Water stress signaling and hydraulic traits in three congeneric citrus species under water deficit

Miranda, Marcela T.; Espinoza-Núñez, Erick; Silva, Simone F.; Pereira, Luciano; Hayashi, Adriana Hissae; Boscariol-Camargo, Raquel L.; Carvalho, Sérgio Alves de; Machado, Eduardo Caruso; Ribeiro, Rafael Vasconcelos

doi:10.1016/j.plantsci.2022.111255

Cited by 13 publications

(10 citation statements)

References 77 publications

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“…Such contrasting results are likely caused by the grafting technique. Nevertheless, the air injection method used by Miranda et al (2022b) could be prone to an effervescence artefact (Yin & Cai, 2018) and/or an openvessel artefact in long-vessel species (Ennajeh et al, 2011), which is the case for Citrus plants-with a mean vessel length of ca. 23 cm (Supporting Information S1: Figure S4 and Table 1).…”

Section: Discussionmentioning

confidence: 99%

Rootstocks affect the vulnerability to embolism and pit membrane thickness in Citrus scions

Miranda,

Pires,

Pereira

et al. 2024

Plant Cell & Environment

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Embolism resistance of xylem tissue varies among species and is an important trait related to drought resistance, with anatomical attributes like pit membrane thickness playing an important role in avoiding embolism spread. Grafted Citrus trees are commonly grown in orchards, with the rootstock being able to affect the drought resistance of the whole plant. Here, we evaluated how rootstocks affect the vulnerability to embolism resistance of the scion using several rootstock/scion combinations. Scions of ‘Tahiti’ acid lime, ‘Hamlin’, ‘Pera’ and ‘Valencia’ oranges grafted on a ‘Rangpur’ lime rootstock exhibit similar vulnerability to embolism. In field‐grown trees, measurements of leaf water potential did not suggest significant embolism formation during the dry season, while stomata of Citrus trees presented an isohydric response to declining water availability. When ‘Valencia’ orange scions were grafted on ‘Rangpur’ lime, ‘IAC 1710’ citrandarin, ‘Sunki Tropical’ mandarin or ‘Swingle’ citrumelo rootstocks, variation in intervessel pit membrane thickness of the scion was found. The ‘Rangpur’ lime rootstock, which is known for its drought resistance, induced thicker pit membranes in the scion, resulting in higher embolism resistance than the other rootstocks. Similarly, the rootstock ‘IAC 1710’ citrandarin generated increased embolism resistance of the scion, which is highly relevant for citriculture.

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Section: Discussionmentioning

confidence: 99%

Rootstocks affect the vulnerability to embolism and pit membrane thickness in Citrus scions

Miranda,

Pires,

Pereira

et al. 2024

Plant Cell & Environment

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“…It represents the amount of water flowing through a unit of root surface area (or length) per unit pressure gradient per unit of time [ 91 ]. Several studies have shown that soil characteristics and water quality have an extreme effect on root hydraulic conductivity, and salt stress greatly reduces it [ 20 , 31 , 36 , 77 , 92 , 93 , 94 , 95 , 96 ]. In this experiment, the results showed that PEG stress, NaCl stress, and combined PEG and NaCl stress significantly reduced the theoretical hydraulic conductivity and the single-plant root hydraulic conductivity of the three wheat varieties, which was in agreement with the results of previous studies ( Figure 5 ).…”

Section: Discussionmentioning

confidence: 99%

“…There have been several reports on the influence of environmental factors, such as soil mechanical resistance, soil bulk density, drought, salinity, and soil ventilation—all of which will affect root hydraulic conductivity—on root water absorption [ 20 , 27 , 28 ]. Previous results showed that drought stress reduced the root hydraulic conductivity of cedar [ 29 ], eucalyptus [ 30 ], citrus [ 31 ], tomato [ 32 ], rice [ 33 , 34 ], and corn [ 35 ]. Salt stress can also reduce the root hydraulic conductivity of saltbush [ 36 ], rice [ 26 ], Beta vulgaris [ 37 ], tomato [ 1 ], and soybean.…”

Section: Introductionmentioning

confidence: 99%

Effects of Single and Combined Drought and Salinity Stress on the Root Morphological Characteristics and Root Hydraulic Conductivity of Different Winter Wheat Varieties

