Using DNA markers for characterisation of tomato resistance against root nematoden Meloidogyne incognita

CAPS (Cleaved Amplified Polymorphic Sequence) method and standard infection tests were used for the study of tomatoes (Lycopersicon esculentum L.) resistance against the root-knot nematode (Meloidogyne incognita Kofoit and White). The CAPS method was used to determine genotypic constitution of M_i gene in ten Czech and four foreign varieties of tomatoes. Similarly were verified one hundred and twenty individuals of F₂ segregated progeny of Nema variety and the same number of F₂ progeny of Petopride variety. A comparison of results of infection test with results of molecular-genetic analyse of DNA showed 100% congruence in detection resistant (susceptible respectively) genotypes. Result of ² test confirmed in the level of mathematical expectation P  (0.5, 0.7) congruence between actually obtained and theoretical segregation ratios. The CAPS method can be recommended for fast and precise determination of resistance or susceptibility of tomato plants against the root-knot nematodes. The goal of the method is the possibility of detection of genotypic constitution of M_i gene that can significantly accelerate the process of creation of new resistant varieties.

Public Watermark Detection Resistant to Sensitivity Attacks

A public watermark detection scheme using verifiable secret sharing is proposed. It removes the expensive zero-knowledge interactive proofs and replaces the traditional trusted third party with a group of proxies. Moreover, the scheme is secure against sensitivity attacks and very efficient in terms of computation cost, the number of rounds and bandwidth required in the communications.