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Germination responses to current and future temperatures of four seeder shrubs across a latitudinal gradient in western Iberia.

Abstract：

PREMISE OF THE STUDY:Species differ in their temperature germination niche. Populations of a species may similarly differ across the distribution range of the species. Anticipating the impacts of climate variability and change requires understanding the differential sensitivity to germination temperature among and within species. Here we studied the germination responses of four hard-seeded Cistaceae seeders to a range of current and future temperatures. METHODS:Seeds were collected at sites across the Iberian Peninsula and exposed or not exposed to a heat shock to break dormancy, then set to germinate under four temperature regimes. Temperatures were varied daily and seasonally, simulating the temperature range across the gradient, plus an increased temperature simulating future climate. Time to germination onset and cumulative germination at the end of each season were analyzed for the effects of temperature treatments, seasons, and local climate (temperature of the germination period, Tgp) at each site. KEY RESULTS:Tgp was a significant covariate of germination in all species but Cistus populifolius. Temperature treatments significantly affected Cistus ladanifer, C. salviifolius, and Halimium ocymoides. Germination occurred in simulated autumn conditions, with little germination occurring at later seasons, except in unheated seeds of H. ocymoides. Exposure to a heat shock changed the sensitivity to temperature treatments and the relationships with Tgp. CONCLUSIONS:Germination responses to temperature differ not only among species but also within species across their latitudinal range. The responses were idiosyncratic and related to the local climate of the population. This germination variability complicates generalizing the impacts of climate variability and climate change.

journal_name

Am J Bot

journal_title

American journal of botany

authors

Chamorro D,Luna B,Moreno JM

doi

10.3732/ajb.1600278

subject

Has Abstract

pub_date

2017-01-01 00:00:00

pages

83-91

issue

eissn

0002-9122

issn

1537-2197

pii

ajb.1600278

journal_volume

104

pub_type

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Germination responses to current and future temperatures of four seeder shrubs across a latitudinal gradient in western Iberia.