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Behavior of Watermelon Cultivars after Inoculation with Watermelon mosaic virus in Saudi Arabia

Journal of Agricultural Science and Technology(A) 2018年第5期8卷 306-314页

作者： ibrahim Mohamed Al-Shahwan Adyatma Irawan Santosa Omer Ahmed Abdalla Mohamed Ali Al-saleh Plant Protection Department College of Food and Agriculture SciencesKing Saud UniversityP.O.Box 2460Riyadh 11451Saudi Arabia

All seven watermelon cultivars that were screened for their reactions to a severe Saudi Arabian isolate of Watermelon mosaic virus(WMV-SA)that was found inducing a severe disease in watermelon in Riyadh region,were found to be susceptible and showed different virus-like symptoms upon mechanical *** Baby,Crimson Sweet 1 and Crimson Sweet 2 cultivars showed milder symptoms and,therefore,got lower grand mean of weekly symptom ratings than Charleston Gray No.502,Jubilee,Black Diamond and Charleston Gray No.133 in both first and second *** inoculation with this isolate significantly reduced the plant height,fresh and dry weights of the tested *** reduction percentages in plant height of Sugar Baby and Crimson Sweet 2 were significantly lower than those of Crimson Sweet 1,Charleston Gray No.502 and Charleston Gray No.133 in both *** the reduction in percentages of fresh weights of Sugar Baby,Crimson Sweet 2 and Jubilee were significantly lower than reduction percentages of Crimson Sweet 1,Black Diamond and Charleston Gray *** dry weight reduction percentages of Jubilee,Sugar Baby and Crimson Sweet 2 were lower than those of Charleston Gray No.502,Charleston Gray No.133,Black Diamond and Crimson Sweet 1 in both *** correlation existed between the virus titer in the infected cultivars and their *** general,Sugar Baby and Crimson Sweet 2 performed better than the other cultivars as they had the lowest symptom severity ratings,the lowest percentages of plant height,fresh and dry weight reductions compared to the other tested cultivars.

关键词： Plant behavior screening watermelon cultivars Watermelon mosaic virus(WMV) Saudi Arabia

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Assessment of the Cost-returns and Profitability Patterns of Tomato Production in Yamaltu-Deba Local Government Area of Gombe State,Nigeria

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Journal of Economic Science Research 2021年第3期4卷 1-9页

作者： saleh Abdullahi JIBO Mohammed ibrahim AHMAD Muhammad El-hafeez BAKO Bulus Danladi MUHAMMAD Abbas Muhammad Department of Agricultural Economics and Extension Federal University of Kashere Gombe StateNigeria

The study examined profitability of tomato production in Yamaltu-Deba Local Government Area of Gombe State.A three-stage sampling technique was used to select 96 tomato *** were collected using a structured questionnaire and were analysed using descriptive statistics,farm budget model,and t-test *** results revealed that,the mean age of tomato producers was 38.94 years,92.48%were males,71.56%were married with the majority(95.44%)had family size ranging from 1-6 persons,and had 6.55 mean years of farming experience,having an average of 0.6 ha farm size ***,the result revealed that only 8.74%that have attained tertiary *** results also revealed average variable costs constituted 88.98%and 88.84%of the average total costs of production in the dry and rainy seasons *** per hectare average net income realised were found to be₦154,444.20($398.05)and₦39,725.14($102.38)in the dry and rainy seasons ***,the returns per naira invested was₦0.67($0.00173)in dry season and₦0.18($0.00046)in rainy season(Pbuted to lack of affordable sources of *** of storage and processing facilities were among the impediments to large scale tomato production in the study ***,improvement in the existing patterns and as well as the provision of adequate essential factors of production will help expand the present scale of ***,governments and other financial institutions should do more to provide soft loans to the farmers to improve efficiency.

关键词： Profitability Assessment Tomato Production Yamaltu-Deba Gombe

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Characterization of a Watermelon mosaic virus Isolate Inducing a Severe Disease in Watermelon in Saudi Arabia

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Journal of Agricultural Science and Technology(A) 2018年第4期8卷 220-229页

作者： Adyatma Irawan Santosa ibrahim Mohamed Al-Shahwan Omer Ahmed Abdalla Mohamed Ali Al-saleh Mahmoud Ahmed Amer Plant Protection Department College of Food and Agriculture SciencesKing Saud UniversityP.O.Box 2460Riyadh11451Saudi Arabia

In one of the field visits to cucurbits-growing areas in vicinity of Riyadh city during 2013-2015,severe virus disease-like symptoms were observed on watermelon in Al-Ammariyah *** inoculation of the different plant species used in the host range study,from the collected symptomatic watermelon samples,produced mosaic symptoms on Citrullus lanatus,Cucumis sativus,Cucurbita pepo,***,*** *** and Nicotiana benthamiana,but chlorotic local lesions on Chenopodium *** symptoms were observed on the rest of the other inoculated plant *** virus was transmitted by Aphis gossypii and *** in a non-persistent *** electron microscopic examination of watermelon samples using the leaf dip method revealed only microscopic filamentous shaped virus particles measuring 750 nm in length and 12 nm in diameter in *** revealed positive results only to Watermelon mosaic virus(WMV)and negative to Zucchini yellow mosaic virus(ZYMV),Papaya ringspot virus(PRSV),Cucumber mosaic virus(CMV)and Squash mosaic virus(SqMV).Specific bands of approximately 825 bp were formed on agarose gel following electrophoresis of the reverse transcriptase-polymerase chain reaction(RT-PCR)products of each of the naturally infected ***,and artificially infected ***,***,***,and *** homology tree that was constructed from multiple sequence alignments of the detected Saudi Arabian isolate of WMV(WMV-SA)with 18 other isolates of WMV from nine different countries indicated close relationships between *** isolates from Spain and two other isolates from Iran were more closely related to the WMV-SA whereas the isolate from Poland was the least.

关键词： Watermelon ELISA nucleotide sequence RT-PCR Saudi Arabia Watermelon mosaic virus

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