Phosphorus recycling in photorespiration maintains high photosynthetic capacity in woody species

被引:90
作者
Ellsworth, David S. [1 ]
Crous, Kristine Y. [1 ]
Lambers, Hans [2 ]
Cooke, Julia [1 ,3 ]
机构
[1] Univ Western Sydney, Hawkesbury Inst Environm, Penrith, NSW 2751, Australia
[2] Univ Western Australia, Sch Plant Biol, Perth, WA 6009, Australia
[3] Macquarie Univ, Fac Sci, Dept Biol Sci, N Ryde, NSW 2109, Australia
基金
澳大利亚研究理事会;
关键词
low oxygen concentration; nitrogen; phosphorus; phosphate limitations; photosynthesis: carbon reactions; sclerophyll trees; LEAF NITROGEN; MESOPHYLL CONDUCTANCE; ISOTOPE DISCRIMINATION; BIOCHEMICAL-MODEL; CALCIUM-OXALATE; SOIL-PHOSPHORUS; CYCLE MODELS; ELEVATED CO2; RESPONSES; PLANTS;
D O I
10.1111/pce.12468
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Leaf photosynthetic CO2 responses can provide insight into how major nutrients, such as phosphorus (P), constrain leaf CO2 assimilation rates (A(net)). However, triose-phosphate limitations are rarely employed in the classic photosynthesis model and it is uncertain as to what extent these limitations occur in field situations. In contrast to predictions from biochemical theory of photosynthesis, we found consistent evidence in the field of lower A(net) in high [CO2] and low [O-2] than at ambient [O-2]. For 10 species of trees and shrubs across a range of soil P availability in Australia, none of them showed a positive response of A(net) at saturating [CO2] (i.e. A(max)) to 2kPa O-2. Three species showed >20% reductions in A(max) in low [O-2], a phenomenon potentially explained by orthophosphate (P-i) savings during photorespiration. These species, with largest photosynthetic capacity and P-i>2mmol Pm-2, rely the most on additional P-i made available from photorespiration rather than species growing in P-impoverished soils. The results suggest that rarely used adjustments to a biochemical photosynthesis model are useful for predicting A(max) and give insight into the biochemical limitations of photosynthesis rates at a range of leaf P concentrations. Phosphate limitations to photosynthetic capacity are likely more common in the field than previously considered.
引用
收藏
页码:1142 / 1156
页数:15
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