Infection process of Phoma koolunga on stem and leaf tissue of resistant and susceptible field pea (Pisum sativum)          下载免费PDF全文

H. S. Tran  M. P. You  T. N. Khan  M. J. Barbetti 《Plant pathology》2017,66(2):212-222

This study investigates the infection process of Phoma koolunga on field pea (Pisum sativum) stems and leaves using different susceptible and resistant pea genotypes for each tissue, viz. 05P778‐BSR‐701 (resistant) and 06P830‐(F5)‐BSR‐5 (susceptible) for stems and ATC 866 (resistant) and ATC 5347 (susceptible) for leaves. On both resistant and susceptible genotypes, light and scanning electron microscopy showed P. koolunga conidia infect stem and leaf tissues directly via appressoria or stomatal penetration, but with more infections involving formation of appressoria on stems than on leaves. On leaves of the resistant genotype, at 72 h post‐inoculation, P. koolunga penetrated more frequently via stomata (5.2 conidia per 36 893 μm²) than by formation of appressoria (1.8 conidia); yet no such difference was observed on stems of the resistant genotype. In contrast, at the same time point, the number of conidia infecting the susceptible genotype by formation of appressoria on either stems (135 conidia) or leaves (11.3 conidia) was significantly greater than via stomata (8 and 7.3 conidia, stems and leaves, respectively). Mean germ tube length of germinating P. koolunga conidia on both stems (29.8 μm) and leaves (32.9 μm) of the resistant genotype was less than on the susceptible genotype (40.5 and 63.7 μm, stem and leaves, respectively). In addition, there were differences in the number of germ tubes emerging from conidia on resistant and susceptible genotypes. These are the first insights into the nature of leaf and stem resistance mechanisms operating in field pea against P. koolunga.  相似文献   

Ecological Environmental Variability Influence Growth and Yield Potential of Rice under Northern Climatic Scenario     

Imran 《Russian Agricultural Sciences》2018,44(1):18-24

To evaluate the response of various rice genotypes to environmental variability and fluctuation in temperature for growth and development of the plant, an experiment was conducted at Agriculture Research Institute (N) Mingora Swat, Pakistan, during summer 2011. The site is located at 34° and 36° North latitude and 72° and 73° East longitude and at an altitude of 975 m above sea level. Experimental site falls in temperate region where the average annual precipitation is ranges from 1000 to 1200 mm. Seven genotypes (PARC 403, OM5627, IR64, IR8225-9-3-2-3, CIBOGO, GA-5015, and Fakhre Malakand) were evaluated for growth and yield parameters in respect of seasonal variation of transplanting. Five transplanting dates, (D1 = 25th May, D2 = 9th June, D3 = 24th June, D4 = 9th July, and D5 = 25th July) were used during the study. Results divulge that optimum temperature for well growth and development was found on D2 (9th June), taken less number of days to 50% flowering (72), less number of days taken physiological maturity (112), produced taller plant height (88.62 cm), maximum tiller plant^–1 (20.3 cm), panicle length (22.0 and 22.0 cm), paddies panicle^–1(191 and 193), 1000 paddy weight (18.15 and 18.16 g) and paddy yield (5.65 and 5.53 t ha^–1) respectively. As the transplanting was delayed decreased in yield contributing parameters was noted. Panicle length (17.9 cm), paddies panicle^–1 (176.14) and paddy yield (4.12 t ha^–1) was observed when transplanting was done on D5, while D1 and D4 were at par valued in tiller plant^–1, Panicle length, 1000 paddy weight, and paddy yield respectively. Fakhre-e-Malakand was found best among the tested genotypes for early maturity, maximum plant height, highest tillers plant^–1 (22.2), panicle length (21.8 cm), paddies panicle^–1 (197.7), 1000 paddy weight (19.2 g) and paddy yield (6.49 t ha–1) under the northern climatic scenario.  相似文献   

Maize productivity and soil carbon storage as influenced by wheat residue management     

Ahmad Khan  Naeem Ali  Sajid Iqbal Haider 《Journal of plant nutrition》2018,41(14):1868-1878

Wheat (Triticum aestivum L) residue removed, burnt, or incorporated with or without 0, 60, and 120 kg nitrogen (N) ha^?1 effects on maize (Zea mays L) hybrids (Pioneer-3025, Pioneer-30P45, and Kiramat) were assessed at University of Agriculture, Peshawar, Pakistan during 2010 and 2011 for maize production and soil carbon (C) storage. Pioneer-30P45 had higher grain yield, leaf area, and delayed maturity. Residue burning combined with 120 kg N ha^?1 produced higher grain yield. The leaf area, leaf area ratio, grain N content, and solar radiation interception were improved with N + residue burnt/incorporated over control. The grain yield was positively correlated with yield parameters. Soil organic carbon (SOC) content were in order of incorporated > burnt > removed at all growth stages (i.e., sowing, tasseling, maturity, and harvesting). Conclusively, wheat residue burnt/incorporated into the soil with 120 kg N ha^?1 was best for maize production of Pioneer-30P45; however residue incorporation into the soil improved SOC.  相似文献   

