Characterization of the effect of a QTL for drought resistance in rice, qtl12.1, over a range of environments in the Philippines and eastern India     

Jérôme Bernier  Arvind Kumar  Ramaiah Venuprasad  Dean Spaner  Satish Verulkar  Nimai P. Mandal  Pramod K. Sinha  Puvvada Peeraju  Praba R. Dongre  R. N. Mahto  Gary Atlin 《Euphytica》2009,166(2):207-217

A large-effect QTL for grain yield under drought conditions (qtl12.1) was reported in a rice mapping population derived from Vandana and Way Rarem. Here, we measured the effect of qtl12.1 on grain yield and associated traits in 21 field trials: ten at IRRI in the Philippines and 11 in the target environment of eastern India. The relative effect of the QTL on grain yield increased with increasing intensity of drought stress, from having no effect under well-watered conditions to having an additive effect of more than 40% of the trial mean in the most severe stress treatments. The QTL improved grain yield in nine out of ten direct-seeded upland trials where drought stress was severe or moderate, but no effect was measured under well-watered aerobic conditions or under transplanted lowland conditions. These trials confirm that qtl12.1 has a large and consistent effect on grain yield under upland drought stress conditions, in a wide range of environments.  相似文献   

Swietenine: A potential oral hypoglycemic from Swietenia macrophylla seed     

Saikat Dewanjee  Anup Maiti  Anup K. Das  Subhash C. Mandal  Sankar P. Dey 《Fitoterapia》2009

Swietenine, a tetranortriterpenoid, was isolated from the Swietenia macrophylla seeds. The in vivo hypoglycemic activity was evaluated against neonatal-streptozotocin induced type 2 diabetic rats. Oral administration of swietenine at 25 and 50 mg/kg body weight per day to diabetic rats was found to possess significant dose dependant hypoglycemic and hypolipidemic activity in type 2 diabetic rats.  相似文献   

Influence of fly ash mixtures on early tree growth and physicochemical properties of soil in semi-arid tropical Alfisols     

V. Ramesh  G. R. Korwar  Uttam Kumar Mandal  Jasti V. N. S. Prasad  Kishori Lal Sharma  Yezzu S. Ramakrishna  Kandula Venkanna 《Agroforestry Systems》2008,73(3):245-245

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An unusual mortality event in Johnstone River snapping turtles Elseya irwini (Johnstone) in Far North Queensland,Australia          下载免费PDF全文

E Ariel  AB Freeman  E Elliott  W Wirth  N Mashkour  J Scott 《Australian veterinary journal》2017,95(10):355-361

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Genetics of resistance in <Emphasis Type="Italic">Luffa cylindrica</Emphasis> Roem. against <Emphasis Type="Italic">Tomato leaf curl New Delhi virus</Emphasis>     

Sabina Islam  A. D. Munshi  Bikash Mandal  Ravinder Kumar  T. K. Behera 《Euphytica》2010,174(1):83-89

Sponge gourd is a popular vegetable grown throughout India. Tomato leaf curl New Delhi virus, the causal virus of tomato leaf curl disease, has recently been reported to be associated with sponge gourd, causing up to 100% crop loss under epidemic conditions. We have collected 30 genotypically diverse genotypes of sponge gourd from different parts of India, screened these for resistance under natural epiphytotic conditions, and then confirmed the results through challenge inoculation with a purified strain of the virus under insect-proof greenhouse conditions. The minimum vulnerability index was recorded in genotype DSG-6 (3.33), followed by DSG 7 (6.0) under the challenge (whitefly-populated) inoculation conditions. Two susceptible genotypes (‘Pusa Sneha’ and NSG-1-11), both possessing desirable fruit characters, were crossed with the two most promising resistant lines (DSG-6 and DSG-7) and the disease reaction of segregating and backcross generations studied through challenge inoculation with a purified strain of virus under insect-proof greenhouse conditions. A chi-square (χ²) test of frequency distribution based on the vulnerability index of the F₂ progenies of the two resistant × susceptible crosses revealed monogenic dominant Mendelian ratio 3(R):1(S) to be the best fit in all crosses. This monogenic dominant model was further confirmed by the 1(R):1(S) ratio found to be best fit for the test cross with the susceptible parent. These results reveal that resistance to Tomato leaf curl New Delhi virus associated with yellow mosaic disease of sponge gourd is controlled by a single dominant gene in the genetic background of the resistant parents (DSG-6 and DSG-7) and that these two lines can be effectively utilized for the development of high-yielding and yellow mosaic disease-resistant varieties/hybrids of sponge gourd. This is the first conclusive identification of a resistant source and the inheritance of resistance against Tomato leaf curl New Delhi virus in sponge gourd.  相似文献   

