| dc.contributor.advisor | Professor Dr. M. Afzal Hossain | |
| dc.contributor.author | Haque, Md. Maksud-UI | |
| dc.date.accessioned | 2022-04-21T08:48:52Z | |
| dc.date.available | 2022-04-21T08:48:52Z | |
| dc.date.issued | 2012-12 | |
| dc.identifier.uri | http://localhost:8080/xmlui/handle/123456789/422 | |
| dc.description | Rice is one of the three important cereals and it is produced annually at
worldwide levels of more than 600 million tons and will be more than 800
million tons as early as 2025 (Green et al., 2005). Ninety percent of the world’s
rice is produced and consumed in Asia, where irrigated and rainfed rice
ecosystems form the mainstay of food security in many countries (Wassmann ef
al., 2009). It is consumed by about 3 billion people and is the most common
staple food of a large number of people on earth; in fact, it feeds more people
than any other crop (Maclean et al., 2002). This important cereal crop accounts
about 50-80% of total calories obtained from cereals (Delseny et al., 2001) | en_US |
| dc.description.abstract | A study was conducted to screen out the low temperature tolerate boro rice
seedlings during the period of November, 2011 to January, 2012 for facing
upcoming rice production challenge in northwest Bangladesh. The experimental
period was characterized by prevailing low environmental temperature of below
15°C. Seven rice cultivars (V1: Poshu sail; V2: BRRI dhan28; V3: Jirashail; V4:
Nerica-4; V5: GSR-IRRI 1; V6: Purple rice; V7: BRRI dhan50/ Banglamoti)
both from local and HYV varieties were selected for the research. The amount
of proline, chlorophyll-a, chlorophyll-b, chlorophyll-a/b ratio, total carotenoid
and total chlorophyll content was markedly influenced by low temperature and
found to increase its content in rice seedling with exposure to low temperature.
The V6 (purple rice) rice cultivar synthesized the highest proline (1.06 mg g”)
followed by V4 (NERICA-4) which contained 0.87 mg g” proline. The highest
amount of chlorophyll-a (7.071 mg g”'), chlorophyll-b (3.335 mg g’') and total
chlorophyll (10.52 mg g”) was measured in V4 (NERICA-4). The V3 (Jirashail)
rice cultivar was found to synthesize highest amount of total carotenoid (1.247
mg g’). The highest chlorophyll-a/b ratio (2.887) was also observed in V3
(Jirashail). The highest leaf relative water content (94.42% at 32 DAS) was
found in V2 (BRRI dhan 28). The highest shoot length was measured in V1
(100.30 mm at 36 DAS) and the highest percent shoot dry weight was found in
V3 (31.01% at 12 DAS) followed by V4 (28.34% at 12 DAS). Again, the
highest percent root dry weight (72.96% at 12 DAS) was found in V3
(Jirashail). The highest amount of protein (13.99%) and starch (28.84%) content
was found in V4 (NERICA-4) at 36 DAS. The highest percent of seed
germination was also found in V4 (85%) at 10 DAG. In this study, the V4
(NERICA-4) and V3 (Jirashail) cultivars (among the HYV and local cultivars)
showed comparatively better potentiality to survive at low temperature (below
15°C) prevailing areas during boro season by synthesizing elevated amount of
proline. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR. | en_US |
| dc.subject | Cold stress and protein | en_US |
| dc.subject | MATERIALS AND METHODS | en_US |
| dc.subject | RESULTS AND DISCUSSION | en_US |
| dc.title | INVESTIGATION OF COLD SURVIVAL MECHANISM OF DIFFERENT RICE CULTIVARS AT SEEDLING STAGE BASED ON BIOCHEMICAL AND PHYSIOLOGICAL CHARACTERISTICS | en_US |
| dc.type | Thesis | en_US |
