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. 2021 Nov 22;254(6):125.
doi: 10.1007/s00425-021-03781-3.

Structural analysis of extrafloral nectaries of Senna occidentalis L.: insights on diversity and evolution

Shadma Afzal  1 , Nand K Singh  2 , Nivedita Singh  3 , Nidhi Chaudhary  1
Affiliations

Structural analysis of extrafloral nectaries of Senna occidentalis L.: insights on diversity and evolution

Shadma Afzal et al. Planta. .

Abstract

The extrafloral nectaries of S. occidentalis were studied structurally and anatomically (at secretory and post-secretory developmental stages). Role of extrafloral nectaries as a common plant-adoptive characteristic in context to diversity and phylogenetic pattern was also speculated while exploring other collaborative evolutionary implications of this plant. Extrafloral nectaries (EFNs) are widespread and evolutionarily labile traits that have repeatedly and remarkably evolved in vascular plants. Morphological descriptions of the EFNs of certain plant species are common in the literature, but they rarely relate morphology with histology, gland distribution and secretory characteristics. Studies relating EFNs features, i.e., morphology and distribution with their differential visitation by insects, viz. ants and the cost of maintenance to the plants are important to understand the evolution of these glands. Therefore, in this study a morphological, anatomical (structure and ultrastructure) and secretory characterization of EFNs occurring on Senna occidentalis L. is made with the implications of gland attributes discussed from a functional perspective. S. occidentalis L. (Caesalpiniaceae) is an economically important species from industrial, medicinal and agricultural perspective. Observations from the result showed that shape of the EFNs (size 1-2 mm) ranged to globular, ovoid-conical, dome-shaped, fusiform or cylindrical with conical tip. The EFNs were sessile, positioned interpetiolar or seated at the base of petiole. Light and transmission electron microscopic studies showed the specific internal structures of the extrafloral nectary. Two developmental stages of the EFNs (secretory and post-secretory) were recognized. Our current understanding of the phylogenetic patterns of EFNs makes them powerful candidates for future work exploring the drivers of their evolutionary origins, shifts, and losses.

Keywords: Evolution; Extrafloral nectaries; Gland; Secondary metabolites; Senna occidentalis.

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References

    1. Afzal S, Sharma D, Singh NK (2021) Eco-friendly synthesis of phytochemical-capped iron oxide nanoparticles as nano-priming agent for boosting seed germination in rice (Oryza sativa L.). Environ Sci Pollut Res. https://doi.org/10.1007/s11356-020-12056-5 - DOI
    1. Anjos DV, Caserio B, Rezende FT, Ribeiro SP, Del-Claro K, Fagundes R (2017) Extrafloral-nectaries and interspecific aggressiveness regulate day/night turnover of ant species foraging for nectar on Bionia coriacea. Austral Ecol 42(3):317–328. https://doi.org/10.1111/aec.12446 - DOI
    1. Barbosa-Ferreira M, Dagli MLZ, Maiorka PC, Górniak SL (2005) Sub-acute intoxication by Senna occidentalis seeds in rats. Food Chem Toxicol 43(4):497–503. https://doi.org/10.1016/j.fct.2004.11.017 - DOI - PubMed
    1. Bentley BL (1977) Extrafloral nectaries and protection by pugnacious bodyguards. Ann Rev Ecol Syst 8(1):407–428. https://doi.org/10.1146/annurev.es.08.110177.002203 - DOI
    1. Bernardello G (2007) A systematic survey of floral nectaries. Nectaries and nectar. Springer, Dordrecht, pp 19–128. https://doi.org/10.1007/978-1-4020-5937-7_2 - DOI

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