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51.
S. S. Dey Kanika Sharma R. Bhatia Dey G. M. Sandeep Kumar Dinesh Singh Raj Kumar Chander Parkash 《Euphytica》2015,204(1):149-162
52.
Girish Sharma V. Dinesh Kumar A. Haque S.R. Bhat Shyam Prakash V.L. Chopra 《Euphytica》2002,125(3):411-417
Development of leaf spot resistant mustard cultivars is a relevant objective in view of heavy crop losses caused by this pathogen.
Thirty-eight species belonging to 9 genera, including cultivated and wild allies, of the genus Brassica were evaluated under epiphytotic conditions for two years. Inoculations were done on whole plants (in vivo) and on detached leaves (in vitro). Data on incubation period, number of lesions per leaf, lesion size and leaf area covered by lesions were recorded. Species
which never produced disease symptoms throughout the growing period in pots and until 72 hours after inoculation in detached
leaf assays during both years were treated as resistant, while those that produced symptoms were classified as moderately
resistant, susceptible or highly susceptible depending upon incubation period, size of lesions and leaf area covered by disease
symptoms. Eight species (Brassica desnottesii, Camelina sativa, Coincya pseuderucastrum, Diplotaxis berthautii, D. catholica, D. cretacea, D. erucoides, and Erucastrum gallicum) were found completely resistant, whereas others were classified as moderately resistant (12), susceptible (11) or highly
susceptible (9). Since resistance is unavailable within the cultivated species, these 8 resistant wild species could be used
as donor parents for introgressing resistance to leaf spot disease in Indian mustard.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
53.
The pink hibiscus mealybug Maconellicoccus hirsutus (Green) (Hemiptera: Pseudococcidae) is a major pest of economically important crops. The apefly Spalgis epius (Westwood) (Lepidoptera: Lycaenidae) is a potential predator of various species of mealybugs. Studies of its preying potential
and preference for prey stages on M. hirsutus are incomplete. An investigation was undertaken to determine the daily prey consumption and preference for prey stages by
different larval instars of S. epius reared on M. hirsutus in the laboratory. During the 8-day larval development period with four larval instars of S. epius, the daily prey consumption increased from the first to the seventh day and decreased on the eighth day prior to the prepupal
stage. Generally, there was a significant difference in the prey consumption on different days. The 1st to 4th instar larvae
of S. epius consumed, respectively, a mean of 181.3, 679.1, 1770.4 and 4333.0 eggs or 19.1, 67.7, 153.0 and 639.0 nymphs or 2.72, 6.26,
13.8 and 32.1 adults of M. hirsutus. When an S. epius larva was fed on M. hirsutus eggs, nymphs and adults separately, it consumed a mean of 6952.6 eggs, 878.8 nymphs or 53.9 adults during its entire development.
A single larva of S. epius consumed 2358.3 eggs, 151.2 nymphs and 34.3 adults of M. hirsutus during its entire development when the prey stages were offered all together. The study revealed that S. epius is a voracious predator of M. hirsutus and thus could be utilized as a potential biological control agent. 相似文献
54.
Prankanu Debnath Saroj Kumar Pattanaaik Dinesh Sah Ajai Kumar Pandey 《Archives of Agronomy and Soil Science》2013,59(11):1649-1658
A study was conducted with 24 piedmont soils of Arunachal Pradesh (India) to estimate the critical limit of available boron (B) in soil and cowpea plant for predicting the response of cowpea (Vigna unguiculata L. Walp.) to B application. The critical concentration of available B in these soils was established by graphical procedure at 0.48 mg kg?1 for soil and at 24.5 mg kg?1 in the plant tissues. Soil containing available B below the critical limit responded appreciably to B fertilization. A negative response to B application was also observed in soils at higher level of available B. The average dry matter yield increased with the increasing level of B application up to 1.5 mg kg?1. The yield response to B application in cowpea on B deficient soils was 34.5%. Based on the critical value of 0.48 mg kg?1, 10 soils were rated to be adequate and 20.0% soils belonging to this category responding to B application, whereas 85.7% soils below the critical value showed a positive response to B application. The hot water soluble B was significantly and positively correlated with organic carbon, cation exchange capacity and clay contents and negatively correlated with pH, silt and sand contents of soils. 相似文献
55.
The interaction between Telone, a pesticide, 1,3-dichloropropene, and acid- and base-taturated illites has been studied with the help of adsorption isotherms, desorption, pH, electrical conductivity, X-ray, and infrared spectra. The results furnished adsorption isotherms with three clearly defined portions: an ‘H’ curve, a ‘C’ curve, and a subsequent ‘H’ portion. The curvei represented a process of chemisorption of the nematocide followed by slow penetration of the substrate micropores by the solute at the planes, edges, and corners of illite structure. The results were in accordance with the existence of three ‘'sites'’ of different reactivities on the illite surface. A reaction mechanism for the process of chemisorption has been proposed. 相似文献
56.
