| Full text | |
| Author(s): |
Santos, Elcio Ferreira
[1]
;
Mateus, Nikolas Souza
[2]
;
Rosario, Mayk Oliveira
[3]
;
Garcez, Tiago Barreto
[3]
;
Mazzafera, Paulo
[4, 5]
;
Lavres, Jose
[2]
Total Authors: 6
|
| Affiliation: | [1] Fed Inst Mato Grosso Sul, Lab Plant Nutr, BR-7575000 Nova Andradina, MS - Brazil
[2] Univ Sao Paulo, Ctr Nucl Energy Agr, Piracicaba - Brazil
[3] Univ Fed Sergipe, Campus Sertao, Nossa Senhora Da Gloria - Brazil
[4] Univ Estadual Campinas, Inst Biol, Campinas - Brazil
[5] Univ Sao Paulo, Luiz Queiroz Coll Agr, Piracicaba - Brazil
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | PHYSIOLOGIA PLANTARUM; v. 172, n. 2 OCT 2020. |
| Web of Science Citations: | 5 |
| Abstract | |
Eucalyptus are widely planted in regions with low rainfall, occasioning frequent drought stresses. To alleviate the stress-induced effects on plants growing in these environments, soil fertilization with potassium (K) may affect drought-adaptive plant mechanisms, notably on tropical soils with low K availability. This work aimed to evaluate the K dynamic nutrition in eucalyptus in response to soil-K and -water availabilities, correlating the K-nutritional status with the physiological responses of contrasting eucalyptus clones to drought tolerance. A complete randomized design was used to investigate the effects of three water regimes (well-watered, moderate water deficit, and severe water deficit) and two K soil supplies (sufficient and low K) on growth and physiological responses of two elite eucalyptus clones: ``VM01{''} (Eucalyptus urophylla x camaldulensis) and ``AEC 0144{''} (E. urophylla). Results depicted that the K-well-nourished E. urophylla x camaldulensis clone under severe water deficit maintained shoot biomass accumulation by upregulating the K-content in leaves and stems, gas exchange, water-use efficiency (WUEI), leaf water potential (psi w), and chlorophyll a fluorescence parameters, compared to E. urophylla clone. Meanwhile, E. urophylla with a severe water deficit showed a decreased of K content in leaves and stem, as well as a reduction in the accumulation of dry mass. Therefore, the K-use efficiency and the apparent electron transport rate through photosystem II were positively correlated in plants grown in low K, indicating the importance of K in maintaining leaf photochemical processes. In conclusion, management strategy should seek to enhance K-nutrition to optimize water-use efficiencies and photosynthesis. (AU) | |
| FAPESP's process: | 17/23590-9 - Remobilization of potassium in eucalyptus in response to water stress |
| Grantee: | Elcio Ferreira dos Santos |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |