Changes in low-temperature phase transitions of dormant buds of fruit plants after their dehydration

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00027006%3A_____%2F23%3A10176648" target="_blank" >RIV/00027006:_____/23:10176648 - isvavai.cz</a>

Result on the web

—

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

Changes in low-temperature phase transitions of dormant buds of fruit plants after their dehydration

Original language description

Development of crystallization processes and their localization in plant tissues are decisive factors in survival under the influence of low temperatures and they limit the distribution area of plant species (Yu and Lee, 2020). This study aimed at studying the low-temperature phase transitions in fruit plant one-year-old twigs and their changes during dehydration. Thermal analysis of Prunus armeniaca L., Rubus idaeus L. and Vitis vinifera L. tissues was performed using differential scanning calorimeter (Zámečník et al.). It was revealed that crystallization events in the tissues of studied plants did not occur simultaneously. During cooling of dormant buds, an intense main peak of water crystallization was first recorded at temperatures from -5 to -18 oC, depending on species and varieties, and a small peak of crystallization of supercooled water was recorded at lower temperatures (-37 - -41 oC). During heating, only one intense peak of ice melting was recorded in all plant samples. In woody stem tissues, the crystallization peak of supercooled water had significantly higher enthalpy than in buds. Crystallization peaks close to temperature of homogeneous ice nucleation in woody tissues (-38 oC) may be due to xylem parenchyma cells not contain nuclei for heterogeneous crystallization and freeze as individual units or small groups of cells (Ashworth and Wisniewski, 1991). A significantly smaller amount of crystallized water and a lower crystallization temperature were found in Rubus tissues than in Prunus tissues. The onset temperature and enthalpy of crystallization decreased with decreasing water content. During cooling, a superposition of several low-intensity peaks was recorded, indicating the absence of a crystallization front, and crystallization occurred separately in different buds and wood compartments. Thus, the process of crystallization in plant tissues is complicated due to the properties of cell wall, which promotes supercooling and prevents the spread of ice from neighbouring cells.

Czech name

—

Czech description

—

Type

O - Miscellaneous

CEP classification

—

OECD FORD branch

40106 - Agronomy, plant breeding and plant protection; (Agricultural biotechnology to be 4.4)

Project

—

Continuities

R - Projekt Ramcoveho programu EK

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů