Stomatal variations in Solanum species

Photo credit: IJABPT

 

 

Taxonomic implications with special reference to stomatal variations in Solanum species using light and scanning electron microscope

by Kumar V. S. A., Murugan K. (2015)

in Int. Journ. Appl. Biol. Pharmac. Technol.

http://www.ijabpt.org/applied-biology/taxonomic-implications-with-special-reference-to-stomatal-variations-in-solanum-species-using-light-and-scanning-electron-microscope.php?aid=6563

Present investigation reveals the presence of anisocytic and anisotricytic stomata in S. macrocarpon (Fig. 2 A & B). Similarly, the stomata of S. trilobatum are reported as anamocytic type (Santhan, 2014). However, in the present analysis, it is observed as tetracytic (Fig.3). In addition to the anamocytic nature of stoma in S. erianthum, brachyparacytic stomata are also observed (Maiti et. al., 2002) (Fig.4 A & B). The controversy in the stomatal nature of Solanum species already exists in the literature. For example, in S. granulosoleprosum, Picoli et. al., (2013) reported paracytic type which was earlier reported as anisocytic by Petenetti et. al., (1998). Existence of different types of stomata in the same taxa was also described (Hameed and Hussain, 2011; Essiett and Okono, 2014). Nurit silva et.al., (2011) described anomocytic and anisocytic stomatal types in S. torvum. Similarly, Ferreira et. al., (2013) observed anomocytic and anisocytic stomata in S. capsicoides. Current observations revealed that the two accessions of S. capsicoides (spiny and lax spiny accessions) are having only anisocytic stomata (Fig.5 and Fig.6) while, S. torvum showed two types such as anisocytic and tetracytic (Fig. 7 A& B). – http://www.rroij.com/articles-images/IJABPT-15-08-067-g032.gif

 

Abstract

 

The systematic analysis between 15 different species and one species with two accessions in Solanum has been carried out and need all over revisions and investigations.

In continuation to our previous morphometric analysis, currently stomatal variation is analyzed using light microscopy and scanning electron microscopy.

In addition to classical anomocytic and anisocytic stomatal types, new types of stomata (anisotricytic, paratetracytic, diacytic and paracytic) are noticed for the first time in the genus Solanum .

The scanning electron microscopic study reveals the nature of stomatal pore, nature of peristomatal rims as well as the presence of epicuticular wax deposits and wax flakes which are of taxonomic significance.

This study also indicates that foliar stomatal characteristics are valuable taxonomic traits, which can be utilized to address the taxonomic issues within the genus.