Search results for "metsäkurjenpolvi"
showing 4 items of 4 documents
Sexes in gynodioeciousGeranium sylvaticumdo not differ in their isotopic signature or photosynthetic capacity
2017
• In gynodioecious plants, females are expected to produce more or better seeds than hermaphrodites in order to be maintained within the same population. Even though rarely measured, higher seed production can be achieved through differences in physiology. • In this work, we measured sexual dimorphism in several physiological traits in the gynodioecious plant Geranium sylvaticum. Photosynthetic rate, stomatal conductivity, transpiration rate, water use efficiency and isotopic signatures were measured in plants growing in two habitats differing in light availability. • Females have been reported to produce more seeds than hermaphrodites. However, we did not observe any significant difference…
Absence of Sex Differential Plasticity to Light Availability during Seed Maturation in Geranium sylvaticum
2015
Sex-differential plasticity (SDP) hypothesis suggests that since hermaphrodites gain fitness through both pollen and seed production they may have evolved a higher degree of plasticity in their reproductive strategy compared to females which achieve fitness only through seed production. SDP may explain the difference in seed production observed between sexes in gynodioecious species in response to resource (nutrients or water) availability. In harsh environments, hermaphrodites decrease seed production whereas females keep it relatively similar regardless of the environmental conditions. Light availability can be also a limiting resource and thus could theoretically affect differently femal…
Lisääntymissysteemin vaikutus metsäkurjenpolven (Geranium sylvaticum) patogeeniresistenssiin
2016
Lisääntymissysteemiltään gynodieekkisissa kasvipopulaatioissa on tavallisesti sukupuoleltaan kahdenlaisia yksilöitä, puhtaasti emikukkaisia kasveja sekä kaksineuvoisia kukkia tuottavia kasveja. Nämä eri sukupuolet eroavat toisistaan geneettisten, morfologisten ja fysiologisten piirteiden suhteen. Lisääntymissysteemi vaikuttaa myös yksilöiden resurssiallokointitapaan sekä siihen miten ja missä suhteessa gynodieekkisten populaatioiden yksilöt osallistuvat geenien siirtämiseen jälkeläisilleen. Emikasvit osallistuvat jälkeläistuotantoon siemenaiheita tuottamalla ja kaksineuvoiset kasvit siemenaiheita sekä siitepölyä tuottamalla. Edellä mainitut sukupuolisidonnaisten erojen vaikutukset voivat he…
Sexes in gynodioecious Geranium sylvaticum do not differ in their isotopic signature or photosynthetic capacity
2017
In gynodioecious plants, females are expected to produce more or better seeds than hermaphrodites in order to be maintained within the same population. Even though rarely measured, higher seed production can be achieved through differences in physiology. In this work, we measured sexual dimorphism in several physiological traits in the gynodioecious plant Geranium sylvaticum. Photosynthetic rate, stomatal conductance, transpiration rate, WUE and isotopic signatures were measured in plants growing in two habitats differing in light availability. Females have been reported to produce more seeds than hermaphrodites. However, we did not observe any significant difference in seed output between …