Calcium-enhanced phosphorus toxicity in calcifuge and soil-indifferent Proteaceae along the Jurien Bay chronosequence

被引:37
作者
Hayes, Patrick E. [1 ,2 ,3 ]
Pereira, Caio Guilherme [1 ,2 ]
Clode, Peta L. [1 ,2 ]
Lambers, Hans [1 ]
机构
[1] Univ Western Australia, Sch Biol Sci, 35 Stirling Highway, Perth, WA 6009, Australia
[2] Univ Western Australia, Ctr Microscopy Characterisat & Anal, 35 Stirling Highway, Perth, WA 6009, Australia
[3] Japan Int Res Ctr Agr Sci, Crop Livestock & Environm Div, Tsukuba, Ibaraki 3058656, Japan
基金
澳大利亚研究理事会;
关键词
calcifuge; calcium; calcium-enhanced phosphorus toxicity; Jurien Bay chronosequence; phosphorus; phosphorus-enhanced zinc requirement; Proteaceae; zinc; SOUTH-WESTERN AUSTRALIA; CLUSTER ROOTS; CUT FLOWER; GROWTH; ZINC; PHOSPHATE; LEAVES; PLANTS; ACCUMULATION; PHYSIOLOGY;
D O I
10.1111/nph.15447
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Many Proteaceae are highly phosphorus (P)-sensitive and occur exclusively on old nutrient-impoverished acidic soils (calcifuge), whilst a few also occur on young calcareous soils (soil-indifferent) that are higher in available calcium (Ca) and P. Calcium increases the severity of P-toxicity symptoms, but its underlying mechanisms are unknown. We propose that Ca-enhanced P toxicity explains the calcifuge habit of most Proteaceae. Four calcifuge and four soil-indifferent Proteaceae from South-Western Australia were grown in hydroponics, at a range of P and Ca concentrations. Calcium increased the severity of P-toxicity symptoms in all species. Calcifuge Proteaceae were more sensitive to Ca-enhanced P toxicity than soil-indifferent ones. Calcifuges shared these traits: low leaf zinc concentration ([Zn]), low Zn allocation to leaves, low leaf [Zn]:[P], low root : shoot ratio, and high seed P content, compared with soil-indifferent species. This is the first demonstration of Ca-enhanced P toxicity across multiple species. Calcium-enhanced P toxicity provides an explanation for the calcifuge habit of most Proteaceae and is critical for the management of this iconic Australian family. This study represents a major advance towards an understanding of the physiological mechanisms of P toxicity and its role in the distribution of Proteaceae.
引用
收藏
页码:764 / 777
页数:14
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