COLD TOLERANT MECHANISM OF SOME SELECTED RICE SEEDLINGS AT LOW TEMPERATURE ENVIRONMENT
Date
2012-12
Authors
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Journal ISSN
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Publisher
HAJEE MOHAMMOD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR
Abstract
A field experiment was carried out to investigate the physio-morphological
characteristics of seedlings four rice cultivars for screening cold survival during
low temperature in Northwest of Bangladesh. The test rice cultivars were V1,
NERICA-10; V2, IR- 40 (GSR-IRRI- 40); V3, Lafaya and V4, Gochi, respectively.
The leaf proline, chlorophyll content, relative water content (RWC), protein,
starch, seedling shoot length, shoot weight and root length, root weight, total
biomass, and seed germination rate were investigated. The V1 (NERICA-10) and
V3 (Lafaya) seedling synthesized the higher leaf proline at low temperature than
those of other tested cultivars. The highest chlorophyll-a and -b was in V1
(NERICA-10). The V3 cultivar (Lafaya) had the highest percentage of relative
water content (92.93%). The V4 variety showed the highest content of protein
percentage (13.35%). The highest percent starch content was found in V3
(29.82%). The V3 plants had the highest shoot weight at all times of experiment in
2012 irrespective of fresh and dried condition. This study infers that V1 (NERICA10) and V3 (Lafaya) varieties showed the better survival potentiality during cold
temperature by over-synthesizing proline, chlorophyll and other physiomorphological parameters.
Description
Rice is one of the major food crops of the world. Worldwide rice is cultivated in
150 million hectares, which is more than 10% of the earth’s arable land. It is
also the staple food crops of nearly half of the total population of the world and
is the main source of calories of almost 40% of the world population. It is the
most important crop in Asia as a whole comprises to about 92% of the world
rice harvest (IRRI, 1995). Bangladesh is an agro-based country where
agriculture is the single largest sector and the mainstay of the country’s
economy. Bangladeshi agriculture is dominated by intensive rice cultivation.
Among the crops grown in Bangladesh rice covering an area of 11.06 million
hectares and producing 38.13 million tons of rice annually (FAO, 2002) and
about 76% of the total population live in rural areas are directly or indirectly
engaged in a wide range of agricultural activities (BBS, 2011).
Keywords
Proline, Protein content, Seed Germination