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Publication Type J
Authors Chowrasia, S., J. Nishad, R. Pandey and T. K. Mondal
Title Oryza coarctata is a triploid plant with initial events of C4 photosynthesis evolution
Source Plant Science
Author Keywords Abiotic stress Adaptation Chromosomes Photosynthesis Triploid porteresia-coarctata c-4 photosynthesis sativa l. rice insights
Abstract Oryza coarctata is an obligate halophyte of wild species of rice which thrives well under high saline as well as submerged conditions. We report here for the first time that O. coarctata is triploid (2n = 3x = 36), though it was previously known as tetraploid (2n = 4x = 48). The chromosome number of O. coarctata was determined from mitotic plates of root tips and ploidy level was determined by flow cytometer, where it was found to be triploid (2n = 3x = 36). In addition, this species was found to possess several unique anatomical features in leaves such as presence of Kranz-anatomy, increased vein density and higher ratio of bundle sheath to mesophyll cell area as compared to rice variety (IR-29). Ultra-structure of leaf showed the presence of bundle sheath cells with significant number of chloroplasts and mitochondria which were arranged centrifugally. Chloroplasts lack grana in bundle sheath cell whereas, mesophyll cell contain well-developed grana. These anatomical and ultra structural characteristics indicate that this plant is in initial stage of evolving towards C4 photosynthesis due to high selection pressure which might help it to survive in wide range of ecological conditions i.e. from submerged saline to non-saline terrestrial condition.
Author Address [Chowrasia, Soni; Nishad, Jyoti; Mondal, Tapan Kumar] Indian Agr Res Inst, ICAR Natl Inst Plant Biotechnol, LBS Ctr, New Delhi 110012, India. [Pandey, Rakesh] ICAR Indian Agr Res Inst, Div Plant Physiol, New Delhi 110012, India. Mondal, TK (corresponding author), Indian Agr Res Inst, ICAR Natl Inst Plant Biotechnol, LBS Ctr, New Delhi 110012, India. mondaltk@yahoo.com
ISSN 0168-9452
ISBN 0168-9452
29-Character Source Abbreviation Plant Sci.
Publication Date Jul
Year Published 2021
Volume 308
Digital Object Identifier (DOI) 10.1016/j.plantsci.2021.110878
Unique Article Identifier WOS:000655696600003

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