Genetic parameters and selection in a multisite wild cherry clonal test
1998
Santi, F. | Muranty, H. | Dufour, J. | Paques, L.E.
A 7-year-old multisite clonal test with 33 clones provided the first estimations of genetic parameters and potential gains from clonal selection of wild cherry. Available traits included periodic stem height increments between years 0 and 2, and between years 2 and 7 after plantation (Ist and 2nd stem HI), breast height (BH) girth, stem straightness and pruning notes, number, angle and thinness (stem diameter/branch diameter ratio) of branches, leaf dimensions and number of nectaries, susceptibility to aphid and anthracnosis. Second stem HI, BH girth, branch angle and susceptibility to anthracnosis (or leaf spot) were the most heritable traits (0.56, 0.70, 0.57 and 0.83 at Sarrazac). The number and thinness of branches werealso heritable, but only on agricultural sites (0.66 and 0.22 at Sarrazac). Second stem HI, BH girth and number of branches were genetically well correlated with each other, and also correlated with resistance to anthracnosis. The branch angle was unrelated with such traits. An ecovalence analysis of the site x clone interaction showed that for each trait a high proportion of clones and sites were weakly interactive. We selected 8 clones after multisite index selection on 2nd stem HI, BH girth and, to a lesser degree, for thinness of branches. Two clones were eliminated for other reasons. With a weak selection intensity (1/4) we obtained a genetic gain of +11% for 2nd stem HI and +13% for BH girth. Six clones are now on the certification list.They are the first clonal varieties of wild cherry officially available in EU countries.
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