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Check the list of papers from NScTI Citrus
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2022
Miranda, Marcela T.; Espinoza-Núñez, Erick; Silva, Simone F.; Boscariol-Camargo, Raquel L.; Machado, Eduardo C.; Ribeiro, Rafael V.
Leaf PIP2.1 and PIP2.5 are down-regulated in ‘Mandarin’ lime under drought Journal Article
In: Theoretical and Experimental Plant Physiology, vol. 34, iss. 1, pp. 63-69, 2022, ISSN: 21970025.
Abstract | Links | BibTeX | Tags: ‘Swingle’ citrumelo, ‘Valencia’ sweet orange, Aquaporins, Leaf gas exchange, Rootstocks, Stomatal conductance
@article{Miranda2022,
title = {Leaf PIP2.1 and PIP2.5 are down-regulated in ‘Mandarin’ lime under drought},
author = {Marcela T. Miranda and Erick Espinoza-Núñez and Simone F. Silva and Raquel L. Boscariol-Camargo and Eduardo C. Machado and Rafael V. Ribeiro},
url = {https://link.springer.com/article/10.1007/s40626-021-00229-7},
doi = {10.1007/S40626-021-00229-7/METRICS},
issn = {21970025},
year = {2022},
date = {2022-01-01},
journal = {Theoretical and Experimental Plant Physiology},
volume = {34},
issue = {1},
pages = {63-69},
publisher = {Springer Science and Business Media Deutschland GmbH},
abstract = {Aquaporins are water channel proteins that facilitate water transport through the transcellular pathway, a route with high resistance due to lipid bilayer membranes. Aquaporins occur as multiple isoforms and plasma membrane aquaporins (PIPs) are known to modulate plant responses to abiotic stress such as drought. Previous studies have reported changes in PIPs expression in roots of Citrus plants under abiotic stresses; however, such changes are limited to grafted citrus trees with plant responses to environmental stresses being driven by two species. Therefore, the ability of a given Citrus species—i.e., non-grafted Citrus saplings—in modulating aquaporin expression under water deficit remains unknown. This study aimed to evaluate how water deficit changes aquaporin expression (PIP1; PIP2.1; and PIP2.5) and leaf gas exchange of saplings of three Citrus species: ‘Mandarin’ lime, ‘Swingle’ citrumelo and ‘Valencia’ sweet orange. Root aquaporin expression did not vary under water deficit or among species, but the predawn leaf water potential of ‘Valencia’ sweet orange was reduced due to water deficit. Decreases in stomatal conductance were found in all species under water deficit, which were associated with reduced PIP2.1 expression in leaves. However, ‘Mandarin’ lime exhibited the largest reduction in stomatal conductance and significant gene repression of not only PIP2.1 but also PIP2.5 in leaves under water deficit. ‘Mandarin’ lime is known as a drought tolerant rootstock widely used in citriculture and our data suggest that this rootstock presents a fast-response mechanism against drought based on stomatal closure associated with downregulation of PIP2.1 and PIP2.5 in leaves.},
keywords = {‘Swingle’ citrumelo, ‘Valencia’ sweet orange, Aquaporins, Leaf gas exchange, Rootstocks, Stomatal conductance},
pubstate = {published},
tppubtype = {article}
}
Aquaporins are water channel proteins that facilitate water transport through the transcellular pathway, a route with high resistance due to lipid bilayer membranes. Aquaporins occur as multiple isoforms and plasma membrane aquaporins (PIPs) are known to modulate plant responses to abiotic stress such as drought. Previous studies have reported changes in PIPs expression in roots of Citrus plants under abiotic stresses; however, such changes are limited to grafted citrus trees with plant responses to environmental stresses being driven by two species. Therefore, the ability of a given Citrus species—i.e., non-grafted Citrus saplings—in modulating aquaporin expression under water deficit remains unknown. This study aimed to evaluate how water deficit changes aquaporin expression (PIP1; PIP2.1; and PIP2.5) and leaf gas exchange of saplings of three Citrus species: ‘Mandarin’ lime, ‘Swingle’ citrumelo and ‘Valencia’ sweet orange. Root aquaporin expression did not vary under water deficit or among species, but the predawn leaf water potential of ‘Valencia’ sweet orange was reduced due to water deficit. Decreases in stomatal conductance were found in all species under water deficit, which were associated with reduced PIP2.1 expression in leaves. However, ‘Mandarin’ lime exhibited the largest reduction in stomatal conductance and significant gene repression of not only PIP2.1 but also PIP2.5 in leaves under water deficit. ‘Mandarin’ lime is known as a drought tolerant rootstock widely used in citriculture and our data suggest that this rootstock presents a fast-response mechanism against drought based on stomatal closure associated with downregulation of PIP2.1 and PIP2.5 in leaves.
