Transpiration and Physico-Chemical Properties of Leaves as Related to Drought Resistance in Loblolly Pine and Shortleaf Pine

Schopmeyer, C. S.

doi:10.1104/pp.14.3.447

Cited by 16 publications

(3 citation statements)

References 9 publications

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“…Loblolly, shortleaf, and hybrid pines stopped transpiring at the same soil moisture level, which does not support a hypothesis that shortleaf pine or hybrid pines are either: A) more isohydric, i.e., stops transpiring earlier to conserve water, or B) more anisohydric, i.e., continues to transpire (and gain carbon) to a lower soil moisture than loblolly pine. Schopmeyer (1939) came to a similar conclusion when comparing loblolly and shortleaf pine transpiration rates across well-watered and water-stressed treatments. While we found no differences, other species do show genetic differences in FTSW values at which transpiration declines.…”

Section: R a F Tsupporting

confidence: 58%

Comparison of biomass partitioning and transpiration for water-stressed shortleaf, loblolly, and shortleaf × loblolly pine hybrid seedlings

Bradley

Will

2017

Can. J. For. Res.

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Hybridization between shortleaf pine (Pinus echinata Mill.) and loblolly pine (Pinus taeda L.) has dramatically increased and may threaten the genetic integrity of shortleaf pine. Shortleaf pine is presumed to be more drought tolerant than loblolly pine, but the drought hardiness of the hybrid pine is not known. We determined biomass partitioning in response to water stress and measured whole-plant transpiration of shortleaf, loblolly, and hybrid pine seedlings. Water stress decreased total seedling biomass, increased biomass partitioning to foliage, and decreased biomass partitioning to coarse roots. Shortleaf pine seedlings partitioned more biomass to coarse roots than loblolly pine, and hybrid pine was intermediate between the parent species. We found no differences in the level of soil moisture at which seedlings of different species began to limit transpiration. Our results suggest that the transpiration response of shortleaf pine and hybrid pine is similar to that of loblolly pine when exposed to water stress. However, greater partitioning to coarse root may allow shortleaf and hybrid pines to better withstand drought due to greater potential belowground carbohydrate supply.

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Section: R a F Tsupporting

confidence: 58%

Comparison of biomass partitioning and transpiration for water-stressed shortleaf, loblolly, and shortleaf × loblolly pine hybrid seedlings

Bradley

Will

2017

Can. J. For. Res.

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“…T HE determination of the factors involved in the drought resistance of the more drought hardy species, such as barley as compared with wheat or oats, would be a significant contribution toward the understanding of drought resistance in crop plants. Since Maximov's rejection in 1917 (10) of the idea that drought hardy plants had low transpiration rates when supplied with adequate moisture, many others (13,14) have later supported his conclusions. Zohary ( 15), on the other hand, emphasized that plants growing under extreme drought show a very low transpiration intensity compared with less xeromorphic plants grown in the Mediterranean region.…”

mentioning

confidence: 99%

Transpiration Patterns of Wheat, Barley and Oat Seedlings Under Varying Conditions of Soil Moisture¹

Salim¹,

Todd²

1965

Agronomy Journal

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Synopsis Barley plants had the lowest transpiration rate and oats the highest under both greenhouse and growth chamber conditions. For all plants there was a linear relationship between soil moisture content and transpiration loss. Plants subjected to a single period of moisture stress showed a marked reduction in transpiration from the prestress rate. Water use efficiency was the same for the 3 genera in the growth chamber, but in the greenhouse barley had a much greater efficiency than wheat or oats.

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“…Some workers have repeatedly stated that water is equally available over this range (5,18,23,24) while considerable data have accumulated which indicate that physiological processes in plants are altered as a result of decreasing soil moisture content even before the onset of wilting (1,2,4,6,7,12,16,21,25). As indicated by KRAMER (15) some of this disagreement exists because of differences in soil moisture tensionsoil moisture content relations for different textural grades of soil.…”

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confidence: 97%

Availability of Soil Moisture for Active Absorption in Drying Soil

Army

Kozlowski

1951

Plant Physiol.

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There is considerable disagreement as to whether or not water is equally available to plants in drying soil over the entire range from field capacity to wilting percentage. Some workers have repeatedly stated that water is equally available over this range (5,18,23,24) while considerable data have accumulated which indicate that physiological processes in plants are altered as a result of decreasing soil moisture content even before the onset of wilting (1,2,4,6,7,12,16,21,25). As indicated by KRAMER (15) some of this disagreement exists because of differences in soil moisture tensionsoil moisture content relations for different textural grades of soil. In certain coarse-textured soils most of the water in the range from wilting percentage to field capacity is held with a tension of less than one atmosphere and probably most of it is readily available. In some fine-textured soils, however, less than half of the available water may be held with a force of less than one atmosphere, and water is withheld from plants with appreciably greater energy over the lower part of the available range than over the upper part. Near the wilting percentage a small decrease in moisture content effects an enormous increase in tension.Data also are available which indicate that active absorption and root pressure specifically are depressed by low soil moisture contents above the wilting percentage. LITVINOV and GEBHARDT (17) have reported a qualitative correlation between drying of soil and cessation of exudation from stumps of detopped plants. KRAMER (14) noted that removal of tops of unwilted herbaceous plants was not always followed by expected exudation. However, exudation usually began soon after the soil was watered. Working with coleus, sunflower and tomato, Kramer found that about 45%o of the soil moisture between the moisture equivalent and the wilting percentage was unavailable to detopped plants. He concluded that the active absorption mechanism does not absorb against a diffusion pressure deficit greater than one or two atmospheres. The proportion of moisture in the "available range" over which exudation does not take place was essentially similar for clay, sand, and sandy loam. The uniformity of the results obtained indicated that the soil moisture content which limits exudation is determined predominantly by soil characteristics and not by plant characteristics. Using sunflower plants and a uniform, fertile sandy loam, McDERMOTT (19) found that within a range of moisture content just above the wilting per-

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Transpiration and Physico-Chemical Properties of Leaves as Related to Drought Resistance in Loblolly Pine and Shortleaf Pine

Cited by 16 publications

References 9 publications

Comparison of biomass partitioning and transpiration for water-stressed shortleaf, loblolly, and shortleaf × loblolly pine hybrid seedlings

Comparison of biomass partitioning and transpiration for water-stressed shortleaf, loblolly, and shortleaf × loblolly pine hybrid seedlings

Transpiration Patterns of Wheat, Barley and Oat Seedlings Under Varying Conditions of Soil Moisture¹

Availability of Soil Moisture for Active Absorption in Drying Soil

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Transpiration and Physico-Chemical Properties of Leaves as Related to Drought Resistance in Loblolly Pine and Shortleaf Pine

Cited by 16 publications

References 9 publications

Comparison of biomass partitioning and transpiration for water-stressed shortleaf, loblolly, and shortleaf × loblolly pine hybrid seedlings

Comparison of biomass partitioning and transpiration for water-stressed shortleaf, loblolly, and shortleaf × loblolly pine hybrid seedlings

Transpiration Patterns of Wheat, Barley and Oat Seedlings Under Varying Conditions of Soil Moisture1

Availability of Soil Moisture for Active Absorption in Drying Soil

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Transpiration Patterns of Wheat, Barley and Oat Seedlings Under Varying Conditions of Soil Moisture¹