| dc.contributor.advisor | Professor Dr. Bikash Chandra Sarker | |
| dc.contributor.author | NISU, ZANNATA UMA | |
| dc.date.accessioned | 2022-04-24T05:21:43Z | |
| dc.date.available | 2022-04-24T05:21:43Z | |
| dc.date.issued | 2017-06 | |
| dc.identifier.uri | http://localhost:8080/xmlui/handle/123456789/727 | |
| dc.description | Rice is the most important crops in Asian countries. Rice (Oryza sativa L.) being one of
the most cultivated cereals in all over the world (Golshani et al., 2010) and the demand
for rice will increase dramatically because of the steady increase in population (Liu et al.,
2012). Rice is the world most important food supplier cereal crop after wheat and maize
(Ray, 1985).Besides, based on the rice cultivation, Bangladesh is the 4th largest country
of the world (BBS 2016).Worldwide rice is cultivated in 150 million hectares, which is
more than 10% of the earth’s arable land. A total of 15.03 million hector of land are used
for rice cultivation in Bangladesh which produced 33.83 million tons of rice in the fiscal
year of 2012-13 (BBS 2012-13). At the current growth of population requirement of rice
increases dramatically and many nations are facing second-generation challenge of
producing more rice at less cost in a deteriorating environment. Thus, improved
technologies are required to achieve the goal of ensuring food security which is a
challenging task. Therefore, enhancing productivity of rice through novel genetic
approaches and exogenous plant growth regulators will be necessary.
Plant growth regulators play vital roles in coordination of many growth and behavioral
processes in rice, which regulates the amount, type and direction of plant growth
(Rajendra and Jones Jonathan, 2009; Anjum et al., 2011). Plant growth regulators play
important roles in plant growth and development, but little is known about roles of PGRs
in yield, grain. | en_US |
| dc.description.abstract | A field experiment was conducted to study the effect of gibberellic acid (GA3) on
morpho-physiological, yield and yield characters of three aromatic rice varieties cv.
Kataribhog, Chinigura, and Kalijira. Gibberellic acid (GA3) was applied @ 0, 25, 50 and
75 ppm at vegetative and pre-flowering stages. The growth parameters such as plant
height, leaf number, leaf length, leaf width, number of total tiller, number of effective
tiller and yield and yield attributes were studied along with biochemical parameters like
proline and chlorophyll pigments of flag leaves. The GA3 @ 50 ppm showed the better
stimulatory effect on growth parameters. Different levels of GA3 had also positive effect
on chlorophyll-a, chlorophyll-b and total chlorophyll contents of aromatic rice flag leaf.
The maximum amount of chlorophyll-a 22.8 mg g-1 was found in Chinigura using 50
ppm and the lowest amount of chlorophyll-a was 19.1 mg g-1 produced in Kalijira under
controlled condition followed by Kataribhog (19.2 mg g-1). The highest amount of total
chlorophyll content was observed (30.55 mg g-1) in Chinigura using 50 ppm treatments
while the lowest amount of total chlorophyll content (25.54 mg g-1) was observed in
Kalijira followed by Kataribhog (25.58 mg g-1) under controlled condition treatments.
Some yield contributing characters of aromatic rice such as grain number per panicle,
filled grain per panicle, and 1000-grain weights were significantly increased due to
application of different levels of GA3. Effective tiller, panicle length, total grain yield,
grain number per panicle, filled grain per panicle, thousand grain weights, and harvest
index were also influenced by the different levels of GA3. The maximum number of
effective tiller (15.00) was found in Chinigura rice variety at 50 ppm GA3.The highest
panicle length (26.50 cm) was recorded in Chinigura rice variety at 50 ppm GA3. The
highest grain number per panicle (170.78) was obtained in Chinigura rice variety at 50
ppm GA3.The maximum number of filled grain per panicle was recorded in Chinigura
rice variety (165.45) at 50 ppm followed by (162.00) also in chinigura at 75 ppm GA3.
The maximum thousand grain weights (12.69 g) were in Chinigura rice variety. The
highest grain yield (4.23 t ha-1) was in Chinigura rice variety at 50 ppm GA3. Spraying
50 ppm GA3 at vegetative and pre-flowering stages showed better yield potential in three
aromatic rice tested but the variety Chinigura performed the best among the three
aromatic rice varieties. Plant growth regulator promotes the growth and yield of aromatic
rice varieties which might be an alternative eco-friendly tool for rice production. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR. | en_US |
| dc.subject | CHLOROPHYLL | en_US |
| dc.subject | PLANT GROWTH | en_US |
| dc.title | INVESTIGATION OF CHLOROPHYLL CONTENT OF LEAVES, GROWTH AND YIELD OF THREE AROMATIC CULTIVARS UNDER PLANT GROWTH REGULATOR –GIBBERELLIC ACID | en_US |
| dc.type | Thesis | en_US |
