Needle permeability of Norway spruce (Picea abies (L.) Karst.) as influenced by magnesium nutrition

Citation
D. Bouya et al., Needle permeability of Norway spruce (Picea abies (L.) Karst.) as influenced by magnesium nutrition, BELG J BOT, 132(2), 1999, pp. 105-118
Citations number
32
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
BELGIAN JOURNAL OF BOTANY
ISSN journal
0778-4031 → ACNP
Volume
132
Issue
2
Year of publication
1999
Pages
105 - 118
Database
ISI
SICI code
0778-4031(1999)132:2<105:NPONS
Abstract
This paper tests the hypothesis that Mg-deficient spruce suffers higher lea ching loss rates of mineral elements due to increased cuticular permeabilit y. To that end, it compares healthy looking and Mg-deficient declining adul t spruce ill the Ardennes and young healthy and Mg-deficient spruce grown u nder controlled conditions. In the field, measured throughfall deposits and calculated needle excretion s were lower under healthy than under Mg-deficient declining spruce showing abnormal needle loss, eroded epicuticular wax structures of their needles and higher wettability. Laboratory experiments demonstrated that leaching and absorption intensitie s were higher for Mg-deficient needles than for healthy needles. These diff erences were adequately explained by a well structured epicuticular wax lay er of healthy needles and malformed wax agglomerates of Mg-deficient needle s. It was concluded that Mg-deficiency can explain high needle permeability as a result of malformed epicuticular wax structures. Enhanced throughfall and needle excretion of declining spruce in the field appeared to have at least partly the same origin.