Drought tolerance in two oil palm hybrids as related to adjustments in carbon metabolism and vegetative growth
| Autor: | Reginaldo A. Festucci Buselli, Kelly C. Detmann, Fábio Miranda Leão, Fábio M. DaMatta, Hugo Alves Pinheiro, Priscilla Andrade Silva, Roberto Lisboa Cunha, Vanessa S. Cosme, Kátia C. B. Rodrigues |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Stomatal conductance Physiology Vegetative reproduction Drought tolerance Plant Science Biology Photosynthesis Elaeis guineensis 01 natural sciences Drought recovery Water deficit fungi RuBisCO Carbon metabolism food and beverages Plant physiology 04 agricultural and veterinary sciences biology.organism_classification Agronomy 040103 agronomy & agriculture biology.protein 0401 agriculture forestry and fisheries Agronomy and Crop Science 010606 plant biology & botany Elaeis oleifera |
| Zdroj: | LOCUS Repositório Institucional da UFV Universidade Federal de Viçosa (UFV) instacron:UFV |
| Popis: | Drought tolerance was examined in two oil palm hybrids (BRS Manicore and BRS C 2501) grown in large pots and subjected to long-term drought (57 days) and rehydration. Regardless of hybrids, predawn water potential (Ψ pd), net photosynthesis rates, and stomatal conductance decreased similarly upon drought imposition, but the absolute values of these variables were lower in BRS C 2501 than in BRS Manicore. Overall, drought-induced decreases in activities of key enzymes associated with carbon metabolism, including Rubisco, ADP-glucose pyrophosphorylase, and sucrose-phosphate synthase, were stronger in BRS C 2501 than in BRS Manicore. Our data suggest that synthesis of starch (and possibly sucrose) was fundamentally limited by a lower substrate availability rather than by enzymatic constraints, particularly until day 34 after suspending watering. Drought stress provoked similar decreases in biomass accumulation in either hybrid; however, BRS Manicore plants displayed higher total leaf area and root length coupled with greater relative decreases in dry matter of above-ground parts than of roots as compared to BRS C 2501, thereby leading to an increased root-to-above ground ratio in the former. Upon resuming irrigation, the slow recovery of Ψ pd preceded the recovery of stomatal conductance and photosynthesis irrespective of hybrid. BRS Manicore was better able to recover enzyme activities and carbohydrate status than BRS C 2501. In conclusion, both hybrids could tolerate (or survive) the severe drought conditions, but, overall, BRS Manicore plants were better able to adjust its physiological, morphological, and biochemical traits to cope with drought than did BRS C 2501. |
| Databáze: | OpenAIRE |
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