Hamani

et al. 2023

Plants

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Water shortages and crop responses to drought and salt stress are related to the efficient use of water resources and are closely related to food security. In addition, PEG or NaCl stress alone affect the root hydraulic conductivity (Lpr). However, the effects of combined PEG and NaCl stress on Lpr and the differences among wheat varieties are unknown. We investigated the effects of combined PEG and NaCl stress on the root parameters, nitrogen (N) and carbon content, antioxidant enzymes, osmotic adjustment, changes in sodium and potassium, and root hydraulic conductivity of Yannong 1212, Heng 4399, and Xinmai 19. PEG and NaCl stress appreciably decreased the root length (RL), root surface area (RS), root volume (RV), K+ and N content in shoots and roots, and Lpr of the three wheat varieties, while the antioxidant enzyme activity, malondialdehyde (MDA), osmotic adjustment, nonstructural carbon and Na+ content in shoots and roots, etc., remarkably remained increased. Furthermore, the root hydraulic conductivity had the greatest positive association with traits such as RL, RS, and N and K+ content in the shoots of the three wheat varieties. Moreover, the RL/RS directly and actively determined the Lpr, and it had an extremely positive effect on the N content in the shoots of wheat seedlings. Collectively, most of the root characteristics in the wheat seedlings decreased under stress conditions, resulting in a reduction in Lpr. As a result, the ability to transport nutrients—especially N—from the roots to the shoots was affected. Therefore, our study provides a novel insight into the physiological mechanisms of Lpr.

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“…Upon rehydration, WUE was significantly higher in ‘IACSP94-2094’ compared to its irrigated control. The improvement of WUE in ‘IACSP94-2094’ may be explained by the apparent slow recovery of stomatal conductance ( Figure 1E , p- value = 0.063), as severe drought stress could accumulate high concentrations of ABA that might take longer to be degraded ( Miranda et al., 2022 ). Together, these results show the ability of the tolerant genotype to maintain CO 2 assimilation with reduced transpiration – improved WUE – under unfavorable conditions, a strategy that can save water and benefit field-grown plants in the long term.…”

Section: Discussionmentioning

confidence: 99%

Drought-triggered leaf transcriptional responses disclose key molecular pathways underlying leaf water use efficiency in sugarcane (Saccharum spp.)

et al. 2023

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Drought is a major constraint to sugarcane (Saccharum spp.) production and improving the water use efficiency (WUE) is a critical trait for the sustainability of this bioenergy crop. The molecular mechanism underlying WUE remains underexplored in sugarcane. Here, we investigated the drought-triggered physiological and transcriptional responses of two sugarcane cultivars contrasting for drought tolerance, ‘IACSP97-7065’ (sensitive) and ‘IACSP94-2094’ (tolerant). After 21 days without irrigation (DWI), only ‘IACSP94-2094’ exhibited superior WUE and instantaneous carboxylation efficiency, with the net CO2 assimilation being less impacted when compared with ‘IACSP97-7065’. RNA-seq of sugarcane leaves at 21 DWI revealed a total of 1,585 differentially expressed genes (DEGs) for both genotypes, among which ‘IACSP94-2094’ showed 617 (38.9%) exclusive transcripts (212 up- and 405 down-regulated). Functional enrichment analyses of these unique DEGs revealed several relevant biological processes, such as photosynthesis, transcription factors, signal transduction, solute transport, and redox homeostasis. The better drought-responsiveness of ‘IACSP94-2094’ suggested signaling cascades that foster transcriptional regulation of genes implicated in the Calvin cycle and transport of water and carbon dioxide, which are expected to support the high WUE and carboxylation efficiency observed for this genotype under water deficit. Moreover, the robust antioxidant system of the drought-tolerant genotype might serve as a molecular shield against the drought-associated overproduction of reactive oxygen species. This study provides relevant data that may be used to develop novel strategies for sugarcane breeding programs and to understand the genetic basis of drought tolerance and WUE improvement of sugarcane.

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Water stress signaling and hydraulic traits in three congeneric citrus species under water deficit

Cited by 13 publications

References 77 publications

Rootstocks affect the vulnerability to embolism and pit membrane thickness in Citrus scions

Rootstocks affect the vulnerability to embolism and pit membrane thickness in Citrus scions

Effects of Single and Combined Drought and Salinity Stress on the Root Morphological Characteristics and Root Hydraulic Conductivity of Different Winter Wheat Varieties

Drought-triggered leaf transcriptional responses disclose key molecular pathways underlying leaf water use efficiency in sugarcane (Saccharum spp.)

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