Skip to content
Research Article Open access CC BY 4.0

The Irrigation Deficit and Its Effects on Physiology and Phenology of ‘Navelate’ Oranges Trees in Brazil

C. R. M. Oliveira, P. C. Mello-Farias, D. Agostinetto, R. R. Yamamoto, L. O. D. Marques

Journal of Experimental Agriculture International · pp. 1–9 · Published 9 Feb 2018

10.9734/JEAI/2018/38519

Abstract

Aims: The aim of this research was to study physiological responses and changes on phenology of ‘Navelate’ orange trees submitted to different water stress intensities in a greenhouse. Study Design: The experimental design was completely randomized, with three replications in each experimental unit. Values of each parameter were submitted to variance analysis, compared by Tukey’s test at 5% significance and showed as averages. Place and Duration of Study: The experiment was carried out in a greenhouse (latitude 31°52'00 "S, longitude 52°21'24" W, 13 m above sea level), during 2014 and 2015. Methodology: Stressed conditions were based on 50% and 25% of the field capacity. Gas exchange [photosynthesis (A), transpiration (E), stomatal conductance (gs), water use efficiency (WUE)] were analyzed using an infrared gas analyzer, model Li-6400 (Portable Photosynthesis System LICOR, Nebraska, USA), in addition to growth parameters. Results: Reductions on photosynthetic rate were observed (10.74% for T-50, and 20.66% for T-25, both compared to Control), indicating that CO2 assimilation rate was affected by water stress conditions. Water stress affected all gas exchange parameters of the exposed orange trees, limiting growth in diameter and height. Fruit yield decreased with the amount of water (100%> 50%> 25%). Conclusion: Navelate orange plants exposed to water deficit were tolerant in the initial phase of the treatments and during the vegetative phase, being more sensitive in the reproductive period. Plants submitted to stress with 25% of field capacity, presented limitations compared to control plants under full water availability, such as differences in height, diameter and fruit production. Water stress, at any level, reduced plant growth and fruit production. Therefore, due to variations in phenological parameters among the treatments, further studies should be performed on these variables to search for water deficit tolerant varieties and quality fruits production under these conditions.

Water stress Citrus sinensis gas exchange photosynthesis fruit production

References (7)

  1. 1 Photosynthesis under drought and salt stress: regulation mechanisms from whole plant to cell [DOI]
  2. 2 Causes of decreased photosynthetic rate and metabolic capacity in water-deficient leaf cells: a critical evaluation of mechanisms and integration of processes [DOI]
  3. 3 Effects of rising temperatures and [CO 2 ] on the physiology of tropical forest trees [DOI]
  4. 4 Photosynthetic characteristics and protective mechanisms against photooxidation during high temperature stress in two citrus species [DOI]
  5. 5 Responses of young Clementine citrus trees to water stress during different phenological periods [DOI]
  6. 6 Drought tolerance in citrus trees is enhanced by rootstock-dependent changes in root growth and carbohydrate availability [DOI]
  7. 7 Photosynthesis, Transpiration, and Water Use Efficiency of Caragana microphylla, C. intermedia, and C. korshinskii [DOI]

Cited by 1

Drought-mediated oxidative stress and its scavenging differ between citrus hybrids with medium and late fruit maturation

Jin Jia, Mingjiong Zhao, Rui Liu · Plant Stress · 2024

Related research

Article metrics

Real usage data collected on this platform.

35

Page views

0

PDF downloads

7

Outbound clicks

1

Citations

Views over time

Views by country

Approximate, from request IP at view time — not citizenship or institution. Countries with fewer than 5 views are grouped as "Other".

Traffic sources

Referring site, by host.

Views and downloads exclude known bots/crawlers. Citations combines this platform's own DOI-resolved index with each external source's own reported total — see Cited by above for individually listed citing works. Last refreshed 0 seconds ago.