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Home > Studies on Biochemical Basis of Resistance Against Late Blight of Potato and its Management Through Fungicides, Bio- Fungicides, and Plant Extracts

Studies on Biochemical Basis of Resistance Against Late Blight of Potato and its Management Through Fungicides, Bio- Fungicides, and Plant Extracts

Thesis Info

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Author

Nasir Subhani, Muhammad

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2014

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/2340/1/2819S.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727278693

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Present studies were carried out to screen potato lines/cultivars against late blight, determine the effects of late blight on mineral nutrients and phenolic contents of susceptible and resistant potato cultivars, and manage late blight of potato. Out of 61 varieties/lines tested under natural disease conditions none of the variety/line was found to be immune, highly resistant or resistant to late blight of potato. Thirteen varieties/lines exhibited moderately resistant, thirteen exhibited moderately susceptible, twenty five showed susceptible, and ten showed highly susceptible response. Total phenols detected one month pre and post disease appearance in 50 lines/cultivars. After infection with late blight disease, total phenols significantly increased in all the diseased plants more than the increase in healthy plants of same age. We found an increase in nitrogen, phosphorus, magnesium, copper, and zinc contents of healthy plants of susceptible varieties/lines whereas, potassium, calcium, sodium and iron contents higher in the healthy plants resistant cultivars/lines. Upon disease appearance nitrogen, sodium, potassium, calcium, copper, zinc, and iron contents increased invariably in all plants of both susceptible and resistant cultivars/lines. On the other hand, phosphorus and magnesium contents increased in susceptible cultivars/lines but decreased in resistant cultivars/lines. Control efficiency of Ridomil Gold and Neem (Azadrachta indica) leaf extract, as protective and curative was more pronounced on moderately resistant cultivar (Shanan) as compared to highly susceptible (Karoda). By sowing moderately resistant cultivars and spraying Neem leaf extract or Garlic extract @3% or moderately resistant varieties/lines combined with half the recommended dose of fungicides can protect the crop efficiently. Fungicide application (Ridomil Gold or Melody Dew) should be done at the appearance of disease just for once or twice to reduce the damage to environment and creation of resistance in the pathogen. Our study suggests that resistant cultivars should be exploited with fungicide use to enhance the disease control and disease losses.
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قاضی عبدالودود

قاضی عبدالودود
(عبدالرحمن پرواز اصلاحی)
پروفیسر کلیم الدین احمد کے انتقال کے بعد اردو دنیا کو دوسرا بڑا صدمہ مشہور محقق قاضی عبدالودود کی وفات سے پہنچا، قاضی صاحب نے ۲۵؍ جنوری ۱۹۸۴؁ء کو پٹنہ میڈیکل کالج میں ۸۸ برس کی عمر میں رحلت فرمائی۔ وہ بھی ایک علمی و دینی خاندان کے چشم و چراغ تھے، میر زاہد پر حاشیہ لکھنے والے ملا غلام یحییٰ بہاری آپ کے اجداد میں تھے، ملا غلام یحییٰ کے بیٹے قاضی کمال الحق شعروسخن کا ذوق رکھتے تھے اور ناصرعلی کے پیرو تھے۔ ان کے پوتے قاضی اکرام الحق حضرت سید احمد شہیدؒ کے مریدوں میں تھے، ان کے بھائی واعظ الحق ان علماء میں سے تھے، جو شورش کے زمانہ میں نظربند کئے گئے، قاضی اسمٰعیل قاضی اکرام الحق کے بیٹے اور موزوں طبع شخص تھے جو اردو اور فارسی دونوں میں شاعری کرتے تھے، ان کے بیٹے قاضی عبدالحمید قاضی عبدالودود کے دادا تھے اور والد قاضی عبدالوحید عالم دین تھے، مگر ان میں تبدیلی آئی اور عقائد میں بریلوی ہوگئے، اس لئے انھوں نے اپنے عقائد و خیالات کی تبلیغ کے لئے ایک ماہانہ رسالہ ’’تحفہ‘‘ نکالا تھا، وہ شاعر بھی تھے اور وحید الہ آبادی کی صحبت پائی تھی، ان کا اردو کلام گلدستوں میں ملتا ہے، ان کی وفات ۱۳۲۶؁ھ میں ہوئی۔
قاضی عبدالودود ۱۸۹۶؁ء میں پٹنہ کے اندر پیدا ہوئے، ابتدائی تعلیم پرانے طریقہ پر پائی۔ انگریزی شروع کرنے سے پہلے قرآن مجید حفظ کیا، پھر عربی صرف و نحو اور منطق میں متوسطات تک کی کتابیں پڑھیں، اس کے بعد وہ پٹنہ کے محمڈن اسکول میں داخل ہوئے، اس اسکول میں سال ڈیڑھ سال رہنے کے بعد میجر سید حسن بلگرامی ٹیوٹوریل کالج علی گڑھ گئے، وہاں ان میں کتب بینی کا شوق بڑھا۔ بے شمار کتابوں اور رسالوں کو پڑھا۔ پھر پٹنہ...