Chemical fractions and response of cauliflower (Brassica oleracea var. botrytis) to soil applied boron     

Rajeev Padbhushan  Jajati Mandal  Sunil Kumar  Amarjeet Kumar 《Journal of plant nutrition》2019,42(5):491-500

The present study was conducted with an objective to estimate the distribution of boron (B) application in various soil fractions and their plant response for assessing the availability in the soil. Two soils (alluvial and red soil) and five levels of B (0, 0.5, 1, 2 and 3?mg B kg^?1 soil) were applied in the pot experiment, and pots were sown with cauliflower (Sabour Agrim) arranged in a completely randomized block design (CRD) with three replications. Result showed that the curd yield of cauliflower increased significantly upto 2?mg B kg^?1 soil irrespective of soils. The percent yield increase was 14.78 and 15.01 in alluvial and red soil over the control, respectively. The initial total B content was 35.88 (alluvial soil) and 15.51 (red soil) mg·kg^?1. The mean content of Fraction I, II, III, IV and V in alluvial soil was 1.11, 1.54, 0.65, 1.49, and 95.18% and in red soil was 2.68, 4.47, 6.62, 2.50, and 83.59% of the total soil B, respectively. For changes in amount of B fractions due to B applications there was significant effect on all the fractions except Fraction II. The increase in apparent B uptake was 0.43?mg B kg^?1 in alluvial soil and 0.25?mg B kg^?1 in red soil over the control (0?mg B kg^?1 soil). Regression equation of yield and B fractions showed the relationship between first four fractions to the yield. Residual fraction was found to be collinear during calculation. Overall the study predicted the bioavailability and dynamics of B in the two distinct soils.  相似文献   

Evaluation of zincated nanoclay polymer composite in releasing Zn and P and effect on soil enzyme activities in a wheat rhizosphere     

Nintu Mandal  Samar C. Datta  Kanchikeri M. Manjaiah  Brahma S. Dwivedi  Rajesh Kumar  Pramila Aggarwal 《European Journal of Soil Science》2019,70(6):1164-1182

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Accumulation of tannin in different tissues of Indian major carps and exotic carps     

Sudipta Mandal  Koushik Ghosh 《Aquaculture Research》2010,41(6):945-948

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Replacement of live feed by formulated feed: effect on the growth and spawning performance of Siamese fighting fish (Betta splendens,Regan, 1910)     

Sagar C Mandal  Narottam P Sahu  Mahinder P Singh Kohli  Pronob Das  Sanjay K Gupta  Sukham Munilkumar 《Aquaculture Research》2010,41(11):1707-1716

Partial replacement of live feed (LF) with formulated feed (FF) was performed in Betta splendens to evaluate their growth, survival and reproductive performance. Three hundred B. splendens fry of uniform size (mean weight 0.19 g±0.01) were equally distributed in five treatment groups with each of three replicates in glass aquaria of 35 L capacity. Fish were offered diets of different ratio of LF and FF like T1 (control) – 100% LF; T2 – 75% LF, 25% FF; T3 – 50% LF, 50% FF; T4 – 25% LF, 75% FF and T5 – 100% FF. Highest (P<0.05) body weight gain (% BWG) (67.1±1.03) and specific growth rate (2.34±0.02) were observed in the T2 group. Best feed conversion ratio was also found in T2 (2.40±0.11), which was similar to T1 and T3. The highest survival rate (%) was recorded in T1, T2 and T3 groups (97±1.7), which was similar to T4 and the lowest in T5 (49±2.0). The highest gonadal weight (0.12 g±0.01) and gonadosomatic index (15.17±0.50) was observed in the T3 group during the first sampling after 63 days. No significant changes in spawning performance were observed in the second sampling after 21 days after first sampling. However, T4 group registered the highest fecundity and fertilized eggs at the end of 105 days of experiment. From the present study, it concludes that LF can be successfully replaced to the extent of 25% by FF without any detrimental effect on the growth, survival and spawning performance of B. splendens.  相似文献   

Effects of contrasting biochars on the leaching of inorganic nitrogen from soil     

Feng  Ying  Yang  Xing  Singh  Bhupinder Pal  Mandal  Sanchita  Guo  Jia  Che  Lei  Wang  Hailong 《Journal of Soils and Sediments》2020,20(8):3017-3026

Journal of Soils and Sediments - The use of excessive nitrogen (N) fertilizers usually causes soil N leaching, eutrophication, and water pollution. Nevertheless, biochars may play an important role...  相似文献