Effectiveness of Positive Selection in Managing Seed-Borne Potato Viruses

Okeyo, Gidraf Onduru; Sharma, Kalpana; Atieno, E.; Narla, R. D.; Miano, Douglas Watuku; Schulte-Geldermann, Elmar

doi:10.5539/jas.v10n3p71

Cited by 7 publications

(12 citation statements)

References 11 publications

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“…Good quality seed tuber has the potentiality to good field performance. The result was corroborated with the findings of Okeyo et al, (2018) and Gildemacher et al, (2007), where they stated that positive selection seed potatoes were better than normal seed tubers.…”

Section: Plant Population At Haulm Pulling Timesupporting

confidence: 85%

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Quality Assessment of the Farmer’s Produced Seed Potatoes

Huda

Hossain

Islam³

et al. 2023

Bangladesh J. Agric. Res

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The experiment was conducted at the research field and post graduate laboratory of Plant Pathology Department, Hajee Mohammad Danesh Science and Technology University, Dinajpur, during 2015 - 2016 to find out the performance of different source’s seed potatoes and select suitable methods for improvement of farm saved seed potatoes. In the experiment, farm saved seed was compared with the certified seed, positive selection’s seed, seed plot technique’s (STP) seed Potato and Truthfully level seed potato as of BARI Alu-8(Cardinal). The maximum yield (27.72 t ha-1) was recorded from positive selection’s seed, which was similar to Certified and SPT seeds. The maximum plants of farmer’s seed potatoes (≥ 8 %, 7.33 % and 4.17 %) were infected by PVY, PLRV and PMV, respectively. The seed potatoes of positive selection and seed plot technique were the best alternatives to supplement the certified seed. Bangladesh J. Agril. Res. 46(3): 343-352, September 2021

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Section: Plant Population At Haulm Pulling Timesupporting

confidence: 85%

“…The emergences of positive selection's seed potatoes were faster than others. The result was supported by the findings of Okeyo et al, (2018), where they stated that positive selection was a good management strategy to manage the seed borne viruses of potato.…”

Section: Emergence Of Seed Potatomentioning

confidence: 58%

Quality Assessment of the Farmer’s Produced Seed Potatoes

Huda

Hossain

Islam³

et al. 2023

Bangladesh J. Agric. Res

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“…The tubers harvested from these most healthy-looking plants serve as seed tubers in the following growing season. With this technique the most healthy tubers are selected and a decrease in seedborne pests and diseases can be realized (Gildemacher et al 2011;Okeyo et al 2018). Another option is using the seed plot technique, 1 which seems appropriate for farmers who have a surplus of land to reserve it for improving their seed potatoes (Kakuhenzire et al 2005;Kinyua et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Potato Yield and Yield Components as Affected by Positive Selection During Several Generations of Seed Multiplication in Southwestern Uganda

Priegnitz

Lommen

Vlugt³

et al. 2020

Potato Res.

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Potato (Solanum tuberosum L.) is an important crop in Uganda but production is low. There is not a well-functioning official seed system and farmers use potato tubers from a previous harvest as seed. This study investigated how effectively the seed technology positive selection enhanced yield and underlying crop characteristics across multiple seasons, compared to the farmers’ selection method. Positive selection is selecting healthy plants during crop growth for harvesting seed potato tubers to be planted in the next season. Farmers’ selection involves selection of seed tubers from the bulk of the ware potato harvest. Positive selection was compared to farmers’ seed selection for up to three seasons in three field trials in different locations in southwestern Uganda using seed lots from different origins. Across all experiments, seasons and seed lots, yields were higher under positive selection than under farmers’ selection. The average yield increase resulting from positive selection was 12%, but yield increases were variable, ranging from − 5.7% to + 36.9%, and in the individual experiments often not significant. These yield increases were due to higher yields per plant, and mostly higher weights per tuber, whereas the numbers of tubers per plant were not significantly different. Experimentation and yield assessment were hampered by a varying number of plants that could not be harvested because plants had to be rogued from the experimental plots because of bacterial wilt (more frequent under farmers’ selection than under positive selection), plants disappeared from the experimental field and sometimes plants did not emerge. Nevertheless, adoption of positive selection should be encouraged due to a higher production and less virus infection of seed tubers in positive selected plants, resulting in a lower degeneration rate of potato seed tubers.

