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排序方式: 共有133条查询结果,搜索用时 15 毫秒
1.
Muhammad Faisal Bilal Muhammad Ashfaq Wahid Amir Shakeel Andrew French Muhammad Sarwar 《Journal of plant nutrition》2017,40(14):1978-1992
Commercial cultivation of Bt cotton produced higher boll load which led to stiff inter-original competition for photosynthates, resulting in early cessation of growth (premature senescence) due to more availability of sink and less sources. To overcome this problem, field experiment was conducted during 2011 and 2012 using five treatments of plant growth manipulation viz. no fruiting branch removal (F1), removal of first fruiting branch (F2), removal of first and second fruiting branch (F3), removal of all squares from first fruiting branch (F4), removal of all squares from first and second fruiting branches (F5), and three potassium (K) application rates viz. 50 kg ha?1 (K1), 100 kg ha?1 (K2), and 150 kg ha?1 (K3). More nodes above white flower were recorded in F5, followed by F3, while minimum were recorded in F1. Among potassium levels, maximum nodes above white flower were recorded in K3 followed by K2 and K1 during both years of study. Plant height recorded at physiological cutout stage or at maturity stage showed that plants gained more height with removal of all squares from first tosecond fruiting branches with higher potassium dose. Leaf K increased with increasing applied potassium and also with square/branch removal. So early removal of squares/fruiting branches along with higher potassium dose helped in delaying canopy senescence in Bt cotton. 相似文献
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Production of Antibody in Mammary Gland of Pregnant, Non-Lactating and Lactating Cows, Evoked by Polyvalent Antigen with Reference to Dosage and Frequency of Immunization 总被引:1,自引:1,他引:0 下载免费PDF全文
Sixteen cows were used in a series of experiments to test dose, route and frequency responses in the production of milk and serum agglutinins to a spectrum of 9 proven bovine pathogens. The bacterial species were: Pasteurella multocida (2 isolates), Escherichia coli, Staphylococcus aureus, Staphylococcus albus, Streptococcus sp., Corynebacterium sp., Salmonella enteriditis, and Aerobacter aerogenes. Primary immunizations were made either through the teat canal or intramuscularly. “Booster” injections were made through the teat canal. Agglutinins in the blood appeared only after a week or more. In the milk, titers were recorded in 1 or 2 days following primary immunization. Variation of titer in the blood and milk was somewhat independent. In all but 1 cow, antibody was produced against each organism in milk and blood serum. Udder inflammation was observed in the experiments when a 15-day interval separated immunizations. Inflammation was minimal in the experiments employing the 7-day interval of immunization. A positive Whiteside test was observed following most injections, even where no other clinical signs of reaction were seen. The findings are discussed in relation to the previous literature. 相似文献
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Light microscopic studies have established the existence of salt glands on “Kallar grass”; leaf blades. The salt glands resembled the two‐cell type structure described for some halophytic genera within the Gramineae. The secreted salts crystallized and formed whiskers when the plants were grown under continuously high saline conditions. The salt secretion appears to be selective. The secretion of Na exceeded that of K and considerable quantities of Cl were also extruded, preferentially in concomitance with Na. The significance of growth hormones and Ca in regulating the salt secretion process is discussed. 相似文献
6.
F E McDonough F H Steinke G Sarwar B O Eggum R Bressani P J Huth W E Barbeau G V Mitchell J G Phillips 《Journal of the Association of Official Analytical Chemists》1990,73(5):801-805
Eight laboratories participated in a collaborative study to estimate precision of a standardized rat assay for determining true protein digestibility in selected animal, fish, and cereal products. Each of 7 test protein sources (casein, tuna fish, macaroni/cheese, pea protein concentrate, rolled oats, pinto beans, and nonfat dried milk) was fed as the sole source of protein at a 10% protein level in mixed diets. Each diet was fed to 2 replicate groups of 4 rats each for a 4-day acclimation period and a 5-day balance period. Mean digestibilities ranged from 98.6% for casein to 72.6% for pinto beans. Repeatability standard deviations ranged from 0.5 to 2.0%; the mean relative standard deviation for repeatability was 0.9% (range 0.5-2.8%). Reproducibility standard deviations ranged from 1.2 to 3.2%, and the mean relative standard deviation for reproducibility was 2.4% (range 1.3-4.4%). The method has been approved interim official first action for determining true protein digestibility in foods and ingredients. 相似文献
7.
Glutathione (GSH) abundantly presents in plant and affects plants growth and development. To justify if GSH affects copper (Cu)-induced corn production, photosynthesis (Pn) rate, and photosynthetically active radiation (PAR), chlorophyll (Chl) content and Chl fluorescence, relative water content (RWC) and yields were evaluated. Different Cu concentrations (0, 0.2, 1.5 and 3.0 ppm of Zn) with or without 100 µm of N-acetyl cysteine (NAC) were arranged as completely randomize design with 5 replications. Results showed that both NAC and Cu affected plant height and leaf numbers. Copper reduced Pn rate, and PAR and increased RWC but no effect was observed on Chl content and Chl fluorescence in leaves. On the other hand, NAC application increased Pn, PAR, Chl parameters regardless of Cu treatment. In the presence of 1.5 ppm of Cu, corn plants showed improve yield and cob length irrespective to NAC treatment. Taken together, this study suggests that NAC might improve some physiological functions in plants to enhance Cu-induced corn production. 相似文献
8.
