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Plant function and evolutionary biology
RESEARCH ARTICLE

Photosynthetic light responses of apple (Malus domestica) leaves in relation to leaf temperature, CO2 and leaf nitrogen on trees grown in orchard conditions

Dennis H. Greer
+ Author Affiliations
- Author Affiliations

National Wine and Grape Industry Centre, School of Agricultural and Wine Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia. Email: dgreer@csu.edu.au

Functional Plant Biology 45(11) 1149-1161 https://doi.org/10.1071/FP18093
Submitted: 15 January 2018  Accepted: 4 June 2018   Published: 25 June 2018

Abstract

Apple trees growing in orchard conditions with two levels of soil nitrogen were used to determine photosynthetic light responses in relation to leaf temperature. In addition, leaves growing along the shoot were measured, and substrate supply for photosynthesis manipulated by altering CO2 concentrations. Results indicated highly significant interactions between leaf temperature, CO2 concentration, leaf position and nitrogen concentrations on attributes of the photosynthetic light responses. Elevated CO2 enhanced the effect of leaf temperature on the light saturated rate (Amax). There were significant effects of leaf position, and apparent photon yield (quantum efficiency) of photosynthesis, Amax and photosynthetic nitrogen use efficiency (ANUE) increased along the shoot, from leaves at the shoot base to those at apical positions; elevated CO2 enhanced these differences. A similar trend occurred with leaf nitrogen, accounting for increases in the photon yield, Amax and ANUE. It was concluded that apical leaves may have accumulated nitrogen which caused the high photosynthetic capacity and nitrogen use efficiency, as these leaves were possibly most exposed. Basal leaves, being possibly exposed to lower light intensities, had low nitrogen concentrations which accounted for their low photosynthetic light responses. This study does demonstrate that the shoot position of the apple leaves had marked effects on the photosynthetic light response and these were correlated with the leaf nitrogen content.

Additional keywords: apple, carbon dioxide, fruit sink, leaf nitrogen, modelling, photosynthesis.


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