Stylar water potential and unilateral interspecific incompatibility in Solanaceae.

Žárský V., Pospíšilová J., Štrbáňová J., Říhová L., Tupý J.
BIOLOGIA PLANTARUM 36: 575-584, 1994

Klíčová slova: water relations, pollen culture, incompatibility,
Abstrakt: Abstract Water and osmotic potentials were measured in young and mature styles of selfcompatible (SC) and selfmcompatible (SI) species of Solanaceae. For mature flowers, the stylar water and osmotic potentials were considerably lower in SI species Nicotiana alata and Petunia hybrida than in SC species N. sylvestris and N. tabacum. Stylar water content (in % fresh mass) was also significantly lower in SI species (N. alata, P. hybrida, diploid clones of potato) than in SC species (N. acuminata, N. glauca, N. paniculata, N. syivestris, N. tabacum). For flower buds younger than 2 d before anthesis, no differences in stylar water potential between N. alata (SI) and N. tabacum (SC) were observed. During further flower bud development the stylar water potential in N. alata decreased more expressively than in N. tabacum. Pollen culture in media with various concentrations of sucrose or polyethylene glycol revealed that optimal water potential for pollen tube growth was lower in N. alata than in N. tabacum. The differences were similar as for differences in stylar water potential. The results are considered in relation to possible involvement of stylar water potential in unilateral interspecific incompatibility in Solanaceae.
DOI: 10.1007/BF02921181
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