Bibliographic Details
| Title: |
Water Relations and Physiological Response to Water Deficit of 'Hass' Avocado Grafted on Two Rootstocks Tolerant to R. necatrix. |
| Authors: |
Moreno-Pérez, Ana1,2 (AUTHOR) ana.moreno.pe@juntadeandalucia.es, Barceló, Araceli1 (AUTHOR) araceli.barcelo@juntadeandalucia.es, Pliego, Clara1 (AUTHOR) mclara.pliego@juntadeandalucia.es, Martínez-Ferri, Elsa3 (AUTHOR) mclara.pliego@juntadeandalucia.es |
| Source: |
Agronomy. Sep2024, Vol. 14 Issue 9, p1959. 19p. |
| Subject Terms: |
*PLANT transpiration, *LEAF area, *WATER shortages, *PHOTOSYNTHETIC rates, *ROOT rots, *AVOCADO |
| Abstract: |
Avocado (Persea americana Mill.) cultivation has spread to many countries from the tropics to the Mediterranean region, where avocado crops commonly face water shortages and diseases, such as white root rot (WRR) caused by Rosellinia necatrix. The use of drought- and WRR-tolerant rootstocks represents a potential solution to these constraints. In this research, water relations and the morpho-physiological response of avocado 'Hass' grafted on two selections of R. necatrix-tolerant rootstocks (BG48 and BG181) were evaluated under well-watered (WW) and at two soil-water-availability conditions (WS, ~50% and ~25% field capacity). Under WW, scion water use was markedly affected by the rootstock, with BG48 displaying a water-spender behavior, showing higher water consumption (~20%), plant transpiration rates (~30%; Eplant) and leaf photosynthetic rates (~30%; AN) than BG181, which exhibited a water-saving strategy based upon a trade-off between leaf-biomass allocation and tight stomatal control of transpiration. This strategy did not reduce biomass, with BG181 plants being more water use efficient. Under WS, BG48 and BG181 exhibited a drought-avoidance behavior based on distinct underlying mechanisms, but increases in leaf mass area (~18–12%; LMA), and decreases in Eplant (~50–65%), plant hydraulic conductance (~44–86%; Kh) and leaf water potential (~48–73%; Ψw) were observed in both rootstocks, which aligned with water stress severity. After rewatering, photosynthetic rates fully recovered, suggesting some ability of these rootstocks to withstand water stress, enabling the 'Hass' variety to adapt to region-specific constraints. [ABSTRACT FROM AUTHOR] |
|
Copyright of Agronomy is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| Database: |
Academic Search Complete |
