Abstract:
Blast is an important disease of wheat that significantly reduces the plant growth and
productivity. Proper management can ameliorate dysfunction in and improve the plant
growth and productivity. Therefore, the present study was conducted to explore the
protective role of the tebuconazole fungicide in helping wheat seedlings to tolerate
blast disease. Ten-day-old hydroponically grown seedlings were allowed to
inoculation of Magnaporthe oryzae triticum (MoT) spore suspension and with the
tebuconazole fungicides (0.3 g L
−1
) for the next six days. The inoculation of MoT
spore suspension deteriorated the growth of the wheat seedlings by increasing the
number of infected plant and leaf lesions. Among the varieties, lower blast symptom
was observed in BARI Gom 33 (V2P) compared to BARI Gom 26 (V1P). The
malondialdehyde (MDA) content increased by 102.80 and 163.96% in BARI Gom 26
and BARI Gom 33, respectively compared to control. Shoot and root electrolyte
leakage also increased by MoT inoculation. Therefore, the level of H
also
increased that observed in histochemical detection. The infection of blast disease,
relative water content decreased by 50.18 and 51.26% in BARI Gom 26 and BARI
Gom 33, respectively compared to control plant. Photosynthetic pigment such as Chl
a, Chl b, Chl (a+b), and carotenoid contents also reduced by blast infection. Thus the
growth and biomass of wheat seedlings were decreased. However, tebuconazole
fungicide reduced the oxidative damage by reducing MDA, electrolyte leakage,
H
2
O
2
and O
2
•−
production. Therefore, improved relative water content and
photosynthetic pigments as well as improved the growth and biomass of wheat
seedlings. These results indicate the exogenous application of tebuconazole fungicide
is a promising approach to improve blast tolerance in wheat plants. Further
investigation is needed under field conditions to determine the blast-tolerance induced
by tebuconazole fungicide application
Description:
A Thesis
Submitted to the Department of Plant Pathology,
Sher-e-Bangla Agricultural University, Dhaka
in partial fulfillment of the requirements
or the degree of
CAUSED BY Alternaria spp.
MASTER OF SCIENCE (MS)
IN
PLANT PATHOLOGY
