The Growth and Rubber Content of Guayule as Affected by Variations in Soil Moisture Stresses<sup>1</sup>

Hunter, Albert S.; Kelley, Omer J.

doi:10.2134/agronj1946.00021962003800020003x

Cited by 28 publications

(6 citation statements)

References 5 publications

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“…The samples for rubber determinations which provided the data for this study were harvested during the winter dormancy· period when the rubber content reaches its seasonal maximum (1, 15). However, from a consideration of the effect of various cultural practices on the rubber content of guayule (7,15) it is evident that the percentages given in Table 1 do not represent the maxima obtainable for 2-and 3-year old plants. Rubber percentages from replicated whole-plant samples of four commercial varieties grown under different cultural treatment in an adjacent variety test also established in 1943 were considerably higher than those for the branch samples of the same varieties in the experiments reported here.…”

Section: Methodsmentioning

confidence: 96%

High Rubber Yielding Selections from a Natural Population of Guayule¹

Johnson

1950

Agronomy Journal

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Section: Methodsmentioning

confidence: 96%

High Rubber Yielding Selections from a Natural Population of Guayule¹

Johnson

1950

Agronomy Journal

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“…This inverse relationship between plant growth and percent rubh~r. first observed by Hunter and Kelley ( 1946), 1031 suggests that a better understanding ofhow plant water status affects rubber production may provide crucial information for future breeding and management of guayule. The objectives of this study, therefore, were to characterize physiological traits related to plant water status to gain a better understanding of the processes that control drought tolerance in guayule, and to investigate the relationship between plant water status, plant growth, and rubber production during a prolonged drought period.…”

mentioning

confidence: 99%

Plant Water Relations, Photosynthesis, and Rubber Content of Young Guayule Plants during Water Stress¹

Allen¹,

Nakayama²,

Dierig³

et al. 1987

Agronomy Journal

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Guayule (Parthenium argentatum Gray, cv. N565 II), a drought tolerant, rubber‐producing shrub native to the desert Southwest, was grown in field plots at Phoenix, AZ, in an Avondale loam soil [fine, loamy, mixed (calcareous), hyperthermic Typic Torrifluvent] in well‐watered and drought conditions. The purpose of the investigation was to characterize the relationships between plant water relations, photosynthesis, and rubber content during drought stress to improve water management practices. The drought treatment lasted 70 days (29 May–5 Aug. 1986) during which the soil moisture content gradually declined from 340 to 165 mm in the top 1.1 m of soil. The well‐watered plots were maintained at greater than 260 mm soil moisture per 1.1 m of soil. Values for psychrometric measurement of water potential of the stressed plants declined to −3.0 MPa, 1.2 MPa less than the well‐watered plants, while maintaining approximately equal and positive pressure potential. This suggests an important role for osmotic adjustment in the drought tolerance of guayule. Net photosynthesis in both treatments steadily declined from about 10.0 to 3.5 µMol m−2 s−1 during the experiment, but with no apparent inhibition due to drought stress. Rubber content increased over fivefold in the stressed plants (from 0.4 to 2.1%) and doubled in the well‐watered plants (from 0.4 to 0.8%) over the course of the experiment. However, the stress treatment reduced final plant size, based on plant height and width measurements, by approximately one‐third compared to the well‐watered treatment. Controlled periods of stress should be investigated as a potential management tool to increase rubber content as well as reduce irrigation water requirements.

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“…Our understanding of the work does not indicate that such a conclusion is justi fied. Hunter and Kelley (1946) give the results of field irrigation studies on guayule. These experiments were carried on near Shafter and near Crows Landing in the San Joaquín Valley of California.…”

Section: Hilgaräiamentioning

confidence: 99%

“…Indeed it is remarkable that the plants in treatments IV and V grew so well under the severe moisture conditions to which they were subjected. Traub, Slattery, and McRary (1946) used samples of plants from the plots in the experiment of Hunter and Kelley (1946). These authors speak about high, intermediate, and low moisture stress, probably with the intent to indi cate that differences would occur within the plant if the soil moisture were maintained above different levels between field capacity and PWP.…”

Section: Hilgaräiamentioning

confidence: 99%

Responses of a plant to soil-moisture changes as shown by guayule

Veihmeyer¹,

Hendrickson²

1961

Hilg

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AVAILABILITY of soil moisture to plants has been widely discussed. Experi ments by the present writers have led to the conclusion that moisture is readily available to supply water for all plant functions so long as the moisture content of the soil that is in contact with the absorbing portion of the roots is not reduced to the permanent wilting percentage (PWP). Op posing opinions have argued that, theoretically, water cannot be readily available to plants over the range from field capacity to the P W P be cause of the excessive amount of energy required to remove water from soil that is near the PWP. Veihmeyer and Hendrickson (1950)* and Veihmeyer (1956) have shown that such is not the case. Lack of water for trans piration and others needs of the plant's growth, however, may result from slow movement of roots into moist soil from a region of dry soil. Also, changes may be induced within the plant by low soil-moisture conditions, and these may limit the plant's ability to absorb water. Whether the latter fac tors are limiting conditions in the uptake of water by the plants can only be answered satisfactorily by empirical trials. Reviews by Richards and Wadleigh (1952), Veihmeyer and Hendrickson (1950), and Veihmeyer (1956) present the main arguments as to whether or not soil moisture is readily available to plants throughout the range from field capacity to the PWP. The present study is confined to the responses of guayule (Parthenium argentatum) to different soil-moisture conditions. REVIEW O F THE LITERATURE Wadleigh, Gauch, and Magistad (1946) conducted experiments to determine the effect of salinity on plant responses. These workers used guayule plants grown in 10-gallon steel drums holding about 100 pounds of dry soil. Three

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The Growth and Rubber Content of Guayule as Affected by Variations in Soil Moisture Stresses¹

Cited by 28 publications

References 5 publications

High Rubber Yielding Selections from a Natural Population of Guayule¹

High Rubber Yielding Selections from a Natural Population of Guayule¹

Plant Water Relations, Photosynthesis, and Rubber Content of Young Guayule Plants during Water Stress¹

Responses of a plant to soil-moisture changes as shown by guayule

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The Growth and Rubber Content of Guayule as Affected by Variations in Soil Moisture Stresses1

Cited by 28 publications

References 5 publications

High Rubber Yielding Selections from a Natural Population of Guayule1

High Rubber Yielding Selections from a Natural Population of Guayule1

Plant Water Relations, Photosynthesis, and Rubber Content of Young Guayule Plants during Water Stress1

Responses of a plant to soil-moisture changes as shown by guayule

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Product

Resources

About

The Growth and Rubber Content of Guayule as Affected by Variations in Soil Moisture Stresses¹

High Rubber Yielding Selections from a Natural Population of Guayule¹

High Rubber Yielding Selections from a Natural Population of Guayule¹

Plant Water Relations, Photosynthesis, and Rubber Content of Young Guayule Plants during Water Stress¹