Table 1. Inheritance of resistance to fruit cracking in hybrid F1, (1994)
As shown in table 1 in the 1994 year experiment very high level penetration of the cracking was reached.
Resistant variety had about 20% plants with cracking fruits (radial cracking). In F1 resistance was dominant.
Table 2. Inheritance of resistance to fruit skin cracking in hybrid combination from crossing Richansky (P1) and
Dragotsennost 341 (P2) (1996).
The experiment of 1996 confirmed the dominance of the fruit resistance of Richansky variety in hybrid F1.
In the backcross (P2 x P1) x P2 (Table 2) a segregation on resistant and susceptible plants is near to 18:14. If
monogenic determination of inheritance is assumed then corrected number of resistant plant in the experiment
should be 18 + 16 x 1/9 = 20, and susceptible 32 - 20 = 12. The 20:12 ratio corresponds to theoretical 16:16 (X2 =
2.01; P > 0.15). In the variant of backcross (P1 x P2) x P2 analogically analyzed (with correction) ratio resistant:
susceptible plants is 16:12, that corresponds expected monogenic 14:14 (X2 = 0.57; P>0.4) The result of both
experiments prove a monogenic inheritance of the resistance to cracking of Richansky variety. The susceptibility
of Dragotsennost 341 to fruit cracking is very variable in contrast of resistance trait of Richansky. Results of
experiments coincide with early published conclusion about dominant monogenic inheritance of the resistance to
fruit cracking of Mashinny variety (Avdeyev, 1979). In both cases was in fact considered total resistance to skin
cracking, but not only to concentric cracking. In accordance with results of our experiment the dominant
monogene of resistance of Richansky variety is proposed to call Rsc (resistant to skin cracking).
Literature cited:
Avdeyev, Y.I.. 1979. Inheritance of resistance to concentric cracking. TGC Report, 29, pp. 20-21.
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