THE ADAPTIVE POTENTIAL OF TOMATO GENOTYPES TO LOW-TEMPERATURE STRESS BY TRAITS OF MALE GAMETOPHYTE
Миланья МАКОВЕЙ, Государственный Университет Молдовы
Rezumat
The paper presents the results of studying the effect of low temperature factor (+6°C) on the character of manifestation
of male gametophyte traits under in vitro and in vivo conditions at different time exposures (from 1 to 60 days) of pollen
storage of tomato genotypes. The dynamics of pollen quality changes and its fertilizing ability depending on storage
time was shown. Tomato genotypes (L5, L7, Solaris, Nota), with high adaptive status of their pollen to the cold factor
(+6°C), which after storage for 60 days retains the optimal percentage of viable pollen (8, 1%-12.4%), germinating
equally well both on artificial nutrient medium and pistil stigmas, providing moderate fruit set (16.7-46.8%) and good
seed formation (13-50.9%). This research approach can be effectively used to evaluate and identify genotypes with
high adaptive potential for use as donors in breeding programs, as well as when multiple pollinations with pollen of
genotypes with short flowering periods are required and especially in heterotic breeding for hybrid seed production.
Keywords: Tomato, genotype, male gametophyte, low-temperature stress, shelf life, pollen viability, pollen tube
length.
