caa a22 4500 445324627 CHVBK 20180317142716.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s10681-011-0384-3 doi (NATIONALLICENCE)springer-10.1007/s10681-011-0384-3 Selection for Phytophthora field resistance in the F2 generation of organic outdoor tomatoes [Elektronische Daten] [Bernd Horneburg, Heiko Becker] Tomatoes are the most important vegetable, globally as well as in Germany. Outdoor tomato production is seriously impaired due to increasing infections with evolving late blight (Phytophthora infestans) populations. Within organic agriculture, research is being conducted to develop regionally adapted and open pollinated cultivars of outdoor tomatoes with late blight field resistance. In the present experiment, three crosses, including wild, cocktail, and beefsteak tomatoes, were selected for field resistance against late blight in F2 at one location per cross. The comparison of positive and negative selection in F3 revealed the selection of single F2 plants to be efficient in all three crosses. F2 selection has proved to be a robust and efficient tool for breeding programs. The correlated response to selection in other traits, including yield, fruit weight, days to maturity, harvest period, and plant height, depended on the cross. It was evident that selection for desired traits combined with field resistance against late blight is promising, even in wide crosses. The most undesired attribute of wild tomatoes is the formation of shoots on leaves and in inflorescences. No correlation was observed between field resistance and shoot formation, allowing the selection of genotypes with improved field resistance and yield, but without morphological disadvantages. The Author(s), 2011 Late blight nationallicence Organic breeding nationallicence Phytophthora nationallicence Resistance nationallicence Tomato nationallicence Horneburg Bernd Department of Crop Sciences, Georg-August-University of Göttingen, Von-Siebold-Str. 8, 37075, Göttingen, Germany aut Becker Heiko Department of Crop Sciences, Georg-August-University of Göttingen, Von-Siebold-Str. 8, 37075, Göttingen, Germany aut Euphytica Springer Netherlands 180/3(2011-08-01), 357-367 0014-2336 180:3<357 2011 180 10681 https://doi.org/10.1007/s10681-011-0384-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10681-011-0384-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Horneburg Bernd Department of Crop Sciences, Georg-August-University of Göttingen, Von-Siebold-Str. 8, 37075, Göttingen, Germany aut NATIONALLICENCE 700 1- Becker Heiko Department of Crop Sciences, Georg-August-University of Göttingen, Von-Siebold-Str. 8, 37075, Göttingen, Germany aut NATIONALLICENCE 773 0- Euphytica Springer Netherlands 180/3(2011-08-01), 357-367 0014-2336 180:3<357 2011 180 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer