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Plant function and evolutionary biology
RESEARCH ARTICLE

Diversity in structure and forms of carbon assimilation in photosynthetic organs in Cleome (Cleomaceae)

Elena V. Voznesenskaya A , Nuria K. Koteyeva A , Asaph Cousins B and Gerald E. Edwards B C
+ Author Affiliations
- Author Affiliations

A Laboratory of Anatomy and Morphology, Komarov Botanical Institute of the Russian Academy of Sciences, St Petersburg, Russia.

B School of Biological Sciences, Washington State University, Pullman, WA 99164-4236, USA.

C Corresponding author. Email: edwardsg@wsu.edu

Functional Plant Biology 45(10) 983-999 https://doi.org/10.1071/FP17323
Submitted: 17 November 2017  Accepted: 23 March 2018   Published: 26 April 2018

Abstract

Photosynthesis in different organs of Cleome was analysed in four species known to have differences in leaf photosynthesis: Cleome africana Botsch. (C3), Cleome paradoxa R.Br. (C3-C4 intermediate), Cleome angustifolia Forssk. and Cleome gynandra L. (C4). The chlorophyll content, carbon isotope composition, stomatal densities, anatomy, levels and compartmentation of some key photosynthetic enzymes, and the form and function of photosynthesis were determined in different organs of these species. In the three xerophytes, C. africana, C. paradoxa, and C. angustifolia, multiple organs contribute to photosynthesis (cotyledons, leaves, petioles, stems and pods) which is considered important for their survival under arid conditions. In C. africana, all photosynthetic organs have C3 photosynthesis. In C. paradoxa, cotyledons, leaves, stems and petioles have C3-C4 type features. In C. angustifolia, the pods have C3 photosynthesis, whereas all other organs have C4 photosynthesis with Kranz anatomy formed by a continuous, dual layer of chlorenchyma cells. In the subtropical C4 species C. gynandra, cotyledons, leaves, and pods develop C4 photosynthesis, with Kranz anatomy around individual veins; but not in stems and petioles which have limited function of photosynthesis. The diversity in forms and the capacity of photosynthesis in organs of these species to contribute to their carbon economy is discussed.

Additional keywords: chlorenchyma, chloroplast ultrastructure, Cleome, Cleomaceae, C3 plants, C4 plants, immunolocalisation, Kranz anatomy, petiole, stem and pod anatomy, photosynthetic enzymes.


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