Abstract:
The experiment was conducted in the net house of the Department of Agricultural
Botany, Sher-e-Bangla Agricultural University, Dhaka-1207, during the period of
November, 2018-March, 2019 to find out the effect of mannitol on morphophysiology
and yield of wheat plant under salinity. BARI Gom-25 was used as a plant material.
The experiment consists of nine treatments viz. T
1
= Control, T
2
= Mannitol 15 mM
(M
1
), T
3
= Mannitol 30 mM (M
2
), T
4
= 4 dS m
-1
NaCl (S
1
), T
5
= 4 dS m
NaCl +
Mannitol 15 mM (S
1
+M
1
), T
6
= 4 dS m
-1
NaCl + Mannitol 30 mM (S
1
= 8
dS m
-1
NaCl (S
2
), T
8
= 8 dS m
NaCl + Mannitol 30 mM (S
2
-1
NaCl + Mannitol 15 mM (S
2
+M
2
+M
1
+M
2
) and T
9
). The experiment was laid out in a randomized
complete block design (RCBD) with three replications. Data on different growth,
physiological and yield contributing parameters of BARI Gom-25 were recorded.
Wheat plants exposed to maximum levels of salinity (8 dS m
-1
NaCl) resulted in the
lowest value of the studied parameters such as plant height (cm), tillers number plant
1
1
, leaf chlorophyll content (SPAD reading), filled grains spike
-1
-1
), T
7
= 8 dS m
, unfilled grains spike
, 1000-seed weight (g), dry weight of plant at harvest (g) and grain yield plant
(g).
Plants in non-saline and control treatments showed the highest value of the studied
parameters. Mannitol was applied in both saline and non-saline treated plants.
Application of mannitol to salinized wheat plants resulted in the significant
improvement of the studied parameters. But the effect of mannitol to non-salinized
wheat plants was similar to the effect of control plants. Mannitol application @
30mM (M
2
) performed best over 15mM (M
1
) for mitigating the damaging effect of
salinity on different growth, physiological, yield contributing and yield parameters of
wheat.
-1
-1
-
-
Description:
A Thesis
Submitted to the Department of Agricultural botany,
Sher-e-Bangla Agricultural University, Dhaka,
In partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE (MS)
IN
AGRICULTURAL BOTANY
SEMESTER: JANUARY- JUNE, 2020
