Physiological Characterization of Young ‘Hass’ Avocado Plant Leaves Following Exposure to High Temperatures and Low Light Intensity
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 a...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-07-01
|
| Series: | Plants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2223-7747/10/8/1562 |
| _version_ | 1797522371316285440 |
|---|---|
| author | Or Shapira Simon Chernoivanov Itamar Neuberger Shay Levy Lior Rubinovich |
| author_facet | Or Shapira Simon Chernoivanov Itamar Neuberger Shay Levy Lior Rubinovich |
| author_sort | Or Shapira |
| collection | DOAJ |
| description | 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 CO<sub>2</sub> assimilation in plants subjected to 49 °C and higher temperatures. Stomatal conductance to water vapour and substomatal internal CO<sub>2</sub> 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. |
| first_indexed | 2024-03-10T08:28:30Z |
| format | Article |
| id | doaj.art-978a5cdf95254369b049293d68ad77d0 |
| institution | Directory Open Access Journal |
| issn | 2223-7747 |
| language | English |
| last_indexed | 2024-03-10T08:28:30Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Plants |
| spelling | doaj.art-978a5cdf95254369b049293d68ad77d02023-11-22T09:18:10ZengMDPI AGPlants2223-77472021-07-01108156210.3390/plants10081562Physiological Characterization of Young ‘Hass’ Avocado Plant Leaves Following Exposure to High Temperatures and Low Light IntensityOr Shapira0Simon Chernoivanov1Itamar Neuberger2Shay Levy3Lior Rubinovich4Fruit Tree Sciences, Agricultural Research Organization (ARO), The Volcani Center, HaMaccabim Road 68, P.O. Box 15159, Rishon LeZion 7528809, IsraelNorthern R&D, MIGAL–Galilee Research Institute, P.O. Box 831, Kiryat Shmona 11016, IsraelNorthern R&D, MIGAL–Galilee Research Institute, P.O. Box 831, Kiryat Shmona 11016, IsraelNorthern R&D, MIGAL–Galilee Research Institute, P.O. Box 831, Kiryat Shmona 11016, IsraelNorthern R&D, MIGAL–Galilee Research Institute, P.O. Box 831, Kiryat Shmona 11016, IsraelThe 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 CO<sub>2</sub> assimilation in plants subjected to 49 °C and higher temperatures. Stomatal conductance to water vapour and substomatal internal CO<sub>2</sub> 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.https://www.mdpi.com/2223-7747/10/8/1562heat stresscarbon assimilation<i>Persea americana</i>stomatal conductancesubtropicleaf damage |
| spellingShingle | Or Shapira Simon Chernoivanov Itamar Neuberger Shay Levy Lior Rubinovich Physiological Characterization of Young ‘Hass’ Avocado Plant Leaves Following Exposure to High Temperatures and Low Light Intensity Plants heat stress carbon assimilation <i>Persea americana</i> stomatal conductance subtropic leaf damage |
| title | Physiological Characterization of Young ‘Hass’ Avocado Plant Leaves Following Exposure to High Temperatures and Low Light Intensity |
| title_full | Physiological Characterization of Young ‘Hass’ Avocado Plant Leaves Following Exposure to High Temperatures and Low Light Intensity |
| title_fullStr | Physiological Characterization of Young ‘Hass’ Avocado Plant Leaves Following Exposure to High Temperatures and Low Light Intensity |
| title_full_unstemmed | Physiological Characterization of Young ‘Hass’ Avocado Plant Leaves Following Exposure to High Temperatures and Low Light Intensity |
| title_short | Physiological Characterization of Young ‘Hass’ Avocado Plant Leaves Following Exposure to High Temperatures and Low Light Intensity |
| title_sort | physiological characterization of young hass avocado plant leaves following exposure to high temperatures and low light intensity |
| topic | heat stress carbon assimilation <i>Persea americana</i> stomatal conductance subtropic leaf damage |
| url | https://www.mdpi.com/2223-7747/10/8/1562 |
| work_keys_str_mv | AT orshapira physiologicalcharacterizationofyounghassavocadoplantleavesfollowingexposuretohightemperaturesandlowlightintensity AT simonchernoivanov physiologicalcharacterizationofyounghassavocadoplantleavesfollowingexposuretohightemperaturesandlowlightintensity AT itamarneuberger physiologicalcharacterizationofyounghassavocadoplantleavesfollowingexposuretohightemperaturesandlowlightintensity AT shaylevy physiologicalcharacterizationofyounghassavocadoplantleavesfollowingexposuretohightemperaturesandlowlightintensity AT liorrubinovich physiologicalcharacterizationofyounghassavocadoplantleavesfollowingexposuretohightemperaturesandlowlightintensity |