| chloride absorption in salt-sensitive carrizo citrange and salt-tolerant cleopatra mandarin citrus rootstocks is linked to water use. | in this work, seedlings of two citrus rootstocks, the salt-tolerant cleopatra mandarin (citrus reshni hort. ex tan.) and the salt-sensitive carrizo citrange (citrus sinensis [l.] osb. x poncirus trifoliata [l.] raf.) were used to study the relationship between chloride and water uptake. the results indicated that net chloride uptake rates in both genotypes were alike and decreased linearly with the time of salinity exposure, although they were more rapidly reduced in the tolerant genotype. in ea ... | 2003 | 12554725 |
| nitrate improves growth in salt-stressed citrus seedlings through effects on photosynthetic activity and chloride accumulation. | we analyzed the effects of nitrate availability on growth of navelina (citrus sinensis (l.) osbeck) scions grafted on three citrus rootstocks differing in salt tolerance: carrizo citrange (citrus sinensis (l.) osbeck x poncirus trifoliata (l.) raf.), citrus macrophylla wester and cleopatra mandarin (citrus reshni hort. ex tanaka). salt stress reduced total plant biomass by 27-38%, whereas potassium nitrate supplementation partially counteracted this effect by increasing dry matter and new leaf a ... | 2004 | 15234900 |
| aluminum-induced decrease in co2 assimilation in citrus seedlings is unaccompanied by decreased activities of key enzymes involved in co2 assimilation. | 'cleopatra' tangerine (citrus reshni hort. ex tanaka) seedlings were irrigated daily for 8 weeks with 1/4 strength hoagland's nutrient solution containing 0 (control) or 2 mm aluminum (al). leaves from al-treated plants had decreased co2 assimilation and stomatal conductance, but increased intercellular co2 concentrations compared with control leaves. on a leaf area basis, 2 mm al increased activities of key enzymes in the calvin cycle, including ribulose-1,5-bisphosphate carboxylase/oxygenase ( ... | 2005 | 15631980 |
| antioxidant enzymatic activity is linked to waterlogging stress tolerance in citrus. | soil flooding constitutes a seasonal factor that negatively affects plant performance and crop yields. in this work, the relationship between oxidative damage and flooding sensitivity was addressed in three citrus genotypes with different abilities to tolerate waterlogging. we examined leaf visible damage, oxidative damage in terms of malondialdehyde (mda) concentration, leaf proline concentration, leaf and root ascorbate and glutathione contents and the antioxidant enzyme activities superoxide ... | 2008 | 18333999 |
| effects of rootstock and flushing on the incidence of three insects on 'clementine de nules' citrus trees. | we evaluated the influence of six different citrus rootstocks on the incidence of the citrus leafminer, phyllocnistis citrella stainton (lepidoptera: gracillariidae), and the aphid species, aphis gossypii glover and a. spiraecola patch (hemiptera: aphididae), on 'clementine de nules' trees (citrus clementina hort. ex tan.). sampling was conducted during 2005 and 2006 in a grove of 3-yr-old trees in southern spain with six rootstocks arranged in a completely randomized block design. incidence (i. ... | 2008 | 19161697 |
| alleviation of salt stress in citrus seedlings inoculated with arbuscular mycorrhizal fungi depends on the rootstock salt tolerance. | seedlings of cleopatra mandarin (citrus reshni hort. ex tan.) and alemow (citrus macrophylla wester) were inoculated with a mixture of am fungi (rhizophagus irregularis and funneliformis mosseae) (+am), or left non-inoculated (-am). from forty-five days after fungal inoculation onwards, half of +am or -am plants were irrigated with nutrient solution containing 50 mm nacl. three months later, am significantly increased plant growth in both cleopatra mandarin and alemow rootstocks. plant growth wa ... | 2014 | 23859560 |
| an integrated view of whole-tree hydraulic architecture. does stomatal or hydraulic conductance determine whole tree transpiration? | hydraulic conductance exerts a strong influence on many aspects of plant physiology, namely: transpiration, co2 assimilation, growth, productivity or stress response. however we lack full understanding of the contribution of root or shoot water transport capacity to the total water balance, something which is difficult to study in trees. here we tested the hypothesis that whole plant hydraulic conductance modulates plant transpiration using two different seedlings of citrus rootstocks, poncirus ... | 2016 | 27223695 |
| molecular cloning and characterization of crnced1, a gene encoding 9-cis-epoxycarotenoid dioxygenase in citrus reshni, with functions in tolerance to multiple abiotic stresses. | abscisic acid (aba) is an important stress phytohormone that plays an essential role in mediating the signaling networks associated with plant responses to various abiotic stresses. in the present study, we isolated a gene crnced1 encoding the rate-limiting enzyme of aba synthesis, 9-cis-epoxycarotenoid dioxygenase (nced), from citrus reshni. expression patterns of crnced1 varied among different tissues, in which higher levels were measured in the leaves than in the roots. the steady-state mrna ... | 2014 | 24068300 |
| comparing morphological plasticity of root orders in slow- and fast-growing citrus rootstocks supplied with different nitrate levels. | studies of the plasticity of functional root traits involved in resource acquisition have focused mainly on root length without considering such 'morphological components' as biomass allocation, specific root length, root fineness, and tissue density that affect root length. the plasticity of the above components in response to nitrate supply was studied in each root order of two co-generic citrus rootstocks, namely the fast-growing citrus jambhiri 'rough lemon' (rl) and the slow-growing citrus ... | 2007 | 17881338 |
| a general method for the extraction of citrus leaf proteins and separation by 2d electrophoresis: a follow up. | with the aim of studying differentially expressed proteins as a function of abiotic and biotic stress in citrus plants, we optimized a protocol for the extraction of total leaf proteins and their 2-de separation using commercially available immobilized ph gradient strips (ipgs) in the first dimension. critical factors for good reproducibility of citrus leaf protein separation were identified: trichloroacetic acid (tca)/acetone precipitation after extraction in lysis buffer, sample fractionation ... | 2007 | 17035105 |
| leaf abscission induced by ethylene in water-stressed intact seedlings of cleopatra mandarin requires previous abscisic acid accumulation in roots. | the involvement of abscisic acid (aba) in the process of leaf abscission induced by 1-aminocyclopropane-1-carboxylic acid (acc) transported from roots to shoots in cleopatra mandarin (citrus reshni hort. ex tan.) seedlings grown under water stress was studied using norflurazon (nf). water stress induced both aba (24-fold) and acc (16-fold) accumulation in roots and arrested xylem flow. leaf bulk aba also increased (8-fold), although leaf abscission did not occur. shortly after rehydration, root ... | 1996 | 12226398 |
| 1-aminocyclopropane-1-carboxylic acid transported from roots to shoots promotes leaf abscission in cleopatra mandarin (citrus reshni hort. ex tan.) seedlings rehydrated after water stress. | the effect of water stress and subsequent rehydration on 1-aminocyclopropane-1-carboxylic acid (acc) content, acc synthase activity, ethylene production, and leaf abscission was studied in cleopatra mandarin (citrus reshni hort. ex tan.) seedlings. leaf abscission occurred when drought-stressed plants were allowed to rehydrate, whereas no abscission was observed in plants under water stress conditions. in roots of water-stressed plants, a high acc accumulation and an increase in acc synthase act ... | 1992 | 16652935 |