Browsing by Subject "electrolyte leakage"

Now showing 1 - 3 of 3
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    Damage measurements and reproductive outcomes following phenologic delay and floral freezing of a population of Prunus pumila plants
    (2024-06-06) Lake Diver, Danielle A; Savage, Jessica A; jsavage@d.umn.edu; Savage, Jessica; Savage research team
    There are advantages flowering early in the spring, which include greater pollinator fidelity and longer fruit maturation time. But plant phenology has advanced in recent years making many plants vulnerable to freezing damage from late frosts. To determine the costs and benefits of flowering early in the spring, we exposed Prunus pumila plants to two freezing treatments and a delayed flowering treatment in subsequent years. Data were collected on ovary swelling, fruit production and pollinator visitation on hand-and open-pollinated plants in all treatments. We also measured tissue damage after freeze events. Our results suggest that flowering time and temperature affect reproductive success, with fewer fruits produced after hard freezes. The same was not true for light freezes, which had minimal impact on reproduction. Freezing damage to plants after a hard freeze did affect the number of Dipteran pollinators but not the overall pollinator visitation rate. Despite the clear impact of freezing temperatures on plant reproduction, there were also advantages for flowering early as reproductive output decreased during with delayed flowering. Our findings suggest that Prunus pumila will retain the ability to attract pollinators and produce viable seeds if exposed to false spring conditions that involve a light freeze, but hard freezes may reduce yield by an order of magnitude. Although the advantages to flowering early may outweigh the risk of freezing damage under current conditions, it is possible that flower viability may be constrained under continued climate warming.
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    Data on tissue injury and conductivity of flowers at different temperatures along with method validation
    (2023-11-16) Savage, Jessica A.; Olson, Mady; Hudzinski, Sydney; jsavage@d.umn.edu; Savage, Jessica A.; Savage research team
    These data are for a paper on how to use the electrolyte leakage method to measure floral freezing tolerance. The files include tests of different sample preparation methods and temperate response curves for a handful of species.
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    Floral freezing tolerance of Minnesotan woody and semi-woody plants
    (2024-02-29) Savage, Jessica A.; Vandenheuvel, Britton; Fakhreddine, Qadry; jsavage@d.umn.edu; Savage, Jessica A.; Savage research team
    Data collected for a study on floral freezing tolerance of native trees and shrubs. The goal of the project was to determine if native flowers are vulnerable to freezing temperatures and how their vulnerability to freezing temperatures relates to their flowering time.