7 research outputs found

    Flowering and fruit set in Japanese quince

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    The amount of flowers with defective pistils, drop of flowers after pollination, initial fruit set, drop of fruitlets and final fruit set were investigated for Japanese quince (Chaenomeles japonica). Pollen germination, pollen tube growth and fertilisation were studied at cross- and self-pollination. Embryo development was followed from fertilisation to mature fruit. The percentage of flowers with defective pistils was very high in most of the genotypes studied. This phenomenon seemed to be influenced by both environmental and genetic factors. In compatible (cross-) combinations, pollen tubes reached the base of the ovary within 2–5 days, and fertilisation took place 4–8 days after pollination. In incompatible combinations, pollen germination was slow, pollen tubes grew slowly and were often completely arrested in the style. The effective pollination period was estimated to be 3–5 days. The average initial fruit set was 21.1% (range 0–83.3%), whereas the final fruit set decreased to 10.4% (range 0–37.9%). During embryo development some deviations from normal development were observed, which may influence final fruit set

    Overview of plum breeding in Europe

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    International audienceIn Europe, the plum is one of the main fruit species, occupying an area of about 500,000 ha and ensuring production of about 3,000 million tones. The important countries regarding to plums (Serbia, Romania, Italy, Germany, Bulgaria etc.) recorded declines of production due mainly to viral diseases which destroyed the orchards and impaired the fruit quality. Therefore, these countries developed extensive breeding programs with the common objectives (productivity, fruit quality and resistance / tolerance to PPV) and specific objectives (late blooming, self-fertility, short growing period, different ripening times, spur fructification, resistance to diseases and frost). In the last 20 years 170 plum cultivars from these programs were released (Romania 38 cvs., Germany 28 cvs., Belarus 15 cvs., Serbia 14 cvs., Italy 13 cvs., Sweden 12 cvs., Bulgaria 11 cvs., Republic of Moldova 10 cvs., Latvia 9 cvs., France 6 cvs., United Kingdom 3 cvs., Czech Republic 3 cvs. and Norway 1 cv.)
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