Rathore Avinash Chandra Mehta Harsh Islam Sadikul Saroj P. L. Sharma N. K. Jayaprakash J. Gupta A. K. Dubey R. K. Ghosh B. N. Prasad Ram Kumar Dinesh Raizada A. 《Agroforestry Systems》2021,95(8):1563-1575
Agroforestry Systems - This study aims to develop predictive models for standing stocks of biomass and carbon of an entire tree based on harvested biomass in mango (Mangifera indica L.) alongwith... 相似文献
57.
Field studies were conducted at the Central Potato Research Institute Campus, Modipuram (India), during two seasons (2003–2004
and 2004–2005), with two processing cultivars (cvs Kufri Chipsona-1 and Kufri Chipsona-2) and nine combinations of potassium
source (K-chloride, K-sulphate and K-nitrate) and time of K application (basal dressing, split application and split application
+ foliar spray) to investigate their effect on tuber yield and processing attributes for crisp production under subtropical
conditions. Yearly variations were observed for most of the variables studied. Between cultivars, the tuber and biomass yield
was higher in cv. Kufri Chipsona-1, whereas specific gravity, tuber dry-matter percentage and crisp recovery were higher in
cv. Kufri Chipsona-2. Stem number, plant height and compound leaf number were not influenced by sources of K fertilizer or
application time. Processing-grade tuber yield, total tuber yield and biomass yield were statistically similar for K-chloride
and K-sulphate and lower for K-nitrate. K sources affected both specific gravity and tuber dry-matter percentage significantly;
K-sulphate and K-nitrate gave significantly higher values than K-chloride. The application time had no significant effect
on processing grade and total tuber yield or on tuber specific gravity and dry-matter percentage. Values for crisp colour
and reducing sugars were within the acceptable range for all treatments. Crisp yields were calculated to be highest and oil
percentage of the crisps to be lowest when K-sulphate was applied as K fertilizer. Net income and benefit:cost ratio were
highest for K-chloride followed by K-sulphate and lowest for K-nitrate. The study suggests that for crisping potatoes, K-sulphate
is more suited than K-chloride, as it not only increased tuber dry-matter percentage and crisp yield, but also decreased crisp
oil percentage. 相似文献
58.
A field study was conducted during 2000–2001 and 2001–2002 at the Central Potato Research Institute Campus, Modipuram, India,
in order to increasing the processing-grade tuber yield of India’s first ever developed processing potato cultivars, Kufri
Chipsona-1 and Kufri Chipsona-2. Tuber yield and post-harvest quality characteristics were evaluated in response to five N
levels (0, 90, 180, 270 and 360 kg N ha-1). The crop growth traits (stem number, plant height and compound leaf number) responded positively to N application, whereas
the effect of N fertilization on processing-grade tuber number, total tuber number per ha and tuber number per plant was quadratic.
There was a steady increase in tuber weight per plant, processing-grade tuber yield, total tuber yield and biomass yield in
response to N application. Kufri Chipsona-1 produced a 23.6% higher tuber yield per plant than Kufri Chipsona-2. Agronomic
N use efficiency decreased linearly with increased N doses. Specific gravity and tuber dry matter percentage responded positively
to N application, while crisps colour (at harvest and after storage) and reducing sugars remained unaffected. Cultivar was
the major factor that influenced the tuber quality parameters (specific gravity, crisps colour). Higher values of these quality
traits were observed in Kufri Chipsona-2 as compared to Kufri Chipsona-1. Net income and benefit cost ratio (B:C) indicated
that Chipsona cultivars should be fertilized with 270 kg N ha-1 for realizing higher processing-grade yields and desirable quality tubers. 相似文献
59.
60.
Soni VK Yadav DK Bano N Dixit P Pathak M Maurya R Sahai M Jain SK Misra-Bhattacharya S 《Fitoterapia》2012,83(1):110-116
Annona squamosa (AS) has traditionally been used as ethnomedicine. We have earlier extracted and fractionated the twigs of AS based upon its bioactivity and observed its immune potentiating activity that was localized in its three fractions. Present communication deals with the phytochemical analysis and pharmacological investigation of the most active chloroform fraction that led to isolation and identification of a number of compounds whose structures were elucidated using 1D and 2D NMR spectroscopic analysis. Amongst the twelve pure compounds isolated, five compounds Lanuginosine (1), (+) -O- methylarmepavine (2), (+)-anomuricine (3), Isocorydine (4), and N-methyl-6, 7-dimethoxyisoquinolone (5) were evaluated in vivo for their immune modifier activities in BALB/c mice after oral administration at three log doses of 0.3, 1.0 and 3.0 mg/kg for 14 consecutive days. Of these, three compounds (1, 2 and 5) showed dose dependent immune stimulating activity. However, the uppermost activity was noted in the compound N-methyl-6, 7-dimethoxyisoquinolone at the 3.0 mg/kg oral dose. The activity was assessed in the form of increased splenic T and B cellular proliferation, up-regulated CD4+, CD8+ and CD19+ cell population and accentuation in the peritoneal macrophage function. The compound possibly acted modifying the expression of Th1- and Th2- cytokines via stimulation of pro-inflammatory Th1 cytokines IL-2 and IFN-γ. These results warrant the use of the above compounds as an efficient immune-stimulant or immune-adjuvant against diseases with immune suppression. The analogs of the compound may further be chemically synthesized to achieve desired immune modifying activity. 相似文献