Leaf nitrogen from the perspective of optimal plant function

Journal of Ecology, Год журнала: 2022, Номер 110(11), С. 2585 - 2602

Опубликована: Июль 18, 2022

Leaf dry mass per unit area (LMA), carboxylation capacity (

Язык: Английский

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Plant water use theory should incorporate hypotheses about extreme environments, population ecology, and community ecology

New Phytologist, Год журнала: 2023, Номер 238(6), С. 2271 - 2283

Опубликована: Фев. 8, 2023

Summary Plant water use theory has largely been developed within a plant‐performance paradigm that conceptualizes in terms of value for carbon gain and sits neoclassical economic framework. This works very well many contexts but does not consider other values to plants could impact their fitness. Here, we survey range alternative hypotheses drivers stomatal regulation. These are organized around relevance extreme environments, population ecology, community ecology. Most these yet empirically tested some controversial (e.g. requiring more agency behavior than is commonly believed possible plants). Some hypotheses, especially those focused using avoid thermal stress, promote reproduction instead growth, hoard it, may be useful incorporate into or implement Earth System Models.

Язык: Английский

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Soil nitrogen fertilization reduces relative leaf nitrogen allocation to photosynthesis

Journal of Experimental Botany, Год журнала: 2023, Номер 74(17), С. 5166 - 5180

Опубликована: Май 26, 2023

Abstract The connection between soil nitrogen availability, leaf nitrogen, and photosynthetic capacity is not perfectly understood. Because these three components tend to be positively related over large spatial scales, some posit that drives which capacity. Alternatively, others primarily driven by above-ground conditions. Here, we examined the physiological responses of a non-nitrogen-fixing plant (Gossypium hirsutum) nitrogen-fixing (Glycine max) in fully factorial combination light availability help reconcile competing hypotheses. Soil stimulated both species, but relative proportion used for processes was reduced under elevated all treatments due greater increases content than chlorophyll biochemical process rates. Leaf rates G. hirsutum were more responsive changes those max, probably strong max investments root nodulation low nitrogen. Nonetheless, whole-plant growth significantly enhanced increased species. Light consistently allocation photosynthesis growth, pattern similar These results suggest nitrogen–photosynthesis relationship varies different levels species preferentially allocated non-photosynthetic processes, rather photosynthesis, as increased.

Язык: Английский

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Higher global gross primary productivity under future climate with more advanced representations of photosynthesis

Science Advances, Год журнала: 2023, Номер 9(46)

Опубликована: Ноя. 17, 2023

Gross primary productivity (GPP) is the key determinant of land carbon uptake, but its representation in terrestrial biosphere models (TBMs) does not reflect our latest physiological understanding. We implemented three empirically well supported often omitted mechanisms into TBM CABLE-POP: photosynthetic temperature acclimation, explicit mesophyll conductance, and optimization through redistribution leaf nitrogen. used RCP8.5 climate scenario to conduct factorial model simulations characterizing individual combined effects on projections GPP. Simulated global GPP increased more strongly (up 20% by 2070-2099) comprehensive representations photosynthesis compared lacking mechanisms. The experiments revealed non-additive interactions among as were stronger than sum effects. modeled responses are explained changes sensitivity CO2 caused added Our results suggest that current TBMs underestimate future conditions.

Язык: Английский

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Parallels between drought and flooding: An integrated framework for plant eco‐physiological responses to water stress

Plant-Environment Interactions, Год журнала: 2023, Номер 4(4), С. 175 - 187

Опубликована: Июнь 30, 2023

Drought and flooding occur at opposite ends of the soil moisture spectrum yet their resulting stress responses in plants share many similarities. limits root water uptake to which respond with stomatal closure reduced leaf gas exchange. Flooding metabolism due oxygen deficiency, also As drought can consecutively same system plant similar mechanisms, a single theoretical framework that integrates over continuum conditions from is attractive. Based on review recent literature, we integrated main eco-physiological mechanisms focus transport, dynamics, We used theory soil-plant-atmosphere modeling as "backbone" for our framework, subsequently incorporated interactions between processes regulate status, abscisic acid ethylene levels, acclimation strategies response drought, waterlogging, complete submergence. Our provides basis development mathematical models describe flooding.

Язык: Английский

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