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Plant function and evolutionary biology
RESEARCH ARTICLE

Delayed greening in phosphorus-efficient Hakea prostrata (Proteaceae) is a photoprotective and nutrient-saving strategy

Thirumurugen Kuppusamy https://orcid.org/0000-0002-3864-2477 A C , Dorothee Hahne https://orcid.org/0000-0002-6883-1949 B , Kosala Ranathunge https://orcid.org/0000-0003-2826-9936 A , Hans Lambers https://orcid.org/0000-0002-4118-2272 A and Patrick M. Finnegan https://orcid.org/0000-0001-5021-1138 A
+ Author Affiliations
- Author Affiliations

A School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia.

B Metabolomics Australia, Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia.

C Corresponding author. Email: skthikuppusamy@gmail.com

Functional Plant Biology 48(2) 218-230 https://doi.org/10.1071/FP19285
Submitted: 5 October 2019  Accepted: 18 September 2020   Published: 26 October 2020

Abstract

Hakea prostrata R.Br. (Proteaceae) shows a ‘delayed greening’ strategy of leaf development characterised by reddish young leaves that become green as they mature. This trait may contribute to efficient use of phosphorus (P) during leaf development by first investing P in the development of leaf structure followed by maturation of the photosynthetic machinery. In this study, we investigated the properties of delayed greening in a highly P-efficient species to enhance our understanding of the ecological significance of this trait as a nutrient-saving and photoprotective strategy. In glasshouse-grown plants, we assessed foliar pigments, fatty acids and nutrient composition across five leaf developmental stages. Young leaves had higher concentrations of anthocyanin, P, nitrogen (N), copper (Cu), xanthophyll-cycle pigments and saturated fatty acids than mature leaves. As leaves developed, the concentration of anthocyanins decreased, whereas that of chlorophyll and the double bond index of fatty acids increased. In mature leaves, ~60% of the fatty acids was α-linolenic acid (C18:3 n-3). Mature leaves also had higher concentrations of aluminium (Al), calcium (Ca) and manganese (Mn) than young leaves. We conclude that delayed greening in H. prostrata is a strategy that saves P as well as N and Cu through sequential allocation of these resources, first to cell production and structural development, and then to supplement chloroplast development. This strategy also protects young leaves against photodamage and oxidative stress during leaf expansion under high-light conditions.

Keywords: anthocyanin, chlorophyll, delayed greening, fatty acids, Hakea prostrata, nitrogen, phosphorus, photodamage, violaxanthin cycle pigments.


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