Photosynthesis and Stomatal Conductance of Potato Clones (<i>Solanum tuberosum</i> L.)

Dwelle, R. B.; Hurley, P. J.; Pavek, J. J.

doi:10.1104/pp.72.1.172

Cited by 29 publications

(13 citation statements)

References 3 publications

(3 reference statements)

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“…The morphological responses were similar to the continuous illumination injury described by Cao and Tibbitts (1991). The A net values of leaves grown under HL conditions were comparable to A net values previously reported for plants of comparable ages and grown under similar environmental conditions (Dwelle et al, 1983).…”

Section: Net Carbon Assimilationsupporting

confidence: 88%

Interacting Effects of Photoperiod and Photosynthetic Photon Flux on Net Carbon Assimilation and Starch Accumulation in Potato Leaves

Stutte¹,

Yorio²,

Wheeler³

1996

jashs

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The effect of photoperiod (PP) on net carbon assimilation rate (Anet) and starch accumulation in newly mature canopy leaves of `Norland' potato (Solanum tuberosum L.) was determined under high (412 ∝mol·m-2·s-1) and low (263 ∝mol·m-2·s-1) photosynthetic photon flux (PPF) conditions. The Anet decreased from 13.9 to 11.6 and 9.3 μmol·m-2·s-1, and leaf starch increased from 70 to 129 and 118 mg·g-1 drymass (DM) as photoperiod (PP) was increased from 12/12 to 18/6, and 24/0, respectively. Longer PP had a greater effect with high PPF conditions than with low PPF treatments, with high PPF showing greater decline in Anet. Photoperiod did not affect either the CO2 compensation point (50 μmol·mol-1) or CO2 saturation point (1100-1200 μmol·mol-1) for Anet. These results show an apparent limit to the amount of starch that can be stored (≈15% DM) in potato leaves. An apparent feedback mechanism exists for regulating Anet under high PPF, high CO2, and long PP, but there was no correlation between Anet and starch concentration in individual leaves. This suggests that maximum Anet cannot be sustained with elevated CO2 conditions under long PP (≥12 hours) and high PPF conditions. If a physiological limit exists for the fixation and transport of carbon, then increasing photoperiod and light intensity under high CO2 conditions is not the most appropriate means to maximize the yield of potatoes.

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Section: Net Carbon Assimilationsupporting

confidence: 88%

Interacting Effects of Photoperiod and Photosynthetic Photon Flux on Net Carbon Assimilation and Starch Accumulation in Potato Leaves

Stutte¹,

Yorio²,

Wheeler³

1996

jashs

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“…This is the basis for the search for high rates of photosynthesis as proposed by Dwelle et al (1983). However, in our studies correlations between rates of photosynthesis and RGR, NAR, and TDWT were generally low, with the exception of batches including non-tuberosum species (III, V, VI, VII - Table 3).…”

Section: Discussionmentioning

confidence: 38%

Sources of heat tolerance amongst potato cultivars, breeding lines, and Solanum species

Midmore

Prange

1991

Euphytica

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This study assessed 46 potato cultivars, breeding lines and Solanum spp. for heat-tolerance using short-term growth rates and carbon assimilation measurements of young in-vitro-derived plants. Plants of the 46 clones and species were transferred from greenhouse conditions to controlled conditions set at 33/25° C day/night with 12 h photosynthetic photon flux density (PPFD) at 430--450/xmol m-2s -1 and an 8 h daylength extension (6/xmol m-2s-1), to inhibit tuberization. Twenty eight accessions were also grown in a 20/10°C controlled environment. Plants were harvested after 10 and 20 days and dry weights of the plant components were measured for plant growth analysis. Gas exchange (leaf net photosynthesis and maintenance dark respiration) and leaf chlorophyll fluorescence parameters (O, P, and T) were measured at 30 ° C. Amongst the 30 accessions grown at both hot and cool temperatures, only two accessions (Yungay and AVRDC 1287.19) produced more dry weight in the hot chamber than the cool chamber. Hot/cool ratios for net assimilation rate (NAR) and relative growth rate (RGR) exceeded unity in five and six accessions, respectively. For the 46 accessions grown under hot conditions, none had significantly greater values than those of the control clones for RGR and NAR. Differences between clones in maintenance respiration and net photosynthesis were more closely related to RGR, NAR, and total dry weight (TDWT) in clones which invested more dry weight in leaves and less in stems. Attributes of the chlorophyll fluorescence curve did not explain more of the clonal variation in RGR, NAR, and TDWT than did gas exchange parameters. No single gas exchange or fluorescence character explained more than 50% of the variability among clones for NAR, RGR, or TDWT, but combination of favourable attributes could improve potato heat tolerance in the future.

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“…It must be noted that we evaluated the responses of photosynthesis and conductance to a level of irradiance that is approximately equivalent to two third of full sunlight. However, Dwelle et al [3] reported field observations showing that conductance of potato leaves still continued to increase with radiation when photosynthesis was already saturated. In line with their results we measured with a crop enclosure [1] a constant ratio of circa 0.01 g CO2 g-~ H20 between the rates of photosynthesis and transpiration when irradiance varied between circa 35 and 350Win -2 (PAR) (Vos, unpublished).…”

Section: Effects Of Irradiancementioning

confidence: 99%

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

Vos

Oyarzún

1987

Photosynth Res

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Potatoes (Solanum tuberosum L., cv. Bintje) were grown in a naturally lit glasshouse. Laboratory measurements on leaves at three insertion levels showed a decline with leaf age in photosynthetic capacity and in stomatal conductance at near saturating irradiance. Conductance declined somewhat more with age than photosynthesis, resulting in a smaller internal CO2 concentration in older relative to younger leaves. Leaves with different insertion number behaved similarly. The changes in photosynthesis rate and in nitrogen content with leaf age were closely correlated. When PAR exceeded circa 100 W m(-2) the rate of photosynthesis and stomatal conductance changed proportionally as indicated by a constant internal CO2 concentration. The photosynthesis-irradiance data were fitted to an asymptotic exponential model. The parameters of the model are AMAX, the rate of photosynthesis at infinite irradiance, and EFF, the slope at low light levels. AMAX declined strongly with leaf age, as did EFF, but to a smaller extent. During drought stress photosynthetic capacity declined directly with decreasing water potential (range -0.6 to -1.1 MPa). Initially, stomatal conductance declined faster than photosynthetic capacity.

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Photosynthesis and Stomatal Conductance of Potato Clones (Solanum tuberosum L.)

Cited by 29 publications

References 3 publications

Interacting Effects of Photoperiod and Photosynthetic Photon Flux on Net Carbon Assimilation and Starch Accumulation in Potato Leaves

Interacting Effects of Photoperiod and Photosynthetic Photon Flux on Net Carbon Assimilation and Starch Accumulation in Potato Leaves

Sources of heat tolerance amongst potato cultivars, breeding lines, and Solanum species

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

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