The Effect of Temperature on Reproduction in FivePrimulaSpecies

摘要: Abstract Primula vulgarisHuds.,P. verisL.,P. frondosaJanka, and three populations ofP. farinosaL. were legitimately illegitimately pollinated, the self-fertileP. scoticaselfed cross-pollinated then subjected to uniform temperature conditions of 6, 15 or 26 °C for 4 d before gynoecia examined pollen germination tube growth, plants progressed seed set at °C, after which seeds weighed, germinated, seedlings grown on. The responses growth not always congruent, varied between species, populations, often morphs (pin thrum) in distylous species. Nevertheless, optimal tended be lower vernal species (P. vulgarisandP. veris) subarcticP. scoticathan later flowering montane However, no relationship was found response, fertility. greatest occurred legitimate pollination most cases; a impede set, except forP. scoticaand low altitude population farinosa. InP. veris, P. frondosaand high farinosa,some illegitimate but this did lead increased within-morph these self-incompatible relatively temperature. Temperature frequently affected average weight, inP. verisand two farinosathis attribute may have been influenced by number, weight few-seeded capsules tending greater than many-seeded capsules. A might mitigate disadvantageous effects fecundity resulting from interactions with scoticainteractions other, undetermined, causes. four germinated least well standard when following 6 tends support hypothesis that can affect physiology; contrast upland farinosagerminated °C. We conclude much more work is needed on reproductive efficiency, preliminary indications suggest global increase adversely quantity quality some