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“…Positive selection in ware crops was investigated earlier during one cropping cycle with an overall yield increase of 28% , 30% (Schulte-Geldermann et al, 2012) and 37% (Siddique et al, 2017) compared to farmers' selection. Latest research in which positive selection was applied during multiple seasons (and thus for several generations of seed multiplication) confirmed the virus decrease and yield increase (Okeyo et al, 2018). The objective of this study was to assess if positive selection during multiple seasons leads to an improvement in yield compared with farmers' selection and which yield components underlie this yield increase.…”

Section: Introductionmentioning

confidence: 99%

“…The tubers harvested from these most healthy-looking plants serve as seed tubers in the following growing season. With this technique the most healthy tubers are selected, a decrease in seed-borne pests and diseases can be realized and a possible increase in yield can be achieved Okeyo et al, 2018). Another option is using the seed 2 3G seed (also called Basic Seed) refers to three generations of multiplying, starting from invitro culture and thereafter being multiplied in the greenhouse and in the field .…”

Section: Introductionmentioning

confidence: 99%

Understanding seed potato selection practices in Uganda

Priegnitz

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Potato (Solanum tuberosum L.) is an important crop for food security and cash income for smallholder farmers in Uganda. However, the national mean potato yield has been in decline to less than 5 Mg ha -1 in 2016. Low productivity of potato might be associated with poor and diverse adoption of innovative crop management practices. Smallholder farmers in Uganda commonly use seed potato tubers from the informal sector, especially by seed recycling over several generations. Therefore, seed tubers are highly degenerated with viruses and other diseases, resulting in poor yield and quality of the produce. Over one cycle of multiplication, the degeneration management by positive seed selection was found to be efficient in reducing virus diseases compared with the farmers' method of selection. The aim of this thesis was to provide novel information regarding understanding positive seed selection by investigating it across multiple cycles of multiplication with an interdisciplinary approach. To identify potato farms that are homogeneous in uptake of innovations (use of fertilizer, organic input, fungicides, pesticides, seed selection methods, seed renewal by using quality declared seed, and sole cropping), a farm typology was used and socio-economic characteristics, access to agricultural extension services, memberships of farmers' groups, yield levels of potato and economic return rates were assessed. A farm household survey (n=270) was carried out and principal component analysis and cluster analysis were used to identify types of farms differing in adoption of innovations. Four farm types were identified that demonstrated significant differences in uptake of innovation practices; these differences in uptake were associated with small but significant differences in yield and further in land ownership, availability of labourers and cash, economic return, and access to knowledge. The farm type with relatively high frequencies of using organic input, fungicide input, pesticide input, seed plot technology or positive selection, quality declared seed and sole cropping achieved highest potato productivity; the farm type with relatively frequent use of fungicide input and no use of pesticides was associated with the lowest potato yield. To assess to what extent positive selection over several seasons can reduce incidences of six different viruses in seed lots of different starting quality, multi-seasonal trials were carried out in three locations, with five seed lots from four sources and three cultivars. Detection of viruses was based on DAS-ELISA and Luminex xMAP technology. Results showed fluctuations in some viruses over seasons, with lower Potato leafroll virus (PLRV) and Potato virus X (PVX) incidences in lots from positive selection compared with lots from farmers' selection. Some seed lots were initially highly infected with Potato virus S (PVS) and Potato virus M (PVM) and showed no reduction in virus incidence through positive selection. In general, little infection with Potato virus Y (PVY) and Potato virus A (PVA) w...

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Effectiveness of Positive Selection in Managing Seed-Borne Potato Viruses

Cited by 7 publications

References 11 publications

Quality Assessment of the Farmer’s Produced Seed Potatoes

Quality Assessment of the Farmer’s Produced Seed Potatoes

Potato Yield and Yield Components as Affected by Positive Selection During Several Generations of Seed Multiplication in Southwestern Uganda

Understanding seed potato selection practices in Uganda

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