Characteristics of Oryza indandamanica Ellis, a newly discovered wild species
1988
Sharma, T.V.R.S. | Majunder, N.D. | Ram, T. | Mandal, A.B. (Central Agricultural Research Inst. for Andaman and Nicobar Islands, Port Blair (India))
A new wild species, Oryza indandamanica has been discovered in Rutland (11.50 degr N, 92.25 deg E), Andaman Islands, India. The perennial, herbaceous species was growing on a rocky slope over light loam soil, on a stream bank. Average annual rainfall is 3000 mm, spread unevenly over 8 months of the year. Temperature ranges from 27 to 32 deg C with 60-80% relative humidity. O. indandamanica averages 10 tillers/plant with shoot freshweight of 3.8 g and root fresh weight of 0.8 g. Basal internode diameter averages 1.2 cm. Leaf area per plant averages 0.24 square meter and leaves respond to moisture stress by rolling. Unbranched panicles bear an average of 8 awnless spikelets, which shed pollen having 4-5% sterility. The grains ate nonglutinous. This species is diploid with a chromosome number of 2n=24. To determine the characteristics, 10 plants were randomly selected from the original habitat. O. indandamanica is morphologically similar to Oryza meyeriana (Zoll and Mar.) Baill. var. meyeriana (Backer s.n.) and Oryza meyeriana var. granulata (Watt) Duistermaat with which this species should be compared.
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