Contrasting biomass allocation responses across ontogeny and stress gradients reveal plant adaptations to drought and cold

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F21%3A43903045" target="_blank" >RIV/60076658:12310/21:43903045 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985939:_____/21:00543818

Výsledek na webu

<a href="https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2435.13687" target="_blank" >https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2435.13687</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/1365-2435.13687" target="_blank" >10.1111/1365-2435.13687</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Contrasting biomass allocation responses across ontogeny and stress gradients reveal plant adaptations to drought and cold

Popis výsledku v původním jazyce

How plants allocate their biomass to different organs is essential to understanding plant adaptations and distributions. Overall, biomass allocation may follow fixed rules across taxa. They are also likely to exhibit substantial departure from these rules during ontogeny and in response to particular limiting factors to optimize their growth and maximize their survival. However, how plants adjust their allocation priorities depending on size and age across stress gradients remain largely unknown in wild populations. We examined ontogenetic variation in biomass allocation in Himalayan forbPotentilla pamiricaacross its 5,250-5,900-m elevation range, between populations from dry steppe, wet alpine and cold subnival zone. We evaluated whether biomass allocation followed optimal partitioning or fixed allometric rules using organ mass in 1,019 individuals spanning 1-73 years. We found shifting biomass fractions with plant size and age, supporting the optimal partitioning theory. Young plants (&lt;10 years) allocated similar proportions of biomass to leaves, stems and roots, intermediate-aged plants (10-30 years) allocated more biomass to roots, while the oldest plants had 90% biomass in below-ground stems. Major developmental processes including secondary thickening, branching and flowering begin 10-15 years earlier under more thermally favourable steppe conditions. Young steppe plants are larger than alpine and subnival plants, but these differences disappear in plants aged similar to 30, and the oldest alpine and subnival plants are larger than steppe plants. Plant age exerted significant control over biomass allocation after controlling for plant size. While in steppe plants the preference for stem biomass allocation increases with both size and age, for large alpine and subnival plants the stem prioritization decreases with age in favour of root and leaf mass fractions. We interpret root and leaf prioritization in older plants as a way to reduce carbon imbalances and the risk of frost damage to secure long life. Our analyses rejected ontogenetically fixed allometry and instead found high variation in biomass allocation depending on age, size and environment, supporting optimal partitioning theory. The uneven allocation of resources to different structures and functions during ontogenesis reflects plant adaptations to different levels of low-temperature and water stress across species elevation range.

Název v anglickém jazyce

Contrasting biomass allocation responses across ontogeny and stress gradients reveal plant adaptations to drought and cold

Popis výsledku anglicky

How plants allocate their biomass to different organs is essential to understanding plant adaptations and distributions. Overall, biomass allocation may follow fixed rules across taxa. They are also likely to exhibit substantial departure from these rules during ontogeny and in response to particular limiting factors to optimize their growth and maximize their survival. However, how plants adjust their allocation priorities depending on size and age across stress gradients remain largely unknown in wild populations. We examined ontogenetic variation in biomass allocation in Himalayan forbPotentilla pamiricaacross its 5,250-5,900-m elevation range, between populations from dry steppe, wet alpine and cold subnival zone. We evaluated whether biomass allocation followed optimal partitioning or fixed allometric rules using organ mass in 1,019 individuals spanning 1-73 years. We found shifting biomass fractions with plant size and age, supporting the optimal partitioning theory. Young plants (&lt;10 years) allocated similar proportions of biomass to leaves, stems and roots, intermediate-aged plants (10-30 years) allocated more biomass to roots, while the oldest plants had 90% biomass in below-ground stems. Major developmental processes including secondary thickening, branching and flowering begin 10-15 years earlier under more thermally favourable steppe conditions. Young steppe plants are larger than alpine and subnival plants, but these differences disappear in plants aged similar to 30, and the oldest alpine and subnival plants are larger than steppe plants. Plant age exerted significant control over biomass allocation after controlling for plant size. While in steppe plants the preference for stem biomass allocation increases with both size and age, for large alpine and subnival plants the stem prioritization decreases with age in favour of root and leaf mass fractions. We interpret root and leaf prioritization in older plants as a way to reduce carbon imbalances and the risk of frost damage to secure long life. Our analyses rejected ontogenetically fixed allometry and instead found high variation in biomass allocation depending on age, size and environment, supporting optimal partitioning theory. The uneven allocation of resources to different structures and functions during ontogenesis reflects plant adaptations to different levels of low-temperature and water stress across species elevation range.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10618 - Ecology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Functional Ecology

ISSN

0269-8463

e-ISSN

—

Svazek periodika

35

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

32-42

Kód UT WoS článku

000576150000001

EID výsledku v databázi Scopus

2-s2.0-85092159358