| dc.contributor.advisor | Professor Dr. Bikash Chandra Sarker | |
| dc.contributor.author | Kulchhum , Mst. Umme | |
| dc.date.accessioned | 2022-04-22T04:19:21Z | |
| dc.date.available | 2022-04-22T04:19:21Z | |
| dc.date.issued | 2011 | |
| dc.identifier.uri | http://localhost:8080/xmlui/handle/123456789/457 | |
| dc.description | Rice (Oryza sativa L.) is the staple food for more than half of the world
population. The global rice production is 550 million tons and 2.15 million
tons is in Asia (Rao et al., 2007). It is one of the most important cereal
crops, the basic food of more than 3 billion people and it accounts for 50-
80% of their daily calories intake. Besides its immense economical
importance, rice has become a model system for genomics because of its
relatively small genome size of 440 mega base pairs in the graminaceous
family, and because of its closeness to other major cereal crops (Gale and
Devos, 1998).
World population is increasing at an alarming rate and is expected to reach
about six billion by the end of 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 filed experiment was carried out to investigate the physio-morphological
characteristics of nine rice seedlings for screening cold survival during low
temperature in Northwest of Bangladesh. The test rice varieties were V1, Bashful;
V2, Poshurshail; V3, Gochi; V4, Taipee; V5, Bogra; V6, Lafaya; V7, Banglamoti
(BRRIdhan-50); V8, Jotapari and V9, BRRIdhan-28, respectively. The leaf proline
synthesis, chlorophyll content, relative water content (RWC), seedling shoot and
root length, total biomass, seed germination and mortality rate were investigated.
The V2 (Poshurshail) and V9 (BRRIdhan-28) seedling synthesized the highest
proline at low temperature. The highest chlorophyll ‘a’ content was obtained in V1
(Bashful) local cultivar (1.75 mg g’') and statiscally similar to V2 (Poshurshail).
The highest percentage of RWC in rice leaf (95%) was found in V5 cultivar. The
highest shoot length (11.8 at 35 DAG) was found in V5 and the lowest shoot
length was found in V8 cultivar. The V8 plant showed significantly greater root
dry weight and root length while the lowest was in V6 plant for both cases. Root
weight, length as well as root volume markedly decreased during cold stressed
condition. The number of root number plant’ was found statistically significant
among the varieties. The V2 and V9 cultivars produced higher root and shoot
weight, higher germination percentage and lower mortality rate. This study reveals
that V2 (Poshurshail) and V9 (BRRIdhan-28) varieties showed the better survival
potentiality during cold temperature by over-synthesizing 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 | PHYSIO-MORPHOLOGICAL CHARACTERISTICS | en_US |
| dc.title | COLD TOLERANT MECHANISM OF RICE CULTIVARS BASED ON PHYSIO-MORPHOLOGICAL CHARACTERISTICS | en_US |
| dc.type | Thesis | en_US |