Summary The competitive ability of inoculated and indigenous Rhizobium/Bradyrhizobium spp. to nodulate and fix N2 in grain legumes (Glycine max, Vigna unguiculata, Phaseolus vulgaris) and fodder legumes (Vicia sativa, Medicago sativa, and Trifolium subterraneum) was studied in pots with two local soils collected from two different fields on the basis of cropping history. The native population was estimated by a most-probable-number plant infectivity test in growth pouches and culture tubes. The indigenous rhizobial/bradyrhizobial population ranged from 3 to 2×104 and 0 to 4.4×103 cells g-1 in the two soils (the first with, the second without a history of legume cropping). Inoculated G. max, P. vulgaris, and T. subterraneum plants had significantly more nodules with a greater nodule mass than uninoculated plants, but N2 fixation was increased only in G. max and P. vulgaris. A significant response to inoculation was observed in the grain legume P. vulgaris in the soil not previously used to grow legumes, even in the presence of higher indigenous population (>103 cells g-1 soil of Rhizobium leguminosarum bv phaseoli). No difference in yield was observed with the fodder legumes in response to inoculation, even with the indigenous Rhizobium sp. as low as <14 cells g-1 soil and although the number and weight of nodules were significantly increased by the inoculation in T. subterraneum. Overall recovery of the inoculated strains was 38–100%, as determined by a fluorescent antibody technique. In general, the inoculation increased N2 fixation only in 3 out of 12 legume species-soil combinations in the presence of an indigenous population of rhizobial/bradyrhizobial strains. 相似文献
9.
Mahr-un-Nisa Shahzad MA Phillips CJ Sarwar M 《Tropical animal health and production》2012,44(5):947-952
Urea is a common ingredient of the diets of intensively fed lambs, but is increasingly required for industrial processes.
Maize steep liquor (MSL) is a by-product of maize grain degradation to produce starch that may be a suitable replacement.
Fifty growing lambs were fed on equinitrogenous diets in which between 0% and 80% of the urea was replaced by MSL; their growth
and metabolism were recorded over 70 days. Increasing replacement of urea by MSL increased feed intake and nutrient digestibilities,
leading to increased growth rates, more efficient feed conversion, and increased nitrogen retention. Concentrations of triiodothyroxin,
thyroxin, glucose, and methionine were increased by replacement of urea by liquor, and plasma urea was reduced. This study
suggests that MSL is a suitable replacement for up to 80% of urea in the diet of rapidly growing lambs. 相似文献
10.
Comparative analysis of organelle DNAs in acid citrus grown in Japan using PCR-RFLP method 总被引:1,自引:0,他引:1
Asad Asadi Abkenar Shiro Isshiki Ryoji Matsumoto Yosuke Tashiro 《Genetic Resources and Crop Evolution》2008,55(4):487-492
PCR-RFLP analyses of three regions for each of chloroplast DNA (cpDNA; rbcL-ORF106, trnD-trnT, trnH-trnK) and mitochondrial DNA (mtDNA; nad7/exon2-exon3, nad7/exon3-exon4, 18S-5S) were performed in 26 cultivars of acid citrus grown in Japan to identify polymorphisms and classify them. The polymorphisms
were compared with those of three true Citrus species, i.e., mandarin, pummelo and citron. Ichang papeda (C. ichangensis) was also included in this study to find its relationship with Yuzu. Inter-species cpDNA variation was recognized and the
acid citrus were divided into three groups, namely; I (‘Yuzukichi’ and ‘Kinkoyu’), II [sour oranges (‘Kaiseito’, ‘Daidai’
and ‘China daidai’), ‘Nansho daidai’, ‘Kiku daidai’, C. sudachi (‘Mushi yukaku’, ‘Yushi yukaku’ and ‘Yushi mukaku’), C. sphaerocarpa (‘Kabosu’ and ‘Aka kabosu’), C. kizu (‘Taninaka kizu’, ‘Kinosu’ and ‘Kizu’), ‘Zanbo’, ‘Mochiyu’, ‘Jabara’ and ‘Naoshichi’], and III [Yuzu (‘Tetraploid’, ‘Tochikei
yuzu’ and ‘Yamanekei yuzu’), ‘Matsuda sudachi’, ‘Zuishoyu’, ‘Hanayu’ and ‘Yuko’]. CpDNA restriction patterns of the three
true Citrus species differed from each other as well as from those of ichang papeda. CpDNA restriction patterns of group I of the acid
citrus were identical to those of mandarins. Group II showed the same as pummelos. CpDNA restriction patterns of group III
were differed from those of the three true Citrus species in the three regions. This group was differed from ichang papeda after digestion of trnH-trnK PCR products with TaqI, HinfI and AluI, while they showed identical restriction patterns in two regions, rbcL-ORF106 and trnD-trnT. Citrons and ichang papeda were placed in groups IV and V, respectively. Based on mtDNA restriction patterns, the acid citrus
were divided into three groups; i, ii and iii. In groups i and ii accessions of groups I and II of cpDNA were placed with
mandarins and pummelos, respectively. In group iii accessions of group III of cpDNA were placed with ichang papeda. Citrons
were placed in a distinct group, iv. 相似文献