Phenotypic divergence in vegetable amaranth for total antioxidant capacity,antioxidant profile,dietary fiber,nutritional and agronomic traits     

Umakanta Sarker  Md. Tofazzal Islam  Md. Golam Rabbani 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2018,68(1):67-76

A lot of variations in vegetable amaranth germplasm have been observed in Bangladesh. It has been used as a cheap source of antioxidants, nutrients, protein, and dietary fiber. But no efforts had not been taken to know the status of antioxidant content, polyphenol, flavonoid, antioxidant vitamins and minerals, dietary fiber, nutritional and agronomic traits. In this study, Forty-three vegetable amaranth genotypes were evaluated to determine the status of total antioxidant content, polyphenol, flavonoid, antioxidant vitamins and minerals, dietary fiber, nutritional and agronomic traits and the magnitude of genetic diversity based on the contribution of those traits for meaningful grouping and proper utilization in future breeding program. The experiment was carried out in an open experimental field at Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh in a randomized complete block design with three replications. Multivariate (Principal component and cluster) analysis was done using numerical taxonomic techniques of Sneath, & Sokal. Four principal components contributed 98.61% of the variation. Biological yield and total antioxidant content was strongly associated with their related all agronomic traits. Total flavonoid content had a higher contribution to total antioxidant capacity compared to vitamin and mineral antioxidants. Contribution of antioxidant profile and agronomic traits was the highest in diversity of vegetable amaranth. Both high and low yielding genotypes had a high antioxidant profile. Therefore, high yielding genotypes (From cluster VI) could be used directly as high antioxidant profile varieties and low yielding genotypes as a source of donor parents in hybridization program. Cluster analysis grouped the genotypes into six clusters. The diverse genotypes in different clusters were identified. Genotypes with desirable genes of one cluster hybridized with promising genotypes of other diverge clusters could facilitate the accumulation of favorable genes in hybrids.

Abbreviations: PCA: principal component analysis; PC: principal component; dw: dry weight; TFC: total flavonoid content; TAC: total antioxidant capacity; TPC: total polyphenol content; K: potassium; Ca: calcium; Mg: magnesium; Fe: iron; Mn: manganese; Cu: copper; Zn: zinc  相似文献   

Integrated use of biological approaches provides effective control of parthenium weed     

Asad Shabbir  Kunjithapatham Dhileepan  Myron Zalucki  Naeem Khan  Steve Adkins 《Archives of Agronomy and Soil Science》2018,64(13):1861-1878

Parthenium weed (Parthenium hysterophorus L.; Asteraceae) is an invasive weed species in agro-ecosystems. It causes huge losses to native biodiversity and agricultural productivity. This study was conducted to assess the combined effect of a leaf-feeding beetle, (Zygogramma bicolorata Pallister; Chrysomelidae) and suppressive plant species, bull Mitchell grass (Astrebella squrossa C.E. Hubb.; Poaceae) or butterfly pea (Clitoria ternatea L.; Fabaceae) on parthenium weed under shade house conditions. The suppressive plant species significantly reduced the parthenium weed height (16%), biomass (29%) and seed production (42%), in the absence of Z. bicolorata. However, this suppressive ability was further enhanced in the presence of Z. bicolorata. The combined effect of the suppressive plant species and Z. bicolorata further reduced the parthenium weed height (46%), biomass (66%) and seed production (95%). The combination also had a significant negative effect upon seed fill, decreasing the reproductive output of the current generation. The presence of Z. bicolorata also had positive effect on the biomass (10%) and plant height (11%) of both suppressive species. So, the combined use of suppressive plant species and the biological control agent suppressed parthenium weed more effectively than their sole use. Such integrated approaches should be prioritized for future management of parthenium weed.  相似文献   

The efficacy of Beauveria bassiana,jasmonic acid and chlorantraniliprole on larval populations of Helicoverpa armigera in chickpea crop ecosystems          下载免费PDF全文

Aneela Younas  Waqas Wakil  Zaeema Khan  Muhammad Shaaban  Sean Michael Prager 《Pest management science》2017,73(2):418-424

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Significant effect of NSP‐ase enzyme supplementation in sunflower meal‐based diet on the growth and nutrient digestibility in broilers          下载免费PDF全文

