| dc.contributor.advisor | Professor Dr. Bikash Chandra Sarker | |
| dc.contributor.author | Aktar, Sumaiya | |
| dc.date.accessioned | 2022-04-22T05:44:59Z | |
| dc.date.available | 2022-04-22T05:44:59Z | |
| dc.date.issued | 2014-06 | |
| dc.identifier.uri | http://localhost:8080/xmlui/handle/123456789/505 | |
| dc.description | Plant growth and productivity is adversely affected by nature’s wrath in the
form of various abiotic and biotic stress factors. Plants are frequently exposed to
a plethora of stress conditions such as low temperature, salt, drought, flooding,
heat, oxidative stress and heavy metal toxicity. Various anthropogenic activities
have accentuated the existing stress factors. Heavy metals and salinity have
begun to accumulate in the soil and water tables and may soon reach toxic
levels. Plants also face challenges from pathogens including bacteria, fungi, and
viruses as well as from herbivores. All these stress factors are a menace for
plants and prevent them from reaching their full genetic potential and limit the
crop productivity worldwide. Abiotic stress in fact is the principle cause of crop
failure worldwide, dipping average yield for most major crops by more than
50% (Eshghi et al., 2010). Abiotic stresses cause losses worth hundreds of
million dollars each year due to reduction in crop productivity and crop failure.
In fact these stresses, threaten the sustainability of agricultural industry. World
population is increasing at an alarming rate and is expected to reach about six
billion by the end of the year 2050 (FAO, 2000). On the other hand, food
productivity is decreasing due to the effect of various abiotic stresses; therefore
minimizing these losses is a major area of concern for all nations to cope with
the increasing food requirements. Cold, salinity and drought are among the
abiotic stresses, which adversely affect plants growth and productivity; hence it
is important to develop stress tolerant crops. | en_US |
| dc.description.abstract | A field experiment was carried out to investigate the physio-morphological
characteristics of seedlings offive rice cultivars for screening cold survival
during low temperature in Northwest of Bangladesh. The test rice varieties were
BINA dhan-6, BRRI dhan26, BRRIdhan 28, BRRI dhan 29, BRRI dhan50. The
experiment was laid out in randomized complete block design (RCBD) with
three replications. 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. Results
indicate that rice varieties has significant effect on the parameters studied. BRRI
dhan 28 synthesized highest amount of proline (1.259 mg g''), chlorophyll-a
(2.630 mg g") , chlorophyll-b (0.847 mg g’'), relative water content (93.33 mg
g'), protine (14%), and starch (28.21%) content, seed germination (90.67%),
shoot (0.021) and root (0.025) dry weight. The performance of varieties at low
temperature was of the order of BRRI dhan28> BRRI dhan29> BRRI dhan26>
BINA dhan6> BRRI dhan50. The overall results of the study infers that BRRI
dhan28 showed the better survival potentiality during cold temperature by oversynthesizing proline, chlorophyll and other physio-morphological parameters. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR. | en_US |
| dc.subject | SEEDLING STAGE | en_US |
| dc.subject | RICE VARIETIESTO | en_US |
| dc.title | PHYSIOLOGICAL AND MORPHOLOGICAL RESPONSES OF FIVE RICE VARIETIES TO COLD STRESS AT SEEDLING STAGE | en_US |
| dc.type | Thesis | en_US |
