Photosynthesis and stomatal conductance of potato leaves?effects of leaf age, irradiance, and leaf water potential

Vos, J.; Oyarzún, Pedro J.

doi:10.1007/bf00055065

Cited by 92 publications

(41 citation statements)

References 15 publications

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“…Crop senescence takes place earlier at higher temperatures (Menzel 1985a) although the total length of the growing period may last longer because the total period of leaf formation may increase (Marinus and Bodlaender 1975). Leaf longevity has been recorded to last between 1440 and 1760 ocd (Vos and Oyarzun 1987). A leaf formed was estimated to be functional for about 23 days at 20 oc and 12 days at 30 oc by Ingram and McCloud (1984) under conditions in Florida.…”

Section: Phasementioning

confidence: 99%

Modelling development and growth of the potato crop influenced by temperature and daylength: LINTUL-POTATO

Kooman

Haverkort²

1995

Current Issues in Production Ecology

114

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Abstract. A model 'LINTUL-POT ATO' is described which bases total dry matter production on light use efficiency of intercepted light by a potato crop. The course of light interception by green leaves initially is temperature-sum dependent and is also steered by influences of daylength and temperature on assimilate partitioning. Dry matter allocation to the foliage, which determines the final length of the growing period, is determined by a day length and temperature dependent period between emergence and tuber initiation and subsequent partitioning of dry matter to the tubers. Once the tuber daily growth rate equals total crop dry matter accumulation, no more foliage is formed and the crop senesces faster at higher temperatures. The aim of this paper is to explain effects of temperature and daylength on total tuber production from the effects of these environmental factors on the underlying processes. The relative effect of temperature on rates of emergence, light use efficiency, tuber initiation and tuber growth, and, the effect of daylength on development rate until tuber initiation are represented quantitatively. Potential tuber production at some temperature and day length regimes is calculated exploratively and compared with results from the literature. The model can be used to simulate tuber dry matter production in specific environments and to select cultivars for such environments with suitable temperature and daylength reactions on tuber initiation and dry matter partitioning so as to maximise yields.

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Section: Phasementioning

confidence: 99%

Modelling development and growth of the potato crop influenced by temperature and daylength: LINTUL-POTATO

Kooman

Haverkort²

1995

Current Issues in Production Ecology

114

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“…The four pairs of HT and HS accessions used in our experiments were chosen from a previous screening of 59 species (13 (20), which is accelerated by high temperature (4). Although the young leaves of HS accessions showed characteristics of heat tolerance, we estimated that they accounted for less than one third of the plant's total leaf area.…”

Section: Discussionmentioning

confidence: 99%

Photosynthesis at High Temperature in Tuber-Bearing Solanum Species

Reynolds¹,

Ewing²,

Owens³

1990

Plant Physiol.

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Differences in the photosynthetic performance between pairs of heat tolerant (HT) and heat sensitive (HS) accessions of tuberbearing Solanum species were measured at 40 OC, after treating plants at 40/30 IC. After 1 to 9 days of heat treatment, both HT and HS accessions showed progressive inhibitory effects, pnmarily decreased rates of CO2 fixation, and loss of leaf chlorophyll. These effects were most pronounced in the HS accessions. Stomatal conductivity and intemal CO2 concentrations were lower for both accessions at 40 OC especially for the HS accessions, suggesting that at ambient CO2 concentrations, stomatal conductance was limiting CO2 availability at the higher temperature. In the HT accessions, stomatal limitations were largely attributed to differences in vapor pressure deficit between 25 0 and 40°C, while the HS accessions exhibited significant nonstomatal limitations. The young expanding leaves of the HS accession showed some HT characteristics, while the oldest leaves showed severe senescence symptoms after 9 days at 40/30 "C. The data suggest that differences in heat sensitivity between HT and HS accessions are the result of accelerated senescence, chlorophyll loss, reduced stomatal conductance, and inhibition of dark reactions at high temperature.It is one of the challenges of crop scientists to find ways of improving plant yield in stressful environments. One important approach to this work is to identify stress-related physiological processes that impair plant performance so that screening procedures can be developed to select better adapted cultivars. It is well established that whole leaf photosynthesis is inhibited at high temperatures in nonacclimated plants (1). However, for most crop species it is not known whether differences in the degree to which photosynthesis is impaired at elevated temperatures are causally related to differences in

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“…Gaseous exchange is reported to greatly differ with leaf age [10] [19], genotypes [20], atmospheric water demand or irrigation [21] [22], nitrogen [10] [23] and climatic factors in potatoes [24]. Severe water stress is said to accelerate leaf VPD in plants [25] [26].…”

Section: Discussionmentioning

confidence: 99%

“…Leaf water potential possibly provided good comparison between Taewa and modern potato cultivars when drought intensity was high in 2010/ 2011 compared to the 2009/2010 growing season. The reason is that a high water vapour gradient results in leaf water deficits declining A n and T rate [25] because of stomatal closure induced by high leaf water potential approached after maximum leaf transpiration and water deficits [19].…”

Section: Discussionmentioning

confidence: 99%

Photosynthetic Water Use Efficiency of Heritage and Modern Potatoes under Limited and Unlimited Water Environments

Fandika¹,

Kemp²,

Millner³

et al. 2014

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Photosynthesis and stomatal conductance of potato leaves?effects of leaf age, irradiance, and leaf water potential

Cited by 92 publications

References 15 publications

Modelling development and growth of the potato crop influenced by temperature and daylength: LINTUL-POTATO

Modelling development and growth of the potato crop influenced by temperature and daylength: LINTUL-POTATO

Photosynthesis at High Temperature in Tuber-Bearing Solanum Species

Photosynthetic Water Use Efficiency of Heritage and Modern Potatoes under Limited and Unlimited Water Environments

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