Meningkatkan Kinerja Karyawan dengan Kecerdasan Emosional dan Kemampuan Kerja di Kota Dumai

Penelitian ini dilaksanakan pada Perushaaan Kontraktor dan Suplayer di Kota Dumai yang kinerja karyawannya kurang baik karena banyak perkejaan yang tidak diselesaikan sesuai dengan yang diberikan oleh perusahaan  Tujuan Penelitian ini melihat apakah Kinerja di Perusahaan ini dipengaruhi oleh Kecerdasan Emosional dan Kemampuan Kerja, Jumlah Sampel dalam Penelitian ini sebanyak 59 Orang Karyawan Perusahaan di Kota Dumai menggunakan Metode Sensus dimana Seluruh Karyawan dijadikan Sampel Penelitian , Metode Pengumpulan Data menggunakan Kuesioner dan Intervieew kepada Pimpinan Perusahaan di Kota Dumai, Teknik Analisis Data menggunakan Analisis Deskriptif Kuantitatif , Hasil dalam Penelitian ini Nilai korelasi (R) yang dihasilkan adalah sebesar 0,812. Maka dapat disimpulkan bahwa terdapat hubungan yang sangat kuat antara variabel independen terhadap variabel dependen. Sedangkan nilai R Square sebesar 0,659. Hal ini menunjukkan bahwa variabel Kecerdasan Emosional dan Kemampuan Kerja secara keseluruhan memberikan pengaruh sebesar 65,9% terhadap variabel Kinerja, Sedangkan sisanya sebesar 34,1% dipengaruhi oleh variabel lain yang tidak diteliti dalam Penelitiian ini.

Acomparative Empirical Investigation of the Validity of the Traditional Capm, the Higher-Moment Capm and the Downside Risk Based Capm in the Emerging Equity Market of Pakistan

Though there is plethora of asset pricing models proposed to explain the cross-section of asset returns, however, these models require ideal perfect conditions which are grossly present in developed markets of the world. The present study aims to investigate the empirical validity and comparative performance of the traditional capital asset pricing model (CAPM), the higher- moment CAPM and the downside risk based CAPM in explaining the cross section of stock returns in the emerging equity market of Pakistan. Given the acclaimed theoretical supremacy of the downside risk based CAPM it is expected to perform better at explaining the cross-section of stock returns in the Pakistani equity market, i.e. KSE. For empirical analysis, this study uses the Fama-MacBeth methodology (Fama & MacBeth, 1973). Accordingly a sample of 313 stocks from 30 different sectors listed on the Karachi stock exchange is used to form portfolios and the KSE100 index is used as a proxy for the market portfolio. Monthly data on all the variables was obtained over sample period July 2000 to June 2011. The six month’s Treasury bills rate is used as a proxy for the risk free rate. Time series regression and cross sectional regression techniques are used for empirical analysis in line with the Fama-MacBeth methodology. To overcome the problem of heteroskedasticity in the cross sectional regression, the models are estimated using two alternative techniques; white heteroskedasticity-consistent standard errors and covariance matrix and generalized least squares (GLS). Further the traditional CAPM and the higher- moment CAPM are also estimated in the conditional form using generalized autoregressive conditional heteroskedasticity (GARCH) model. The findings of the present study on the empirical validity of the traditional CAPM, the higher- moment CAPM and the downside risk based CAPM are mostly mixed and inconclusive. This implies that though the downside risk based CAPM may have a stronger theoretical background; however, empirically it performs no differently than the traditional CAPM and higher-moment CAPM in explaining the cross section of stock returns in the KSE. In the empirical estimation of all the models, the intercept terms has been mostly found to be statistically insignificant which evidences the absence of consistent mispricing at the KSE over the sample period. This finding is consistent with the underlying theories of the traditional CAPM, the higher-moment CAPM and the downside risk based CAPM which state the hypothesis that the intercept term should be xvistatistically insignificant. The findings of the study suggest that there is no statistically significant risk premium for systematic risk as defined in traditional CAPM, higher-moment CAPM and the downside risk based CAPM over the full and sub-sample periods. However, the unconditional systematic risk in the traditional CAPM has been found to positive and statistically significant over the sub-sample period of July 2007 to June 2009 using GLS as estimation technique. The findings of the present study show that co-skwness and co-kurtosis risks are mostly insignificantly priced in conditional and unconditional form over the full and sub-sample periods. However, over the sub-sample period of June 2007 to July 2009, the unconditional co- skewness risk is negatively and statistically significantly priced, using white heteroskedasticity- consistent standard errors and covariance matrix in the cross-sectional regression, which is consistent with the theory of higher-moment CAPM. The co-skewness risk has also been shown to be marginally statistically significantly (at 10 percent) and correctly priced over the full sample period using the three moment specification using white heteroskedasticity-consistent standard errors and covariance matrix. The findings also revealed that co-kurtosis risk is positively and statistically significantly priced over the sub-sample periods of July 2003 to February 2006 and July 2003 to June 2005 using GLS as estimation technique in the cross sectional regression. Based on the major findings of the present study, it is concluded that there is lack of substantive evidence to validate any of the competing asset pricing theories i.e. the traditional CAPM, the higher-moment CAPM and the downside risk based CAPM in the KSE. Hence it may be implied that the KSE is an inefficient equity market and does not provide a fair risk-return trade-off. It implies that any diversification based on the underlying theory of any of the asset pricing models investigated in the present study may result in poor investment performance and losses. Investors should give more attention to obtain and analyze information that is adequate, accurate and timely. The stock markets in Pakistan should be demutualized to reduce the role of insider trading, private information as well as speculation and manipulation of the market by few influential market players. For future research the market micro-structure may be considered and investigate to explain the cross-section of stock returns in the KSE.