New nitrogen uptake strategy: specialized snow roots.

Abstract:

:The evolution of plants has yielded a wealth of adaptations for the acquisition of key mineral nutrients. These include the structure, physiology and positioning of root systems. We report the discovery of specialized snow roots as a plant strategy to cope with the very short season for nutrient uptake and growth in alpine snow-beds, i.e. patches in the landscape that remain snow-covered well into the summer. We provide anatomical, chemical and experimental (15)N isotope tracking evidence that the Caucasian snow-bed plant Corydalis conorhiza forms extensive networks of specialized above-ground roots, which grow against gravity to acquire nitrogen directly from within snow packs. Snow roots capture nitrogen that would otherwise partly run off down-slope over a frozen surface, thereby helping to nourish these alpine ecosystems. Climate warming is changing and will change mountain snow regimes, while large-scale anthropogenic N deposition has increased snow N contents. These global changes are likely to impact on the distribution, abundance and functional significance of snow roots.

journal_name

Ecol Lett

journal_title

Ecology letters

authors

Onipchenko VG,Makarov MI,van Logtestijn RS,Ivanov VB,Akhmetzhanova AA,Tekeev DK,Ermak AA,Salpagarova FS,Kozhevnikova AD,Cornelissen JH

doi

10.1111/j.1461-0248.2009.01331.x

subject

Has Abstract

pub_date

2009-08-01 00:00:00

pages

758-64

issue

8

eissn

1461-023X

issn

1461-0248

pii

ELE1331

journal_volume

12

pub_type

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