Foliar Pectins and Physiology of Diploid and Autotetraploid Mango Genotypes under Water Stress
The cultivation of mango in Mediterranean-type climates is challenged by the depletion of freshwater. Polyploids are alternative genotypes with potential greater water use efficiency, but field evaluations of the anatomy and physiology of conspecific adult polyploid trees under water stress remain p...
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MDPI AG
2023-10-01
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| Series: | Plants |
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| Online Access: | https://www.mdpi.com/2223-7747/12/21/3738 |
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| author | Andrés Fonollá José I. Hormaza Juan M. Losada |
| author_facet | Andrés Fonollá José I. Hormaza Juan M. Losada |
| author_sort | Andrés Fonollá |
| collection | DOAJ |
| description | The cultivation of mango in Mediterranean-type climates is challenged by the depletion of freshwater. Polyploids are alternative genotypes with potential greater water use efficiency, but field evaluations of the anatomy and physiology of conspecific adult polyploid trees under water stress remain poorly explored. We combined field anatomical evaluations with measurements of leaf water potential (Ψ<sub>l</sub>) and stomatal conductance (G<sub>s</sub>) comparing one diploid and one autotetraploid tree per treatment with and without irrigation during dry summers (when fruits develop). Autotetraploid leaves displayed lower Ψ<sub>l</sub> and G<sub>s</sub> in both treatments, but the lack of irrigation only affected G<sub>s</sub>. Foliar cells of the adaxial epidermis and the spongy mesophyll contained linear pectin epitopes, whereas branched pectins were localized in the abaxial epidermis, the chloroplast membrane, and the sieve tube elements of the phloem. Cell and fruit organ size was larger in autotetraploid than in diploid mango trees, but the sugar content in the fruits was similar between both cytotypes. Specific cell wall hygroscopic pectins correlate with more stable Ψ<sub>l</sub> of autotetraploid leaves under soil water shortage, keeping lower G<sub>s</sub> compared with diploids. These preliminary results point to diploids as more susceptible to water deficits than tetraploids. |
| first_indexed | 2024-03-11T11:23:16Z |
| format | Article |
| id | doaj.art-4646f3a8fb084441898cc160b697a44d |
| institution | Directory Open Access Journal |
| issn | 2223-7747 |
| language | English |
| last_indexed | 2024-03-11T11:23:16Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Plants |
| spelling | doaj.art-4646f3a8fb084441898cc160b697a44d2023-11-10T15:10:21ZengMDPI AGPlants2223-77472023-10-011221373810.3390/plants12213738Foliar Pectins and Physiology of Diploid and Autotetraploid Mango Genotypes under Water StressAndrés Fonollá0José I. Hormaza1Juan M. Losada2Institute for Mediterranean and Subtropical Horticulture ‘La Mayora’ (IHSM La Mayora—CSIC—UMA), Avda. Dr. Wienberg s/n, 29750 Malaga, SpainInstitute for Mediterranean and Subtropical Horticulture ‘La Mayora’ (IHSM La Mayora—CSIC—UMA), Avda. Dr. Wienberg s/n, 29750 Malaga, SpainInstitute for Mediterranean and Subtropical Horticulture ‘La Mayora’ (IHSM La Mayora—CSIC—UMA), Avda. Dr. Wienberg s/n, 29750 Malaga, SpainThe cultivation of mango in Mediterranean-type climates is challenged by the depletion of freshwater. Polyploids are alternative genotypes with potential greater water use efficiency, but field evaluations of the anatomy and physiology of conspecific adult polyploid trees under water stress remain poorly explored. We combined field anatomical evaluations with measurements of leaf water potential (Ψ<sub>l</sub>) and stomatal conductance (G<sub>s</sub>) comparing one diploid and one autotetraploid tree per treatment with and without irrigation during dry summers (when fruits develop). Autotetraploid leaves displayed lower Ψ<sub>l</sub> and G<sub>s</sub> in both treatments, but the lack of irrigation only affected G<sub>s</sub>. Foliar cells of the adaxial epidermis and the spongy mesophyll contained linear pectin epitopes, whereas branched pectins were localized in the abaxial epidermis, the chloroplast membrane, and the sieve tube elements of the phloem. Cell and fruit organ size was larger in autotetraploid than in diploid mango trees, but the sugar content in the fruits was similar between both cytotypes. Specific cell wall hygroscopic pectins correlate with more stable Ψ<sub>l</sub> of autotetraploid leaves under soil water shortage, keeping lower G<sub>s</sub> compared with diploids. These preliminary results point to diploids as more susceptible to water deficits than tetraploids.https://www.mdpi.com/2223-7747/12/21/3738autotetraploidsdroughtleaves<i>Mangifera indica</i>pectinsstomatal conductance |
| spellingShingle | Andrés Fonollá José I. Hormaza Juan M. Losada Foliar Pectins and Physiology of Diploid and Autotetraploid Mango Genotypes under Water Stress Plants autotetraploids drought leaves <i>Mangifera indica</i> pectins stomatal conductance |
| title | Foliar Pectins and Physiology of Diploid and Autotetraploid Mango Genotypes under Water Stress |
| title_full | Foliar Pectins and Physiology of Diploid and Autotetraploid Mango Genotypes under Water Stress |
| title_fullStr | Foliar Pectins and Physiology of Diploid and Autotetraploid Mango Genotypes under Water Stress |
| title_full_unstemmed | Foliar Pectins and Physiology of Diploid and Autotetraploid Mango Genotypes under Water Stress |
| title_short | Foliar Pectins and Physiology of Diploid and Autotetraploid Mango Genotypes under Water Stress |
| title_sort | foliar pectins and physiology of diploid and autotetraploid mango genotypes under water stress |
| topic | autotetraploids drought leaves <i>Mangifera indica</i> pectins stomatal conductance |
| url | https://www.mdpi.com/2223-7747/12/21/3738 |
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