A simple model describes development of early peaks in oomycete zoospore inoculum detected in southern UK outdoors horticultural reservoirs

• Autorzy: Pettitt T.R. , Skjoth C.A.

Warianty tytułu

PL

Model opisujący wczesne piki zoospor Oomycetes w zbiornikach wodnych szkółek ogrodniczych na południu Wielkiej Brytanii

• Języki publikacji: EN

Abstrakty

EN

The numbers of water-borne oomycete propagules in outdoor reservoirs used in horticultural nurseries within the UK are investigated in this study. Water samples were recovered from 11 different horticultural nurseries in the southern UK during Jan-May in 2 "cool" years (2010 and 2013; winter temperatures 2.0 and 0.4°C below UK Met Office 30 year winter average, respectively) and 2 "warm" years (2008 and 2012; winter temperatures 1.2 and 0.9°C above UK Met Office 30 year winter average, respectively). Samples were analyzed for total number of oomycete colony forming units (CFU), predominantly members of the families Saprolegnia-ceae and Pythiaceae, and these were combined to give monthly mean counts. The numbers of CFU were investigated with respect to prevailing climate in the region: mean monthly air temperatures calculated by using daily observations from the nearest climatological station. The investigations show that the number of CFU during spring can be explained by a linear first-order equation and a statistically significant r2 value of 0.66 with the simple relationship: [CFU] = a(T - Tb) - b, where a is the rate of inoculum development with temperature T, and b is the baseload population at temperatures below Tb. Despite the majority of oomycete CFU detected being non-phytopathogenic members of the Saprolegniaceae, total oomycete CFU counts are still of considerable value as indicators of irrigation water treatment efficacy and cleanliness of storage tanks. The presence/absence of Pythium spp. was also determined for all samples tested, and Pythium CFU were found to be present in the majority, the exceptions all being particularly cold months (January and February 2010, and January 2008). A simple scenario study (+2 deg C) suggests that abundance of water-borne oomycetes during spring could be affected by increased temperatures due to climate change.

PL

Celem badań było określenie liczby występujących w wodzie propagul lęgniowców w zbiornikach szkółek ogrodniczych w Wielkiej Brytanii. Próbki wody pozyskano w okresie od stycznia do maja, w 11 szkółkach ogrodniczych zlokalizowanych w południowej Anglii. Analizy wykonano w lat "zimnych" (2010, 2013; z temperaturą w zimie odpowiednio 2.0 i 0.4°C poniżej 30-letnich średnich wieloletnich dla miesięcy zimowych) oraz dwóch "ciepłych" (2008 i 2012; z temperaturą w zimie odpowiednio 1.2 i 0.9°C powyżej 30-letnich średnich wieloletnich dla miesięcy zimowych; wg UK Met Office). Próbki analizowano pod względem całkowitej liczby propagul tworzących kolonię (CFU), z dominacją rodziny Saprolegniaceae i Pythiaceae, które w wynikach przedstawiono jako wspólną średnią miesięczną. Liczby CFU badano w odniesieniu do panujących warunków klimatycznych w regionie m.in. średniej miesięcznej temperatury. Mimo że większość badanych rodzin lęgniowców nie jest fitopatogenna, rodziny Saprolegniaceae i Oomycete wykorzystywane są jako wskaźniki skuteczności uzdatniania wody oraz określania stopnia czystości zbiorników wykorzystywanych do nawadniania gleby w szkółkach ogrodniczych. Scenariusz wzrostu temperatury o 2°C sugeruje, że wzrost Oomycetes w wodach wiosną może wynikać ze wzrostu temperatur spowodowanych zmianami klimatycznymi.

• Wydawca: -
• Czasopismo: Acta Agrobotanica
• Rocznik: 2016
• Tom: 69
• Numer: 2
• Opis fizyczny: Article 1665 [7p.], fig.,ref.

Twórcy

autor

Pettitt T.R.

• Institute of Science and the Environment, University of Worcester, Henwick Grove, WR2 6AJ, Worcester, United Kingdom

autor

Skjoth C.A.

• Institute of Science and the Environment, University of Worcester, Henwick Grove, WR2 6AJ, Worcester, United Kingdom

Bibliografia

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Identyfikatory

DOI

10.5586/aa.1665