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Floral biology of montane plants and its change with elevation and phenology, effect of pollination stochasticity and other factors on the number of ovules
Nekola, Matyáš ; Sklenář, Petr (advisor) ; Koupilová, Klára (referee)
The number of ovules that each plant produces reflects its ability to adapt. There are several factors that affect ovule production. An important factor is elevation. With the rising elevation also rises the severeness of stochasticity and pollen limitation. Additionally, at the begining of the vegetational season the pollination should be more stochastic and limited. One of the strategies that plants use is called Bet-hedging strategy. Main part of this strategy is the overproduction of the ovules in the ovaries. This above average number of ovules will be used in the case that the flower receives higher than average pollen load. In the end, the plant can compensate for the occasions when the received pollen load is lower. Alpine environment is proposed to have higher pollination stochasticity and pollen limitation. Hence this work is built on the hypothesis that number of ovules will increase with elevation and will be higher at the beginning of the vegetational season in accordance with Bet-hedging strategy. In my diploma thesis I quantified ovule number in 9 species namely Arabidopsis halleri, Calluna vulgaris, Campanula rotundifolia, Melampyrum pratense, Melampyrum sylvaticum, Silene dioica, Silene vulgaris, Trientalis europaea, Vaccinium vitis-idaea, Veronica chamaedrys and Viola lutea subsp....
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Floral biology of montane plants and its change with elevation and phenology, effect of pollination stochasticity and other factors on the number of ovules
Nekola, Matyáš ; Sklenář, Petr (advisor) ; Koupilová, Klára (referee)
Pollination is a highly stochastic process. When also combined with pollen limitation, it could have notable effect on the number of seeds and therefore the plant fitness. Plants in order to compensate for the high pollination stochasticity use Bet-hedging strategy (Burd et al., 2009). Main part of this strategy is the overproduction of the ovules in the ovaries. This above average number of ovules will be used in the case that the flower receives higher than average pollen load. In the end, the plant can compensate for the occasions when the received pollen load is lower. Alpine environment is proposed to have higher pollination stochasticity and pollen limitation. With the rising elevation also rises the severeness of stochasticity and pollen limitation. Additionally, at the beginning of the vegetational season the pollination should be more stochastic and limited. Hence this work is built on the hypothesis that that number of ovules will increase with elevation and will be higher at the beginning of the vegetational season in accordance with Bet-hedging strategy. The increase of the ovule numbers with the rising elevation wasn't confirmed. On the other hand, there were documented connections between declining number of ovules throughout the season and 1) distribution of ovules among...
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