Pineapple

Bartholomew, D. P.; Kadzimin, Saleh

doi:10.1016/b978-0-12-055650-2.50010-1

Cited by 34 publications

(15 citation statements)

References 56 publications

(80 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The extent of this recycling can be calculated with the equation proposed by Gerbaud and Andre (15). We determined from the data of Figure 2 that the 'true' value of 02-uptake during phase III was underestimated by only about 3% when the value of stomatal resistance is taken to equal 150 s cm-' (5). Thus, the underestimation of '802-uptake due to oxygen recycling could not account for the low 02-uptake rate measured during the beginning of the day, and an inhibition of photorespiration due to the previously reported increase in the intracellular C02-concentration is the most probable explanation for this low rate of 02-uptake.…”

Section: Light 02-uptake Under Continuous Illuminationmentioning

confidence: 99%

CO₂ and O₂ Exchanges in the CAM Plant Ananas comosus (L.) Merr

Côté¹,

André²,

Folliot³

et al. 1989

Plant Physiol.

View full text Add to dashboard Cite

Photosynthesis and light 02-uptake of the aerial portion of the CAM plant Ananas comosus (L.) meff. were studied by C02 and 02 gas exchange measurements. The amount of C02 which was fixed during a complete day-night cycle was equal to the amount of total net 02 evolved. This finding justifies the assumption that in each time interval of the light period, the difference between the rates of net 02-evolution and of net light atmospheric C02-uptake give the rates of malate-decarboxylation-dependent C02 assimilation. Based upon this hypothesis, the following photosynthetic characteristics were observed: (a) From the onset of the light to midphase IV of CAM, the photosynthetic quotient (net 02 evolved/net C02 fixed) was higher than 1. This indicates that malate-decarboxylation supplied C02 for the photosynthetic carbon reduction cycle during this period. (b) In phase IlIl and early phase IV, the rate of C02 assimilation deduced from net 02-evolution was 3 times higher than the maximum rate of atmospheric C02-fixation during phase IV. A conceivable explanation for this stimulation of photosynthesis is that the intracellular C02-concentration was high because of malate decarboxylation. (c) During the final hours of the light period, the photosynthetic quotient decreased below 1. This may be the result of C02-fixation by phosphoenolpyruvate-carboxylase activity and malate accumulation. Based upon this hypothesis, the gas exchange data indicates that at least 50% of the C02 fixed during the last hour of the light period was stored as malate. Light 02-uptake determined with 1802 showed two remarkable characteristics: from the onset of the light until midphase IV the rate of 02-uptake increased progressively; during the following part of the light period, the rate of 02-uptake was 3.5 times higher than the maximum rate of C02-uptake. When malate decarboxylation was reduced or suppressed after a night in a C02-free atmosphere or in continuous illumination, the rate of 02-uptake was higher than in the control. This supports the hypothesis that the low rate of 02-uptake in the first part of the light period is due to the inhibition of photorespiration by increased intracellular CO2 concentration because of malate decarboxylation. In view of the law of gas diffusion and the kinetic properties of the ribulose-1,5-bisphosphate carboxylase/oxygenase, 02 and C02 gas exchange suggest that at the end of the light period the intracellular CO2 concentration was very low. We propose that the high ratio of 02-uptake/C02-fixation is principally caused by the stimulation of photorespiration during this period.Crassulacean acid metabolism affords a mechanism for the temporal separation ofC02-fixation and C02-reduction. During the dark period, PEP-Case' catalyses the fixation of CO2 and malate is formed. During the light period, CO2 is released from malate decarboxylation. This CO2 is fixed by Rubisco and assimilated in the PCR (in this paper, the term C02-assimilation means C02-reduction in the PCR). Atmospheric C02-uptake is also ...

show abstract

Section: Light 02-uptake Under Continuous Illuminationmentioning

confidence: 99%

CO₂ and O₂ Exchanges in the CAM Plant Ananas comosus (L.) Merr

Côté¹,

André²,

Folliot³

et al. 1989

Plant Physiol.

