Leaf gas exchange and growth of two papaya (Carica papaya L.) genotypes are affected by elevated electrical conductivity of the nutrient solution

2017 ◽  
Vol 218 ◽  
pp. 230-239 ◽  
Author(s):  
Anderson Lopes Peçanha ◽  
Jefferson Rangel da Silva ◽  
Weverton Pereira Rodrigues ◽  
Tiago Massi Ferraz ◽  
Alena Torres Netto ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Gas Exchange ◽  
Nutrient Solution ◽  
Carica Papaya ◽  
Leaf Gas Exchange

scholarly journals Optimizing the Electrical Conductivity of a Nutrient Solution for Plant Growth and Bioactive Compounds of Agastache rugosa in a Plant Factory

Agronomy ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 76 ◽  
Author(s):  
Vu Phong Lam ◽  
Sung Jin Kim ◽  
Jong Seok Park
Keyword(s):  
Electrical Conductivity ◽  
Gas Exchange ◽  
Plant Growth ◽  
Bioactive Compounds ◽  
Nutrient Solution ◽  
Growth Parameters ◽  
Leaf Gas Exchange ◽  
Agastache Rugosa ◽  
Gas Exchange Parameters ◽  
Exchange Parameters

The objective of this study was to determine the proper electrical conductivity (EC) of a nutrient solution (NS) for accumulating bioactive compounds of Agastache rugosa without decreasing plant growth. Six-week-old seedlings were transplanted in a deep flow technique system with Hoagland NS with a 2.0 dS·m−1 EC for the initial week. From eight days after transplanting, the plants were treated with six EC treatments of 0.5, 1.0, 2.0, 4.0, 6.0, and 8.0 dS·m−1 for three weeks. Plant growth parameters, leaf gas exchange parameters, the relative chlorophyll value, and the ratio of variable to maximum fluorescence (Fv/Fm) were measured, and the rosmarinic acid (RA), tilianin, and acacetin concentrations were analyzed at 28 days after transplanting. The results showed that almost all plant growth parameters were maximized at 2.0 and 4.0 dS·m−1 and minimized at 8.0 dS·m−1 compared with the other EC treatments. The relative chlorophyll and Fv/Fm values were maximized at 2.0 and 4.0 dS·m−1. Similarly, leaf gas exchange parameters were increased at 2.0 and 4.0 dS·m−1. The RA content exhibited significantly higher values at 0.5, 1.0, 2.0, and 4.0 dS·m−1 compared with other treatments. The tilianin and acacetin contents exhibited the significantly highest values at 4.0 and 0.5 dS·m−1, respectively. These results suggest optimal EC treatment at 4.0 dS·m−1 for increasing bioactive compounds in A. rugosa plants without decreasing plant growth. Excessively high or low EC induced salinity stress or nutrient deficiency, respectively. Furthermore, among the plant organs, the roots of A. rugosa contained the highest RA concentration and the flowers contained the highest tilianin and acacetin concentrations, which revealed a higher utilization potential of the roots and flowers for bioactive compounds.

scholarly journals LEAF GAS EXCHANGE CHARACTERISTICS OF FOUR PAPAYA GENOTYPES DURING DIFFERENT STAGES OF DEVELOPMENT

2001 ◽  
Vol 23 (3) ◽  
pp. 522-525 ◽  
Author(s):  
ELIEMAR CAMPOSTRINI ◽  
OSVALDO KIYOSHI YAMANISHI ◽  
CARLOS A. MARTINEZ
Keyword(s):  
Gas Exchange ◽  
Carica Papaya ◽  
Leaf Gas Exchange ◽  
Carbon Dioxide Concentration ◽  
Field Capacity ◽  
Experimental Period ◽  
Clay Loam ◽  
Clay Loam Soil ◽  
Loam Soil ◽  
Gas Exchange Characteristics

