Morphological analysis and photosynthetic performance of improved papaya genotypes

Netto, Alena Torres; Campostrini, Eliemar; Azevedo, Letícia C.; Souza, Marcelo; Ramalho, José C.; Chaves, M. M.

doi:10.1590/s1677-04202009000300005

Cited by 14 publications

(5 citation statements)

References 43 publications

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“…Nonetheless, the higher g s and E , together with similar A net values of Golden compared to Sunrise Solo leaves resulted in reduced iWUE and WUE [see Supporting Information—Table S2 ] . Lower WUE confirm earlier results (Torres-Netto et al 2009), and could also be related to observed lower chlorophyll content. In soybean, reduced pigmentation in mutants linked to increase in g s and reduced iWUE and integrated canopy WUE (Slattery et al 2017).…”

Section: Discussionsupporting

confidence: 91%

“…The principal producers were India (5.69 million t from 133 000 ha), Brazil (1.42 million t from 30 372 ha), Mexico (0.95 million t from 16 820 ha) and Indonesia (0.90 million t from 9980 ha) (FAOSTAT 2016). Although Golden fruits are better accepted by consumers worldwide due to the superior appearance of the fruits, greater transport resilience and longer post-harvest, Golden plants are less vigorous (Torres-Netto et al 2009; Castro et al 2014) and lower yielding compared to ‘Sunrise Solo’ (90 vs. 120 t ha −1 in the whole cycle) (Caliman Agrícola, Linhares, Espiríto Santo, Brazil, pers. comm.…”

Section: Introductionmentioning

confidence: 99%

“…; Costa and Pacova 2003). Lower growth vigour and yield were first assumed to be related to the reduced chlorophyll and nitrogen (N) content of the leaves (Torres-Netto et al 2009; Castro et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Photosynthetic capacity, leaf respiration and growth in two papaya (Carica papaya) genotypes with different leaf chlorophyll concentrations

et al. 2019

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Golden genotype of papaya ( Carica papaya ), named for its yellowish leaves, produces fruits very much appreciated by consumers worldwide. However, its growth and yield are considerably lower than those of other genotypes, such as ‘Sunrise Solo’, which has intensely green leaves. We undertook an investigation with the goal of evaluating key physiological traits that can affect biomass accumulation of both Golden and Sunrise Solo genotypes. Papaya seeds from two different genotypes with contrasting leaf colour ‘Sunrise Solo’ and Golden were grown in greenhouse conditions. Plant growth (plant height, leaf number, stem diameter, leaf area, plant dry weight), leaf gas exchanges, leaf carbon balance, RuBisCO oxygenation and carboxylation rates, nitrogen, as well as chlorophyll concentrations and fluorescence variables were assessed. Although no significant differences were observed for photosynthetic rates between genotypes, the accumulation of small differences in photosynthesis, day after day, over a long period, might contribute to some extend to a higher C-budget in Sunrise Solo, higher leaf area and, thus, to higher productivity. Additionally, we consider that physiological processes other than photosynthesis and leaf respiration can be as well involved in lower growth and yield of Golden. One of these aspects could be related to the higher rates of photorespiration observed in Sunrise Solo, which could improve the rate of N assimilation into organic compounds, such as amino acids, thus contributing to the higher biomass production in Sunrise Solo relative to Golden. Further experiments to evaluate the effects of N metabolism on physiology and growth of Golden are required as it has the potential to limit its yield.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Photosynthetic capacity, leaf respiration and growth in two papaya (Carica papaya) genotypes with different leaf chlorophyll concentrations

et al. 2019

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“…Chlorophyll fluorescence (Fv/Fm) parameter is normally used to evaluate stress on the metabolism of the plant (Evlard et al, 2014;Linger et al, 2005). And, any alteration in the plant photosystem (where protein is involved in photosynthesis) highlights impairment in the photosynthetic process (Torres Netto et al, 2009). Misra et al (2012) found that Fv/Fm value between 0.78-0.84 indicates fitness of a plant.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Chelate-assisted phytoextraction: Growth and ecophysiological responses by Salix schwerinii E.L Wolf grown in artificially polluted soils

Mohsin

Kuittinen

Salam

et al. 2019

Journal of Geochemical Exploration

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“…For example, in a comparison of five different genotypes in Brazil, one cultivar (Golden) was identified, which, during the middle of the day, had stomatal conductance (and transpiration rates) higher than other four genotypes. However, over the 12-week period of measurements, photosynthetic rates were similar for all five genotypes (Torres-Netto et al ., 2009). In a similar comparison of five cultivars in South India, one (Co7) stood out from the others in many of the attributes measured in the field during the summer months, including gaseous exchange processes, cell membrane integrity and various chlorophyll indices.…”

Section: Plant Water Relationsmentioning

confidence: 99%

THE WATER RELATIONS AND IRRIGATION REQUIREMENTS OF PAPAYA (CARICA PAPAYAL.): A REVIEW

Carr

2013

Ex. Agric.

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SUMMARYPapaya has never been found in the wild, but is believed to have originated in tropical America from where it has spread throughout the tropics and subtropics. This fruit crop is particularly important in India and Brazil. Most research on the water relations of papaya has been undertaken in Brazil and on the island of Guam (United States of America). Papaya is a short-lived large herb, growing to a height of up to 10 m. Leaves emerge from the upper part of the unbranched stem. After a juvenile period, lasting for about two months, flowers begin to develop in leaf axils. Flowering continues throughout the year as new leaves emerge. The plants, which are dioecious, begin to bear fruit within a year after planting, sustaining high yields for two years before yields decline. The ‘effective’ root depth varies with the method of irrigation, but can reach 0.55 m. The seedlings and the trees are susceptible to wind damage, a topic that has been well researched. Stomata are only found on the abaxial leaf surface. They are sensitive to changes in the saturation deficit of the air. Stomata also respond quickly to changing light conditions. On clear days, midday suppression of photosynthesis occurs as a result of partial closure of the stomata. In the morning, there is a time lag between water loss by transpiration and sap flow, as water is taken from storage in the hollow stem. Few attempts have been made to measure the actual water use of papaya, and there are no reliable published values for the crop coefficient. Limitations to the design of the papaya irrigation experiments reported so far make it difficult to reconcile the results in practical ways. Water productivities equivalent to 1.8 to 2.8 kg (fresh fruit) m−3 (irrigation water) have been obtained. Although papaya is generally considered to be drought sensitive and responsive to irrigation, there is a shortage of good experimental evidence to support this view. There is a need to establish practical irrigation schedules for this remarkable crop. A uniformity of approach to irrigation experimentation and a common, universally agreed nomenclature would facilitate this process.

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Morphological analysis and photosynthetic performance of improved papaya genotypes

Cited by 14 publications

References 43 publications

Photosynthetic capacity, leaf respiration and growth in two papaya (Carica papaya) genotypes with different leaf chlorophyll concentrations

Photosynthetic capacity, leaf respiration and growth in two papaya (Carica papaya) genotypes with different leaf chlorophyll concentrations

Chelate-assisted phytoextraction: Growth and ecophysiological responses by Salix schwerinii E.L Wolf grown in artificially polluted soils

THE WATER RELATIONS AND IRRIGATION REQUIREMENTS OF PAPAYA (CARICA PAPAYAL.): A REVIEW

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