The role of genotype and viral agents in the formation of tomato tolerance to high temperatures
DOI:
https://doi.org/10.52673/18570461.24.3-74.02Keywords:
tomato, pollen grain, temperature stress, virus, source of variation, thermoresistanceAbstract
Sunt prezentate rezultatele cercetărilor privind determinarea surselor de variație ce provoacă variabilitatea microgametofitului la descendenții plantelor reinfectate cu virusuri (virusul mozaicului tutunului/VMT sau virusul aspermiei tomatelor/VAT) pe fond de temperaturi ridicate. Tratarea termică a grăuncioarelor de polen a contribuit la modificarea caracteristicilor funcționale ale microgameților, care în majoritatea cazurilor s-a manifestat prin efecte inhibitoare. Au fost stabiliți factorii ce provoacă variația caracteristicilor genotipurilor la nivel diploid și haploid. S-a demonstrat că reacția genotipurilor analizate la tratarea termică la etapa de germinare a semințelor a fost controlată de influența majoră a genotipului și a factorului termic, fapt ce sporește gradul de identificare eficientă a formelor tolerante. Au fost evidențiate genotipuri care pe fond de temperaturi ridicate au manifestat potențial înalt de reproducere. S-a stabilit că la etapa de gametofit mascul și sporofit, descendenții plantelor infectate au depășit valorile martorului după nivelul de termorezistență, fapt ce se datorează eliminării de planta-gazdă din generația precedentă a grăuncioarelor de polen cu viabilitatea redusă. Astfel, aplicarea metodelor selecției gametice în programele de ameliorare are o importanță majoră pentru diminuarea acțiunii negative a temperaturilor ridicate atât la plantele sănătoase, cât și la cele infectate/ reinfectate cu virusuri și descendenții acestora
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