In this research, was used four papaya (Carica papaya L.) genotypes: three from the 'Solo ( Sunrise Solo TJ, Sunrise Solo 72/12 and Baixinho de Santa Amália) group and one from the 'Formosa' group (Know-You 01). They were grown in plastic pots containing a sandy-clay-loam soil subjected to pH correction and fertilization, under greenhouse conditions. Throughout the experimental period plants were subjected to periodic irrigation to maintain the soil humitidy around field capacity. The experiment was conducted 73 days after sowing. In all genotypes, leaf gas exchange characteristics were determined. The net photosynthetic rate (A, mumol m-2 s-1 ), stomatal conductance (g s mol m-2 s-1), leaf temperature (T I, 0C) and intercellular carbon dioxide concentration (ci, muL L-1) on the 4th, 5th, 6th, 7th, 8th and 9th leaves from the plant apex were determined. No significant differences were observed for A, g s, c i, or Tl either among the leaves sampled from any of the genotypes. A was positively correlated with g s and in the other hand T I and g s were negatively correlated. The results suggest that, for 73 DAP, all the sampled papaya leaves functioned as sources of organs.

Photosynthetic Response to Light and Nutrients in Sun-Tolerant and Shade-Tolerant Rainforest Trees. II. Leaf Gas Exchange and Component Processes of Photosynthesis

1992 ◽  
Vol 19 (1) ◽  
pp. 19 ◽  
Author(s):  
WA Thompson ◽  
LK Huang ◽  
PE Kriedemann
Keyword(s):  
Gas Exchange ◽  
Nutrient Solution ◽  
Shade Tolerance ◽  
Leaf Gas Exchange ◽  
Deciduous Tree ◽  
O2 Evolution ◽  
Light Saturation ◽  
Evergreen Species ◽  
Strong Light ◽  
Weak Light

Species with contrasting shade tolerance were grown under three light by two nutrient treatments. Gas exchange by intact leaves, leaf disk O2 evolution and chlorophyll fluorescence were measured. In shade-tolerant evergreen species (Argyrodendron sp., A. trifoliolatum and Flindersia brayleyana) photosynthetic activity of seedlings in air at light saturation (A) was lower under weak (30 pmol quanta m-2 day-1 ), compared with medium (130) or strong light (535). In Toona australis, a shade-intolerant and deciduous tree, A was reduced 44% from strong to weak light treatment on high nutrients (71 mg N L-1 nutrient solution). Nevertheless, nitrogen-use efficiency for leaf photosynthesis was highest in Toona under all growing conditions and, with higher specific leaf area, probably contributes towards fast occupancy of sites which underlies early succession in this species. All species made photosynthetic and respiratory adjustments from strong to medium to weak light, which resulted in a lower light compensation point (Q0). Such adjustments were accentuated by low nutrient supply (1.0 mg N L-1 nutrient solution) and were especially pronounced for shade-intolerant Toona. Reduced Q0 in Toona was accompanied by lower A and light saturation point (QA). Both species of Argyrodendron showed no decrease in QA despite reduction in Q0 under weak light.Contrary to expectation, photosynthetic responses to light × nutrient treatments did not correlate with degree of shade tolerance accorded each species by rainforest ecologists.

scholarly journals Comparative Physiological Analysis of Salinity Effects in Six Olive Genotypes

HortScience ◽  
2014 ◽  
Vol 49 (7) ◽  
pp. 901-904 ◽  
Author(s):  
Carolina Aparicio ◽  
Miguel Urrestarazu ◽  
María del Pilar Cordovilla
Keyword(s):  
Gas Exchange ◽  
Nutrient Solution ◽  
Leaf Gas Exchange ◽  
Saline Stress ◽  
Stress Symptoms ◽  
Physiological Analysis ◽  
Half Strength ◽  
Exclusion Mechanism ◽  
Hoagland Nutrient Solution ◽  
And Oxidative Stress

