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mulberry under waterlogging condition. Bang. J. of Chemistry, Rajshahi University, Rajshahi).
Life Sci,, 2008, 20 (1), 117-121. In vitro fungicidal activities of two flavonoid
Effect of waterlogging on top dry weight, leaf compounds isolated from Cassia alata L. Bang.
area, growth parameters and leaf yield of five J. Life Sci., 2008, 20 (2), 59-64.
mulberry varieties was studied in field
condition. Both top dry weight and leaf area In vitro fungicidal screening of two pure
were highest in the normal watering treatment compounds 6,8,4'- trihydroxy isoflavone and
compared to the waterlogging 5,7,4'- trihydroxy flavanone isolated from
treatments.Specific leaf area (SLA) and leaf Cassia alata leaves, was done against 6 human
weight ratio (LWR) were highest in the pathogens, 3 animal pathogens and 4 plant
waterlogging treatments. Leaf yield and yield pathogens.The compounds 6,8,4'- trihydroxy
components were higher in the normal watering isoflavone was found to be active against
treatment than the waterlogging treatments. Trichophyton longifurus (human
Among the waterlogging treatments, later stage Pseudallescherea boydii (human), Microsporum
(60 days after planting (DAP)) with shorter canis (animal) and moderately active against
duration (10 days) plants had higher and early Trichophyton mentagrophytes (animal) und
stage (30 DAP) with longer duration (30 days) Fusarium solani var. lycopersici (plant).
plants were severely affected. The variety BM- Whereas, the compound 5,7,4'- trihydroxy
3 could be recommended for selecting as flavunone was found to be moderately active
tolerant against waterlogging. against the above pathogens. MIC value of the
compound 6,8,4'- trihydroxy isoflavone was
139 RAHMAN, G.M.S.(Faculty of Life determined against T. longifurus (human), P.
and Earth Science, National University, boydii (human) and M. canis (animal).
Gazipur); HOSSAIN, M.I. UL-AMIN, M.
(Dept. of Zoology, Dhaka University, Dhaka). 141 SHANTA, N.A.; MUBASSARA, S.
THE EFFECT OF AQUATIC PLANTS ON & KHAN, Z.U.M. (Dept. of Botany,
THE OVIPOSITION AND IMMATURE Jahangirnagar University, Savar,
STAGES OF CULEX QUINQUEFASCIATUS Dhaka).Occurrence and distribution of
SAY (DIPTERA : CULICIDAE). Bang. J. Zool, heterotrophic bacteria and Azospirillum in
2008, 36 (1), 19-26. hydrophytes. Bang. J. Life Sci., 2006, 18 (1),
59-62.
Experiments were performed to evaluate the
utility of aquatic plants Lemna perpusila, The occurrence of heterotrophic bacteria and
Spirodela polyrhiza,. Azolla pinnata,. Chara nitrogen-fixing bacterium Azospirillum in root
fragilis and Utricularia minor for the control of and stem samples of some selected hydrophytes
mosquito breeding. In the tests complete was studied. Roots and stems of five
coverage of the water surface with the test plant hydrophytes Enhydra fluctuans Lour.,
drastically reduced oviposition and larval Colocasia esculenta (L), Ipomoea aquatica
survival except for Azolla pinnata; two-thirds Forsk., Nymphaea nouchali Burm F.and
and half coverage by the test plants also Jussiaea repens L. were found to harbor
significantly reduced the oviposition rate and heterotrophic bacteria and Azospirillum. The
affected the survival of the immature stages of population of Heterotrophic bacteria and
st
Culex quinquefasciatus except for the 1 instar Azospirillum in different root and stem samples
st
larvae in two thirds water surface covered: 1 , varied significantly. Heterotrophic bacterial
rd
nd
7
th
2 , 3 and 4 instars in half surface covered population ranged from 2.25 x 10 to 26.25 x
7
with A. pinnata. 10 cfu/g sample and Azospirillum populalion
6
6
varied from 0.25 x 10 to 16 x 10 MPN/g
140 RAHMAN, M.S.; YEASMIN, S.; sample.
KHANAM, L.A.M. (BCSIR Laboratories,
Rajshahi); ALI, M.Y. & ALI, M.U. (Dept.
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