SOME RELATIONSHIPS BETWEEN XEROPHYTISM AND THE CONTENT OF RESIN, NORDIHYDROGUAIARETIC ACID AND PROTEIN OF <i>LARREA DIVARICATA</i> CAV

Duisberg, Peter C.

doi:10.1104/pp.27.4.769

Cited by 14 publications

(2 citation statements)

References 11 publications

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“…Larrea does not have transpiration inhibition and loses available water very rapidly, but it has a very high level of protoplasmic tolerance or resistance to desiccation. This has been hypothesized in the past by Ashby (1932), Runyon (1934) and Duisberg (1952) and measured by Oechel et al (1972a). In the present study, Larrea maintained positive net photosynthesis at water potentials below -80 bars as determined with the pressure device.…”

Section: Discussionsupporting

confidence: 77%

The Effect of Decreasing Water Potential on Net CO2 Exchange of Intact Desert Shrubs

Odening¹,

Strain²,

Oechel³

1974

Ecology

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This study compares the effects of seasonal (in situ) and experimentally—induced drought on three desert shrubs of different growth types. The effect of decreasing water potential on CO2 uptake was used as the response indicating differences in desert adaptation. Larrea divaricata Cav., Encelia farinosa Gray, and Chilopsis linearis Cav. were selected as representing evergreen, drought—deciduous, and winter—deciduous species respectively. Field measurements of water potential and photosynthesis were made simultaneously on plants of all three species. Data were collected in the field at monthly or bimonthly intervals for a year. Additional experiments were conducted in a transplant garden and under controlled environments in a phytotron. Larrea has a high protoplasmic tolerance to drought stress and maintains net photosynthesis throughout extended periods of low water potential. The photosynthetically active period of Encelia is prolonged, and water loss reduced, by seasonal leaf variability and the drought deciduous habit. These phenomena permit a greater photosynthetic efficiency over a wider range of water potentials than would be possible with a single leaf type. Decreasing water potentials affect Chilopsis the most, but the presence of xeromorphic leaf tissue augments the phreatophytic habit in maintaining relatively high water potentials. A transpiration—retarding mechanism in Chilopsis is also hypothesized.

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Section: Discussionsupporting

confidence: 77%

The Effect of Decreasing Water Potential on Net CO2 Exchange of Intact Desert Shrubs

Odening¹,

Strain²,

Oechel³

1974

Ecology

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“…Although creosote bush is evergreen and produces new leaves throughout much of the year, the major annual pulse of productivity generally takes place in the spring (Barbour et al 1977). Duisberg (1952) determined that creosotebush foliage (new and old leaves) sampled in the spring was higher in nitrogen content and lower in resin and NDGA (chemical antiherbivore compounds, see the section following) than foliage sampled in the summer.…”

Section: Variation In Phytophagous Insects and Variable Creosotebush mentioning

confidence: 99%

Variation in Insect Densities on Desert Creosotebush: Is Nitrogen a Factor?

Lightfoot¹,

Whitford²

1987

Ecology

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A field experiment was conducted to assess the effects of nitrogen and water on the densities and taxonomic and trophic compositions of arthropods on the foilage of desert creosotebush (Larrea tridentata). Nitrogen and water were manipulated through a series of fertilizer and irrigation treatments applied to naturally growing creosotebush shrubs at a site in the northern Chihuahuan Desert. Water with nitrogen, and nitrogen fertilization alone, significantly increased creosotebush foliage production and foliar nitrogen contents. Water alone had less effect on foliage production and no effect on foliar nitrogen contents. Foliage production, foliar nitrogen contents, and numbers of foliage arthropods were all higher in the late spring than in the mid or late summer. Numbers of foliage arthropods increased significantly on fertilized plants in the late spring. Water treatments alone had no effect on numbers of foliage arthropods, but a positive water—fertilizer interaction effect on numbers of foliage arthropods was evident in the late spring. Overall, there were significant positive correlations between foliage production, foliar nitrogen contents, and foliage arthropod densities. Phytophagous sap—sucking insects accounted for the majority of arthropods on creosotebush, and their densities varied most in relation to foliage production and foliar nitrogen contents. Results of our study demonstrated that sap—sucking phytophagous insects are more responsive than leaf—chewing insects to increased nitrogen content of creosotebush foliage, and that much of the between—plant variation in densities of phytophagous insects within a stand of creosotebush may be due to sap—sucking insects tracking variable foliar nitrogen.

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Zygophyllaceae

Hegnauer¹

1973

Chemotaxonomie Der Pflanzen

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SOME RELATIONSHIPS BETWEEN XEROPHYTISM AND THE CONTENT OF RESIN, NORDIHYDROGUAIARETIC ACID AND PROTEIN OF LARREA DIVARICATA CAV

Cited by 14 publications

References 11 publications

The Effect of Decreasing Water Potential on Net CO2 Exchange of Intact Desert Shrubs

The Effect of Decreasing Water Potential on Net CO2 Exchange of Intact Desert Shrubs

Variation in Insect Densities on Desert Creosotebush: Is Nitrogen a Factor?

Zygophyllaceae

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