Changes caused by NaCl salinity on growth, gas exchange, chemical composition, and oxidative stress symptoms have been measured in six olive (Olea europaea L.) cultivars (Casta Cabra, Cornicabra, Frantoio, Ocal, Picual, and Picudo) grown in nutrient solution in a growth chamber pot experiment. Six-month-old plants were transplanted to a sand–perlite culture and irrigated with half-strength Hoagland nutrient solution containing 0 and 200 mm NaCl for 12 weeks. Salinity significantly depressed growth and leaf gas exchange, but to a different degree in each cultivar, Picudo was the cultivar that showed less growth inhibition. The effectiveness of Na+ exclusion mechanism in the roots differed significantly among studied cultivars, working effectively in ‘Ocal’ and ‘Picudo’ and being less efficient in ‘Picual’. Furthermore, ‘Picudo’ showed the ability to maintain the concentration of leaf K+ under the stress condition. ‘Ocal’ accumulated phenolic compounds and did not reduce carotenoid or total thiol concentration under saline stress. Between the cultivars studied, ‘Picudo’ and ‘Ocal’ were the most tolerant.

scholarly journals Effect of Salinity on Yield, Fruit Quality, Leaf Gas Exchange, and Mineral Composition of Grafted Watermelon Plants

HortScience ◽  
2006 ◽  
Vol 41 (3) ◽  
pp. 622-627 ◽  
Author(s):  
Guiseppe Colla ◽  
Youssef Roupahel ◽  
Mariateresa Cardarelli ◽  
Elvira Rea
Keyword(s):  
Gas Exchange ◽  
Mineral Composition ◽  
Nutrient Solution ◽  
Fruit Quality ◽  
Leaf Gas Exchange ◽  
Citrullus Lanatus ◽  
Total Yield ◽  
Leaf Tissue ◽  
Growth Yield ◽  
Marketable Yield

A greenhouse experiment was carried out to determine growth, yield, fruit quality, gas exchange and mineral composition of watermelon plants (Citrullus Lanatus L. `Tex'), either ungrafted or grafted onto two commercial rootstocks `Macis' [Lagenaria siceraria (Mol.) Standl.] and `Ercole' (Cucurbita maxima Duchesne × Cucurbita moschata Duchesne) and cultured in NFT. Plants were supplied with a nutrient solution having an electrical conductivity (EC) of 2.0 or 5.2 dS·m–1. The saline nutrient solution had the same basic composition, plus an additional of 29 mm of NaCl. Increased salinity in the nutrient solution decreased total yield. The reduction in total yield in saline treatments compared to control was due to a reduction in the fruit mean mass and not to the number of fruit per plant. Total fruit yield was 81% higher in grafted than in ungrafted plants. The lowest marketable yield recorded on ungrafted plants was associated with a reduction in both fruit mean mass and the number of fruits per plant in comparison to grafted plants. Salinity improved fruit quality in all grafting combinations by increasing dry matter (DM), glucose, fructose, sucrose, and total soluble solid (TSS) content. Nutritional qualities of grafted watermelons such as fruit DM, glucose, fructose, sucrose, and TSS content were similar in comparison to those of ungrafted plant. In all grafting combinations, negative correlations were recorded between Na+ and Cl– in the leaf tissue and net assimilation of CO2 Grafting reduced concentrations of sodium, but not chloride, in leaves. However, the sensitivity to salinity was similar between grafted and ungrafted plants and the higher total yield from grafting plants was mainly due to grafting per se.

scholarly journals Production of Passion fruit in a semi-hydroponic system under protected cultivation

2019 ◽  
Vol 41 (5) ◽  
Author(s):  
Douglas José Marques ◽  
José Andres Carreño Siqueira ◽  
Hudson Carvalho Bianchini ◽  
Vinicius Mendes Alves
Keyword(s):  
Electrical Conductivity ◽  
Gas Exchange ◽  
Nutrient Solution ◽  
Block Design ◽  
Passion Fruit ◽  
Passiflora Edulis ◽  
Hydroponic System ◽  
Nutrient Contents ◽  
Protected Cultivation ◽  
Nutrient Solutions