View full text Add to dashboard Cite

show abstract

“…This new information allows farmer i to calculate f (x j,t−5 ) + ε j,t = π j,t −x j,t−5 w j,t−5 and this informs his beliefs about the productivity of input level x j,t−5 , leading him to update his previously held expectation (dated at some time t p prior to t): f i,t p (x j,t−5 ) to f i,t (x j,t−5 ). Note that farmers know growing conditions, w, so these expectations reflect only uncertainty due to ε and imperfect knowledge of f. Rather than focus on a specific mechanism or type of learning, we 9 See Section 3.1 for operational definitions of information neighbors. 10 Figure 1 is drawn for the production function (1).…”

Section: A Learning Modelmentioning

confidence: 99%

“…6 and past growing conditions and observation of inputs and profits for all previous plantings conducted by his information neighbors 9 , as well as his own previous plantings.…”

Section: A Learning Modelmentioning

confidence: 99%

See 1 more Smart Citation

Learning about a New Technology: Pineapple in Ghana

Conley

Udry

2010

American Economic Review

1,613

1,018

View full text Add to dashboard Cite

This paper investigates the role of social learning in the diffusion of a new agricultural technology in Ghana. We use unique data on farmers' communication patterns to define each individual's information neighborhood, the set of others from whom he might learn.Our empirical strategy is to test whether farmers adjust their inputs to align with those of their information neighbors who were surprisingly successful in previous periods. We present evidence that farmers adopt surprisingly successful information neighbors' practices, conditional on many potentially confounding factors including common growing conditions, credit arrangements, clan membership, and religion. The relationship of these input adjustments to experience further supports their interpretation as resulting from social learning. In ad- * The authors have benefitted from the advice of

show abstract

“…belongs to the family Bromeliaceae which encompasses about 50 genera and 2000 species mostly epiphytic [1]. It is a tropical fruit native to Central and South America specifically southern Brazil and Paraguay where wild relatives occur [2].…”

Section: Introductionmentioning

confidence: 99%

Physicochemical, Proximate and Sensory Properties of Pineapple (<i>Ananas</i> sp.) Syrup Developed from Its Organic Side-Stream

Tortoe¹,

Johnson²,

Slaghek³

et al. 2013

FNS

View full text Add to dashboard Cite

A major economical industrial challenge from pineapple (Ananas sp.) processing contributing to environmental pollution is the organic side-streams of pineapple. The physicochemical, proximate and sensory properties of organic sidestream pineapple syrup (OSPS) developed from Smooth cayenne, Sugar loaf and MD 2 pineapple varieties were evaluated. Organic side-stream pineapple syrup developed from MD 2 recorded the highest moisture content with a corresponding water activity. The colour change in OSPS was significant among the three varieties and Sugar loaf variety deviated from the standard yellow colour more than Smooth cayenne and MD 2 varieties. This was buttress by the high Total Soluble Solids in 10% and 20% dilutions of Sugar loaf. The OSPS was acidic. In bread, incorporating 5% OSPS (w:w) of Sugar loaf recorded the highest percentage acceptability among the pineapple varieties. Interestingly, in the production of cakes with 15%, 20% and 30% OSPS, MD 2 recorded the highest percentage overall acceptance. For bread and cake, there was varied significance (P < 0.05) of the sensory properties for appearance, colour, aroma, taste, texture, crust, mouthfeel and overall acceptance. Notably, cake and bread with incorporated OSPS of 15% MD 2 and 5% Sugar loaf was more acceptable.

show abstract

Pineapple

Cited by 34 publications

References 56 publications

CO₂ and O₂ Exchanges in the CAM Plant Ananas comosus (L.) Merr

CO₂ and O₂ Exchanges in the CAM Plant Ananas comosus (L.) Merr

Learning about a New Technology: Pineapple in Ghana

Physicochemical, Proximate and Sensory Properties of Pineapple (<i>Ananas</i> sp.) Syrup Developed from Its Organic Side-Stream

Contact Info

Product

Resources

About

Pineapple

Cited by 34 publications

References 56 publications

CO2 and O2 Exchanges in the CAM Plant Ananas comosus (L.) Merr

CO2 and O2 Exchanges in the CAM Plant Ananas comosus (L.) Merr

Learning about a New Technology: Pineapple in Ghana

Physicochemical, Proximate and Sensory Properties of Pineapple (&lt;i&gt;Ananas&lt;/i&gt; sp.) Syrup Developed from Its Organic Side-Stream

Contact Info

Product

Resources

About

CO₂ and O₂ Exchanges in the CAM Plant Ananas comosus (L.) Merr

CO₂ and O₂ Exchanges in the CAM Plant Ananas comosus (L.) Merr

Physicochemical, Proximate and Sensory Properties of Pineapple (<i>Ananas</i> sp.) Syrup Developed from Its Organic Side-Stream