tailieunhanh - Comparative studies of six populations of Isoetes panchganiensis from India

The present investigation does not show any variation in habitat (aquatic), rhizomorph (trilobed), velum (fenestra), and presence or absence of peripheral strands; however, there is a subtle variation in the length of plants, number of leaves, size of megasporangia, and size and ornamentation of the megaspores. | Research Article Turk J Bot 36 (2012) 667-676 © TÜBİTAK doi: Comparative studies of six populations of Isoetes panchganiensis from India Brij Bhan YADAV1,*, Sarvesh Kumar SINGH1, Manju SRIVASTAVA2, Gopal Krishan SRIVASTAVA1 1 Department of Botany, University of Allahabad, Allahabad, 211002 Uttar Pradesh - INDIA 2 Department of Botany, CMP Degree College, Allahabad, Uttar Pradesh - INDIA Received: ● Accepted: Abstract: Six populations of Isoetes panchganiensis ., & growing in different environmental conditions of the Western Ghats have been studied to determine the range of variation within the species. The present investigation does not show any variation in habitat (aquatic), rhizomorph (trilobed), velum (fenestra), and presence or absence of peripheral strands; however, there is a subtle variation in the length of plants, number of leaves, size of megasporangia, and size and ornamentation of the megaspores. The basic organisation of the megaspores of all the populations is almost same, but the finer details of the ornamentation of the megaspores exhibit subtle differences. They may be retate to reticulate. The muri may be complete or incomplete. Megaspores of the Kolahapur population are the largest in diameter, whereas the megaspores of the Khinger population are the smallest in diameter. Key words: Spore, environment, population, Western Ghats, India Introduction The Western Ghats is one of the hot spots of Indian biodiversity. It is the abode of a number of rare and precious species. The quillworts are an important component of the Western Ghats flora. They are widely distributed in Maharashtra and Karnataka states (Figure 1). Isoetes sahyadriensis Mahab. was the first species of the genus described by Mahabale (1938) from the Panchgani tableland of Maharashtra and the Sahyadri hills of Karnataka. Subsequently, Shende (1945) described the second species, Isoetes dixitei Shende, .