Abstract The objective of this research was to evaluate the production of passion fruit (Passiflora edulis Sims) cultivars in different nutrient solutions, using commercial Bioplant® substrate in slabs system in protected cultivation. A randomized complete block design in a factorial scheme was used with 2 passion fruit cultivars (Araguari and Yellow Master) x 4 nutrient solutions (solution 1, solution 2, solution 3 and solution 4), each plot consisting of 6 plants with 6 replications. Electrical conductivity evaluations in the slabs drained solution started at 15 days after seedling transplantation and the nutrient contents were quantified at the end of the research. In passion fruit, ether extract, crude fiber and crude protein were evaluated. Fruit number, pulp mass, peel thickness and gas exchange were evaluated. It was concluded that the use of nutrient solution 2 in cultivar Yellow Master, with 2.72 dS m-1 electrical conductivity and the use of nutrient solution 4 in cultivar Araguari, with 2.95 dS m-1 electrical conductivity, yielded the largest number of fruits, pulp mass, fruit mass and gas exchange, in slabs system in the protected cultivation of passion fruit.

scholarly journals Leaf Gas Exchange Responses to Irrigation Timing and Nigari (Effluent of Salt Industries) of Sweet Pepper (Capsicum annuum L.) in Soilless Culture

HortScience ◽  
2012 ◽  
Vol 47 (11) ◽  
pp. 1574-1579 ◽  
Author(s):  
Md. Jahedur Rahman ◽  
Haruhisa Inden ◽  
Masaaki Kirimura
Keyword(s):  
Gas Exchange ◽  
Nutrient Solution ◽  
Leaf Gas Exchange ◽  
Sweet Pepper ◽  
Growth Stages ◽  
Vegetable Production ◽  
Gas Exchange Parameters ◽  
Application Timing ◽  
Vegetative And Reproductive Growth ◽  
Exchange Parameters

There is increasing interest in reducing fertilizer cost and establishing proper irrigation management for sustainable vegetable production. Nigari, an effluent of salt industries, is cheaper than commercial fertilizers. Another important vegetable production factor is nutrient application timing to improve soilless cultivation in crops like sweet pepper. Therefore, this study evaluated the effects of nigari and nutrient solution application timing on leaf gas exchanges of sweet pepper cultivated under a soilless system. Treatments included three nigari rates [no nigari plus a standard nutrient solution as control, 2 mL·L−1 nigari + additional nitrogen–phosphorus–potassium (N–P–K) to equal the standard, and 4 mL·L−1 nigari + additional N–P–K to equal the standard]. Three daily application timings (T1 = 0700 hr + 1500 hr, T2 = 0900 hr + 1500 hr, and T3 = 0700 hr + 0900 hr + 1500 hr) were used for each nutrient solution. Leaf gas exchange parameters were studied during the vegetative and reproductive growth stages of sweet pepper cv. Papri new-E-red. Photosynthetic responses and its related parameters, namely transpiration (E), stomatal conductance (gS), and maximum photosynthesis (Amax), were significantly affected by nigari rates and nutrient solution application timing. Photosynthesis-related parameters, E, gS, Amax, and initial slope of photosynthesis in response to light curve were the highest and light compensation point (LCP) and leaf vapor pressure deficit (LVPD) were the lowest at 2 mL·L−1 nigari compared with the control at both plant vegetative and reproductive growth stages. For nutrient solution application timing, the highest E, gS, and Amax were observed at T3 treatment at both plant growth stages. Furthermore, marketable yield of sweet pepper was the highest when 2 mL·L−1 nigari was applied at 0700, 0900, and 1500 hr a day. Leaf gas exchange parameters showed that nutrient solution application timing of 0700, 0900, and 1500 hr a day was better for obtaining high yield of sweet pepper under nigari treatment in soilless culture.

scholarly journals Enhanced nitric oxide synthesis through nitrate supply improves drought tolerance of sugarcane plants

