Growth and yield performance of different generations of seed potato as affected by PVY and PLRV

Abstract

Performance of potato seed tubers of first, second, third, fourth, and fifth generations were evaluated against PVY and PLRV. Potato plants grown from first generation seed tubers were free from PVY infection. Incidence of the virus was the minimal at second generation, which increased afterwards steadily by third, fourth, and fifth generations. Incidence of PLRV was minimal at first generation. It increased gradually with the advancement of generation seed tubers showing the highest incidence at fifth generation. The highest plant growth and tuber yield were recorded at second generation, which was followed by third, fourth, and fifth generations. The highest reduction in plant height, tuber number, and tuber yield were recorded in 5th generation due to infection of PVY and PLRV. Keywords: Generation evaluation; PVY; PLRV; growth; yield; potato DOI: 10.3329/bjar.v35i1.5865Bangladesh J. Agril. Res. 35(1) : 37-50, March 2010

Effectiveness of Positive Selection in Managing Seed-Borne Potato Viruses

“…The analysis also revealed that most of the correlation coefficients were not significant, and this might be an indication that reduction in number of tubers per hill and yield might also have occurred due to other abiotic and biotic factors such as water stress during crop growth and insect pest infestation (Pereira & Nova, 2008;Batool et al, 2011). Rahman et al (2010), and Islam et al (2014) also reported a negative correlation between number of tubers per hill and yield in their study. The study also revealed that yield (t/ha) increases with increasing tuber number per hill.…”

“…This study also revealed a decline in number of tubers per hill and yield in both RSS and PS sub-plots of FG4 in comparison to FG3. The decline in number of tubers per hill and yields observed in FG4 can be attributed to increase in virus incidence recorded in FG4 (Rahman et al, 2010;Ali et al, 2013;Islam et al, 2014). Salazar (1996) reported that yield losses in potato fields increased with increasing symptom appearance on the foliage which was also observed in this study.…”

“…Use of virus infected seed potato tubers has resulted into high yield losses up to 68%, which mostly go unrealized in production fields free from bacterial and fungal diseases because their field diagnosis is difficult and or poorly understood by most farmers (Kabira et al, 2006). Yield losses following virus infection is variety specific, and potato varieties react differently to the type of virus, its growth stage and infection type (Ali et al, 2013;Rahman et al, 2010). Six potato viruses namely Potato Leaf Roll Virus (PLRV), Potato Virus A (PVA), Potato Virus M (PVM), Potato Virus S (PVS), Potato Virus X (PVX), and Potato Virus Y (PVY) and four aphid vector species namely Macrosiphum euphorbiae, Aphis gossypii, Myzus persicae, and Aphis fabae are known to affect potato production in Kenya causing low yields (Were et al, 2013).…”

Potato virus Y (PVY) and potato virus X (PVX) resistance breeding in Kenya: applicability of conventional approaches

“…Using varieties with such resistance in addition to resistance to other impotent viruses would enable seed producers and farmers grow their crop for more generations without lowering seed quality and ware potato yields (Rahman et al, 2010). (Upeksha et al, 2012).…”

“…Sources of virus resistance used for breeding for PVY and PVX resistance: Recognition of potato viruses as a serious problem in potato production in 1930's triggered a lot of research on the characterization of numerous virus resistance genes and phenotypes in Solanum species (Salaman, 1938;Cockerham, 1970;Solomon and Barker, 2001;Rahman et al, 2010). Before recognition of this virus problem, selection for virus resistance within the tuberosum gene pool was done by selecting cultivars that were able to withstand virus degeneration better than others (Cockerham, 1943).…”