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Physiological Characterization of Young ‘Hass’ Avocado Plant Leaves Following Exposure to High Temperatures and Low Light Intensity
- Source :
- Plants, Volume 10, Issue 8, Plants, Vol 10, Iss 1562, p 1562 (2021)
- Publication Year :
- 2021
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2021.
-
Abstract
- The worldwide demand for avocados has resulted in the planting of millions of young plants each year. However, global warming, resulting in high temperatures, sensed as heat stress, may severely damage these new plantings. The objective of this study was to assess the risks of heat stress on young avocado plants. We aimed to characterize different physiological parameters of young ‘Hass’ plant leaves following exposure to high temperatures under low light (LL) intensity and to pinpoint the temperature threshold for significant heat stress damage in these plants. To this end, young potted plants were subjected to different temperature gradients in a controlled-climate chamber. Minor and severe leaf damage was apparent in plants subjected to the 51 °C and 53 °C treatments, respectively. Minor and vast reductions in optimal quantum yield efficiency of photosystem II (Fv/Fm) values were observed in plants subjected to 51 °C and 53 °C, respectively. Heat stress treatments significantly reduced CO2 assimilation in plants subjected to 49 °C and higher temperatures. Stomatal conductance to water vapour and substomatal internal CO2 concentration were less sensitive to the heat treatments. These results imply that the heat damage threshold for young avocado plants under LL conditions is between 49 °C and 51 °C, whereas at 53 °C, severe and irreversible leaf damage occurs.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Stomatal conductance
Photosystem II
Leaf damage
Hass avocado
Plant Science
01 natural sciences
Article
carbon assimilation
leaf damage
heat stress
03 medical and health sciences
Ecology, Evolution, Behavior and Systematics
Ecology
biology
Chemistry
Persea americana
fungi
Botany
Sowing
food and beverages
biology.organism_classification
Heat stress
Horticulture
Light intensity
030104 developmental biology
stomatal conductance
QK1-989
subtropic
Intensity (heat transfer)
010606 plant biology & botany
Subjects
Details
- Language :
- English
- ISSN :
- 22237747
- Database :
- OpenAIRE
- Journal :
- Plants
- Accession number :
- edsair.doi.dedup.....361715993cb1293293680e43e462cc99
- Full Text :
- https://doi.org/10.3390/plants10081562