2019 ◽  
Author(s):  
Maria D. Pissolato ◽  
Neidiquele M. Silveira ◽  
Paula J. Prataviera ◽  
Eduardo C. Machado ◽  
Amedea B. Seabra ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Gas Exchange ◽  
Nitrate Reductase ◽  
Drought Tolerance ◽  
Root Growth ◽  
Water Deficit ◽  
Nutrient Solution ◽  
Leaf Gas Exchange ◽  
No Production ◽  
Nitrate Supply

AbstractNitric oxide (NO) is an important signaling molecule associated with many biochemical and physiological processes in plants under stressful conditions. Nitrate reductase (NR) not only mediates the reduction of NO3− to NO2− but also reduces NO2− to NO, a relevant pathway for NO production in higher plants. Herein, we hypothesized that sugarcane plants supplied with more NO3− as a source of N would produce more NO under water deficit. Such NO would reduce oxidative damage and favor photosynthetic metabolism and growth under water limiting conditions. Sugarcane plants were grown in nutrient solution and received the same amount of nitrogen, with varying nitrate:ammonium ratios (100:0 and 70:30). Plants were then grown under well-watered or water deficit conditions, in which the osmotic potential of nutrient solution was −0.15 and −0.75 MPa, respectively. Under water deficit, plants exhibited higher root [NO3−] and [NO2−] when supplied with 100% NO3−. Accordingly, the same plants also showed higher root NR activity and root NO production. We also found higher photosynthetic rates and stomatal conductance in plants supplied with more NO3−, which improved root growth. ROS accumulation was reduced due to increases in the activity of catalase in leaves and superoxide dismutase and ascorbate peroxidase in roots of plants supplied with 100% NO3− and facing water deficit. Such positive responses to water deficit were offset when a NO scavenger was supplied to the plants, thus confirming that increases in leaf gas exchange and plant growth were induced by NO. Concluding, NO3− supply is an interesting strategy for alleviating the negative effects of water deficit on sugarcane plants, increasing drought tolerance through enhanced NO production. Our data also provide insights on how plant nutrition could improve crop tolerance against abiotic stresses, such as drought.HighlightsNitrate supply improves sugarcane growth under water deficit.Nitrate supply stimulated nitrate reductase activity and NO synthesis in sugarcane roots facing water deficit.Leaf gas exchange was increased by nitrate supply as well as root growth under water limiting conditions.Antioxidant responses were also improved in plants supplied exclusively with nitrate.Nitrogen management may be an interesting strategy for improving drought tolerance in sugarcane fields.

scholarly journals Leaf Gas-exchange and Ion Content of Papaya Plants Simultaneously Exposed to Salinity and Flooding

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 780E-780
Author(s):  
Thomas E. Marler
Keyword(s):  
Stomatal Conductance ◽  
Gas Exchange ◽  
Nutrient Solution ◽  
Leaf Gas Exchange ◽  
Dry Weight ◽  
Stomatal Response ◽  
Ion Content ◽  
Weight Concentration ◽  
Slow Decline ◽  
Stems And Leaves

A container study and a hydroponics study were conducted to determine gas-exchange and ion content of `Cariflora' papaya plants as influenced by a combination of salinity and flooding. Plants grown in nutrient solution were subjected to 1 or 8 dS·m–1 as salinity treatments and 6.54, 3.62, or 0.92 mg oxygen/liter as the flooding treatments. Plants in the container study were subjected to 0, 4, or 8 dS·m–1 as salinity treatments, and half of the plants in each salinity level were flooded. Leaf gas-exchange began to decline by day 1 in all plants receiving flooding, and was zero by day 5. In contrast, gas-exchange of plants experiencing salinity began a slow decline after 5 to 7 days. Stomatal conductance of salinized plants was 25% to 33% of the control plants in the container study after 39 days. No interaction occurred between flooding and salinity treatments since the stomatal response to flooding was so rapid across all levels of salinity. Roots and stems played a major role in storing Na+ and Cl– in salinized plants. For example, stems contained more than two times the dry weight concentration of both ions as did leaves. Older leaves accumulated more Na+ and Cl– than did younger leaves. Flooding decreased Na+ and Cl– accumulation in roots, stems, and leaves in all salinized plants.

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