Relating leaf photosynthetic rate to whole-plant growth: drought and shade effects on seedlings of four Quercus species

Functional Plant Biology : FPB
José Luis QueroLawren Sack

Abstract

Understanding the impacts of combined resource supplies on seedlings is critical to enable prediction of establishment growth, and forest dynamics. We investigated the effects of irradiance and water treatments on absolute growth, and relative growth rate (RGR) and its components, for seedlings of four Quercus species differing in leaf habit and with a wide variation in seed mass. Plants were grown for 6.5 months at three levels of irradiance (100, 27, and 3% daylight), and treated during the last 2.5 months with two watering treatments (frequent watering v. suspended watering). Both shade and drought reduced seedling growth rates, with a significant interaction: under full irradiance the drought treatment had a stronger impact on RGR and final biomass than under deep shade. For three species, seed mass was positively related to absolute growth, with stronger correlations at lower irradiance. The evergreen species grew faster than the deciduous species, though leaf habit accounted for a minor part of the interspecific variation in absolute growth. Seedling biomass was determined positively either by RGR or seed mass; RGR was positively linked with net assimilation rate (NAR) and leaf mass fraction (LMF), and seed mass was negat...Continue Reading

References

Sep 27, 2002·Annals of Botany·R HuntA P Askew
Apr 23, 2004·Nature·Ian J WrightRafael Villar
May 4, 2007·Nature·Bettina M J EngelbrechtStephen P Hubbell
Nov 1, 2007·American Journal of Botany·José Luis QueroLourens Poorter
Dec 1, 2004·Functional Plant Biology : FPB·Ülo NiinemetsWolfram Beyschlag
May 1, 2006·Functional Plant Biology : FPB·Eric L Kruger, John C Volin

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Citations

Dec 25, 2015·Nature·Sandra DíazLucas D Gorné
Apr 13, 2021·Ecology and Evolution·Catherine PreeceColin P Osborne
Jun 1, 2021·The Science of the Total Environment·Paula MadejónTeodoro Marañón

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