2020
Morelli, Marília; Takayassu, Felipe Hirayuki; Pacheco, Camilla Andrade; Conceição, Patrícia Marluci; Filho, Helvécio Della Coletta; Azevedo, Fernando Alves
Impact of HLB on the physiological quality of citrus rootstock seeds and non-vertical ‘Candidatus Liberibacter asiaticus’ transmission Journal Article
In: Tropical Plant Pathology, vol. 45, iss. 6, pp. 620-625, 2020, ISSN: 19832052.
Abstract | Links | BibTeX | Tags: ‘Rangpur’ lime, ‘Swingle’ citrumelo, bacterium, Citrus, Greening, Seeds
@article{Morelli2020,
title = {Impact of HLB on the physiological quality of citrus rootstock seeds and non-vertical ‘Candidatus Liberibacter asiaticus’ transmission},
author = {Marília Morelli and Felipe Hirayuki Takayassu and Camilla Andrade Pacheco and Patrícia Marluci Conceição and Helvécio Della Coletta Filho and Fernando Alves Azevedo},
url = {https://link.springer.com/article/10.1007/s40858-020-00371-8},
doi = {10.1007/S40858-020-00371-8/METRICS},
issn = {19832052},
year = {2020},
date = {2020-01-01},
journal = {Tropical Plant Pathology},
volume = {45},
issue = {6},
pages = {620-625},
publisher = {Springer Science and Business Media Deutschland GmbH},
abstract = {Huanglongbing (HLB) is the main disease of citriculture worldwide, being mainly caused by the bacterium known as ‘Candidatus Liberibacter asiaticus’ (CLas), limited to the phloem and naturally transmitted by vector insects known as psyllids. For the production of citrus seedlings, it is necessary to use rootstocks that are propagated by seeds from fruits produced by mother plants grown in field, however being submitted to natural HLB transmission. Although there is no evidence of CLas transmission from seeds to seedlings, little is known about the effects of this bacterium on the physiological quality of seeds obtained from CLas-infected plants. Therefore, the aim of this work was to evaluate the physiological quality of seeds from ‘Rangpur’ lime and ‘Swingle’ citrumelo rootstocks, from CLas-infected plants, with symptomatic and asymptomatic branches. The parameters evaluated, in addition to fruit development in mother plants, were germination rate, tetrazolium test, electrical conductivity, seedling emergence in greenhouse, and vegetative development and molecular analysis via qPCR for the detection of bacteria (leaf petiole, fruit peduncles, roots, seed coats, and seed endosperm). The presence of CLas in plants of both rootstocks has negative impact on fruit development, as well as on the number of normal seeds. In addition, there is reduced germination and seed emergence. Although CLas was detected in different tissues (leaf petiole, fruit peduncles and seed coat, and seed embryo), no vertical bacteria transmission was detected. Results have shown that seeds from CLas-infected branches have impaired physiological quality, but without bacterial transmission from seeds to seedlings.},
keywords = {‘Rangpur’ lime, ‘Swingle’ citrumelo, bacterium, Citrus, Greening, Seeds},
pubstate = {published},
tppubtype = {article}
}
Huanglongbing (HLB) is the main disease of citriculture worldwide, being mainly caused by the bacterium known as ‘Candidatus Liberibacter asiaticus’ (CLas), limited to the phloem and naturally transmitted by vector insects known as psyllids. For the production of citrus seedlings, it is necessary to use rootstocks that are propagated by seeds from fruits produced by mother plants grown in field, however being submitted to natural HLB transmission. Although there is no evidence of CLas transmission from seeds to seedlings, little is known about the effects of this bacterium on the physiological quality of seeds obtained from CLas-infected plants. Therefore, the aim of this work was to evaluate the physiological quality of seeds from ‘Rangpur’ lime and ‘Swingle’ citrumelo rootstocks, from CLas-infected plants, with symptomatic and asymptomatic branches. The parameters evaluated, in addition to fruit development in mother plants, were germination rate, tetrazolium test, electrical conductivity, seedling emergence in greenhouse, and vegetative development and molecular analysis via qPCR for the detection of bacteria (leaf petiole, fruit peduncles, roots, seed coats, and seed endosperm). The presence of CLas in plants of both rootstocks has negative impact on fruit development, as well as on the number of normal seeds. In addition, there is reduced germination and seed emergence. Although CLas was detected in different tissues (leaf petiole, fruit peduncles and seed coat, and seed embryo), no vertical bacteria transmission was detected. Results have shown that seeds from CLas-infected branches have impaired physiological quality, but without bacterial transmission from seeds to seedlings.