| dc.contributor.advisor | Md. Hasanuzzaman | |
| dc.contributor.author | ROY, MOHESWAR CHANDRA | |
| dc.date.accessioned | 2022-04-25T03:53:46Z | |
| dc.date.available | 2022-04-25T03:53:46Z | |
| dc.date.issued | 2009-06 | |
| dc.identifier.uri | http://localhost:8080/xmlui/handle/123456789/831 | |
| dc.description | Rice (Oryza sativa L.) is the staple food of more than half of the world’s
population. Most of the world’s rice is produced and consumed in Asia which
constitutes more than half of the global population (Chakravarthi and Naravaneni,
2006). It is considered to be a diploid species and has a somatic chromosome
number of 2n =24 with the genome of symbol AA. It belongs to the grass family
Gramineae, subfamily Bambusoidae of monocotyledons in the Angiospermae. In
the genus Oryza, 19 species were confirmed at the symposium on Rice Genetics
and Cytogenetics at the International Rice Research Institute (IRRI, 1964). But
Tateak (1963) proposed 22 species of Oryza. Recent taxonomic revisions have
reduced the number of species recognized in Oryza to 20 (Chang, 1970). Rice is
rich in carbohydrate and protein and is used mainly for human food consumed in
the form of whole grains. It provides more calories and protein than others cereals
(Norman and Kebe, 2006). World-wide rice provides 27% of dietary energy and
20% dietary protein (Kueneman, 2006). Rice occupies about 77% of total cropped
areas and it alone constitutes about 92% of the total food grains produced
annually in our country (Bhuiyan et al., 2002). It constitutes 95% of the cereals
consumed and supplies more than 80% of the calories and about 50% of the
protein in the diet of the general people of Bangladesh (Yusuf, 1997). Rice can be
grown in Bangladesh at any of the year on land above flood level. | en_US |
| dc.description.abstract | The field experiment was conducted at the experimental field of Genetics and Plant Breeding
department in Hajee Mohammad Danesh Science and Technology University, Dinajpur
during December, 2008 to May, 2009 to study floral biology, character association and
correlation provided by Basmati and Nepali fine rice. The results of the investigation revealed
that the highest mean difference (0.7) for pairs of tillers/fill at vegetative and (4.1) for pairs
of effective tillers/hill at maturity stage were observed at 2" 15 days interval of sowing. The
results of paired ‘t’ test indicated that tillers/hill at vegetative and effective tillers/fill at
maturity stage at 1* sowing period were highly significant and showed vast difference in
between the genotypes. Leaf angle under the flag leaf (0°) showed higher mean difference at
24 sowing 15 days later and paired ‘t’ test indicated, 2"4 sowing 15 days later pairs showed
highly significant difference among the three pairs. In case of leaves/tiller, paired ‘t’ test
indicated that appropriate time gave the maximum leaves for contributing photosynthesis.
Whereas paired ‘t’ test for panicle length (cm) and plant height (cm) showed highty significant
difference between Basmati and Nepali rice. Rachillae/panicle and fertile grains/panicle were
more yield increasing attributes at optimum period of sowing. Thousand grains/weight (g) and
yield /hill (g) in Nepali and Basmati showed the highest mean (23.087 (g) and 38.702(g)) at 1%
sowing followed by 2"4 15 days and 3 30 days interval of sowing. These indicated that 1%
sowing time gave more yield than other sowing period. The maximum pollen fertility (%) and
spikelet fertility (%) was observed in both varieties at 1% sowing period and the lowest at 3%
30 days interval of sowing. The range of maximum days required for flowers blooming and
commence anthesis after panicle emergence were 2-4 and 7-9 days respectively in both Nepali
and Basmati rice. The range of anthesis period was 7-10 a.m. in usual but the period of
opening of spikelets was (2 fr. 50 min.) in Nepali and (2hr. 45 min.) in Basmati rice.
Correlation coefficients of grain yield per hectare with fertile pollen, pollen fertility (%),
spikelet fertility (%) and period of opening of spikelets were positive and highly significant.
Whereas, correlation between grains yield per hectare with sterile pollen and period of
blooming flower were negative and significant. Selection based on fertile pollens, pollen
fertility (%), spikelet fertility (%) and period of opening spikelets would be effective for
increasing grains yield. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | HAJEE MOHAMMOD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR | en_US |
| dc.subject | BASMATI | en_US |
| dc.subject | NEPALI FINE RICE | en_US |
| dc.subject | Rachillae/Panicle | en_US |
| dc.title | LORAL BIOLOGY OF BASMATI AND NEPALI FINE RICE (Oryza sativa L.) | en_US |
| dc.type | Thesis | en_US |