M. Bilal  M. A. Mirza  M. Kaleem  M. Saeed  Md. Reyad‐ ul‐ferdous  M. E. Abd El‐Hack 《Journal of animal physiology and animal nutrition》2017,101(2):222-228

The response of broiler chickens to 3 levels of sunflower meal and 2 levels of NSP‐ase enzyme combination (with and without) was investigated in 3 × 2 factorial arrangement under complete randomized design (CRD). A total of 240 Hubbard broiler chicks were fed on practical mash diets having 2950 kcal of ME and 21% CP from 1 to 42 days of age. The BW gain was not significantly reduced when 25% SFM was added in the diets during 1 to 42 days of age. Supplementation of NSP‐ase in broiler diets (day 1–42 overall) demonstrated non‐significant differences (p < 0.05) across the treatments in terms of FI and BWG. The difference in feed:gain at 15% or 20% SFM was observed to be non‐significant. Replacement of SBM with SFM or inclusion of SFM at higher level (25%) increased/deteriorated FCR. The addition of exogenous NSP‐ase showed a significant improvement (p < 0.01) in feed:gain. The improvement was clearly demonstrated when SFM was added to the experimental diet at 15% or even 20%. Supplementation of NSP‐ase at the 25% inclusion level could not, however, sustain the beneficial effect, which was possibly due to excessively high dietary CF. No difference was noted across the treatments regarding carcass response. Relative gizzard weight and intestinal weight were observed to be improved in birds consuming higher levels of SFM (p = 0.00). The digestibility of CF was observed to improve when SFM was used at 20% and 25% in the diets. No improvement in the digestibility of CF was observed with NSP‐ase supplementation, which meant other factors were clearly involved. Supplementation of NSP‐ase improved FCR up to 20% SFM. At 25% SFM, no improvement in the digestibility of CF was observed with NSP‐ase supplementation.  相似文献   

Optimization of tissue and time for rapid serological and molecular detection of <Emphasis Type="Italic">Apple stem pitting virus</Emphasis> and <Emphasis Type="Italic">Apple stem grooving virus</Emphasis> in apple’     

Sajad Un Nabi  Javid Iqbal Mir  Om Chand Sharma  Desh Beer Singh  Shafia Zaffer  Muneer Ahmad Sheikh  Lubna Masoodi  Kamran Ahmed Khan 《Phytoparasitica》2018,46(5):705-713

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Replacement of fishmeal with commercial soybean meal and EnzoMeal in juvenile barramundi Lates calcarifer          下载免费PDF全文

Zhenhua Ma  Md Mahbubul Hassan  Laetitia Allais  Tao He  Sophie Leterme  Amanda V. Ellis  Barry McGraw  Jian G. Qin 《Aquaculture Research》2018,49(10):3258-3269

This study investigates the impact of fishmeal replacement by soybean meal (SM) and improved SM known as EnzoMeal (EZ) on fish growth performance. The SM and EZ were used in five experimental diets: fishmeal (600 g/kg) as the control diet, 50% fishmeal replaced with soybean meal (SM50), 50% fishmeal replaced with EnzoMeal (EZ50), 100% fishmeal replaced with soybean meal (SM100) and 100% fishmeal replaced with EnzoMeal (EZ100). Fish in the control group gained the most weight, followed by those under the SM50 and EZ50 diets, while the least weight gain was observed in fish fed the SM100 and EZ100 diets. The specific growth rate (SGR) was higher in the control, but was not different between fish fed SM50 and EZ50, or between SM100 and EZ100. The highest feed intake occurred in the control but decreased sequentially from fish fed SM50 to fish fed EZ50, EZ100 and SM100. Protein digestibility was best in SM50, poorest in EZ100, but no difference between the control, EZ50 and SM100 diets. This study indicates that EnzoMeal, containing high crude protein (56%), is a potential source of plant meal to replace fishmeal in the barramundi diet, but low feed intake is a challenge when EnzoMeal is >300 g/kg.  相似文献   

Production risk of pangas (Pangasius hypophthalmus) fish farming     

Akhtaruzzaman Khan  Kristin Helen Roll 《Aquaculture Economics & Management (Blackwell Science)》2018,22(2):192-208

Pangas is a relatively new and fast-growing fish species that has great potential for production and export growth in Bangladesh. However, production variability exists from farm to farm and location to location, which indicates that production risk may be a problem in pangas farming. Research on production risk is therefore of great importance, especially for small-scale farming systems in developing countries, where farmers are more vulnerable to risk. This study investigates the production risk of pangas farming in selected areas of Bangladesh. A Just–Pope stochastic production function is chosen to estimate the mean and risk functions. The test result shows that significant production risk exists in pangas farming, and that the risk differs between small and large farms.  相似文献