Effect of mass selection in nil‐competition conditions on some traits of four cabbage populations

Abstract

Mass selection with controlled pollination for heading, resistance to early bolting, fewer frame leaves relative to head size and few cover leaves, was applied for three cycles in four Greek open‐pollinating populations (OPPs) of cabbage in nil‐competition conditions (honeycomb method). The cycle 0 OPPs with their respective cycle 3 OPPs were tested under competition conditions (growers density), in two successive years, to assess the selection response for heading, resistance to early bolting, number of cover leaves and yield. In most cases, the selection response was significant at P = 0.01 or even at P = 0.001. For example, the mean increase of yield estimated over all OPPs across 2 years was 36%, without any undesirable changes in dry matter and soluble solids contents.

Yield and quality of early cabbage (Brassica oleracea L. var. capitata) in response to within-row plant spacing

“…(1999) on tomato and Siomos (1999) on pak choi. On the other hand, our results are not conformity with those of Koutsos and Koutsika-Sotiriou (2001) who mentioned that increasing the volume of heads decreased the dry matter percent. In 2002, heads produced cca 20% more dry matter than in 2001, probably due to the lower temperature in June.…”

Effects of individual selection on agronomical and morphological traits and essential oil of a “Greek basil” population

“…This plant density (1 plant/m 2 ), which according to the vegetative size (dwarf type) of this cultivar is considered low, was applied to reduce the detrimental eVect of competition between selected plants (Bos and Caligari 1995). Several studies (Falconer 1981;Fasoulas and Fasoula 1995;Traka-Mavrona 1996;Koutsos and Koutsika-Sotiriou 2001) have shown that the selection response increases under nilcompetition conditions, where the phenotypic expression and diVerentiation are maximized. Cultivation techniques and crop protection treatments were those of organic farming and the plants were watered regularly, equally distributed to each plant by drip irrigation.…”

Mass Selection and Individual Plant Selection as Two Breeding Methods for Improving Lettuce (Lactuca sativa L.)

“…These obtained results seemed to be compatible with those of Soliman (1992) on cabbage, who illustrated that all studied characters were improved through two practiced breeding systems; i.e., recurrent selection and individual plant selection; but, with different rates for the selected characters and the used breeding program. Also, Koutsos et al (2001) recorded a desirable increment on the mean value of the yield character; which was estimated by 36%, without any undesirable changes in dry matter and soluble solids contents, as a result of applied three cycles of mass selection on cabbage. In this concern, there is a little published articles on emphasized selection of genotypes with lettuce breeding practices.…”