We grew E. tereticornis in an array of six growth temperatures from 18 to 35.5°C, spanning the climatic distribution of the species, with two watering treatments: (a) water inputs increasing with temperature to match plant demand at all temperatures (Wincr), isolating the direct effect of temperature; and (b) water inputs constant for all temperatures, matching demand for coolest grown plants (Wconst), such that water limitation increased with growth temperature. We found that constant water inputs resulted in a reduction of temperature optima for both photosynthesis and growth by ~3°C compared to increasing water inputs. Water limitation particularly reduced the total amount of leaf area displayed at Topt and intermediate growth temperatures. The reduction in photosynthesis could be attributed to lower leaf water potential and consequent stomatal closure. The reduction in growth was a result of decreased photosynthesis, reduced total leaf area display and a reduction in specific leaf area. Water availability had no effect on the response of stem and root respiration to warming, but we observed lower leaf respiration rates under constant water inputs compared to increasing water inputs at higher growth temperatures. Overall, this study demonstrates that the indirect effect of increasing water limitation strongly modifies the potential response of tree growth to rising global temperatures.

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Section: Methodsmentioning

confidence: 99%

The temperature optima for tree seedling photosynthesis and growth depend on water inputs

Kumarathunge

Drake

Tjoelker

et al. 2020

Global Change Biology

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“…An experiment in Populus cathayana also showed that males had lower N:P ratios than females under equally P‐deficient treatments (Zhang et al, 2014). Likewise, a study regarding the androdioecious plant, Acer tegmentosum , revealed that the scaling slope for foliar P vs. N was steeper in males than in hermaphrodites (Zhang et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Sex‐specific scaling of leaf phosphorus vs. nitrogen under unequal reproductive requirements in Eurya japonica, a dioecious plant

He,

Liu,

Zheng

2024

American J of Botany

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PremisePrevious work searching for sexual dimorphism has largely relied on the comparison of trait mean vectors between sexes in dioecious plants. Whether trait scaling (i.e., the ratio of proportional changes in covarying traits) differs between sexes, along with its functional significance, remains unclear.MethodsWe measured 10 vegetative traits pertaining to carbon, water, and nutrient economics across 337 individuals (157 males and 180 females) of the diocious species Eurya japonica during the fruiting season in eastern China. Piecewise structural equation modeling was employed to reveal the scaling relationships of multiple interacting traits, and multivariate analysis of (co)variance was conducted to test for intersexual differences.ResultsThere was no sexual dimorphism in terms of trait mean vectors across the 10 vegetative traits in E. japonica. Moreover, most relationships for covarying trait pairs (17 out of 19) exhibited common scaling slopes between sexes. However, the scaling slopes for leaf phosphorus (P) vs. nitrogen (N) differed between sexes, with 5.6‐ and 3.0‐fold increases of P coinciding with a 10‐fold increase of N in male and female plants, respectively.ConclusionsThe lower ratio of proportional changes in P vs. N for females likely reflects stronger P limitation for their vegetative growth, as they require greater P investments in fruiting. Therefore, P vs. N scaling can be a key avenue allowing for sex‐specific strategic optimization under unequal reproductive requirements. This study uncovers a hidden aspect of secondary sex character in dioecious plants, and highlights the use of trait scaling to understand sex‐defined economic strategies.

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Stoichiometry patterns in the androdioecious Acer tegmentosum

Cited by 2 publications

References 58 publications

The temperature optima for tree seedling photosynthesis and growth depend on water inputs

The temperature optima for tree seedling photosynthesis and growth depend on water inputs

Sex‐specific scaling of leaf phosphorus vs. nitrogen under unequal reproductive requirements in Eurya japonica, a dioecious plant

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